TITLE OF THE INVENTION
PRENYL-PROTEIN TRANSFERASE INHIBITORS
BACKGROUND OF THE INVENTION The Ras proteins (Ha-Ras, Ki4a-Ras, Ki4b-Ras and N-Ras) are part of a signalling pathway that links cell surface growth factor receptors to nuclear signals initiating cellular proliferation. Biological and biochemical studies of Ras action indicate that Ras functions like a G-regulatory protein. In the inactive state, Ras is bound to GDP. Upon growth factor receptor activation Ras is induced to exchange GDP for GTP and undergoes a conformational change. The GTP-bound form of Ras propagates the growth stimulatory signal until the signal is terminated by the intrinsic GTPase activity of Ras, which returns the protein to its inactive GDP bound form (D.R. Lowy and D.M. Willumsen, Ann. Rev. Biochem. 62:851-891 (1993)). Mutated ras genes Ha-ras, Ki4a-røs, Ki4h-ras and N-ras) are found in many human cancers, including colorectal carcinoma, exocrine pancreatic carcinoma, and myeloid leukemias. The protein products of these genes are defective in their GTPase activity and constitutively transmit a growth stimulatory signal.
Ras must be localized to the plasma membrane for both normal and oncogenic functions. At least 3 post-translational modifications are involved with Ras membrane localization, and all 3 modifications occur at the C-terminus of Ras.
The Ras C-terminus contains a sequence motif termed a "CAAX" or "Cys-Aaa -
Aaa -Xaa" box (Cys is cysteine, Aaa is an aliphatic amino acid, the Xaa is any amino acid) (Willumsen et al, Nature 570:583-586 (1984)). Depending on the specific sequence, this motif serves as a signal sequence for the enzymes prenyl-protein transferase or geranylgeranyl-protein transferase, which catalyze the alkylation of the cysteine residue of the CAAX motif with a C15 or C20 isoprenoid, respectively. (S. Clarke., Ann. Rev. Biochem. 61:355-386 (1992); W.R. Schafer and J. Rine, Ann. Rev. Genetics 30:209-237 (1992)). The term prenyl-protein transferase may be used to refer generally to farnesyl-protein transferase and geranylgeranyl-protein transferase type 1. The Ras protein is one of several proteins that are known to undergo post-
translational prenylation. Other prenylated proteins include the Ras-related GTP- binding proteins such as Rho, fungal mating factors, the nuclear lamins, and the gamma subunit of transducin. James, et al., J. Biol. Chem. 269, 14182 (1994), have identified a peroxisome associated protein Pxf which is also prenylated. These same authors have also suggested that there are prenylated proteins of unknown structure and function in addition to those listed above.
Inhibition of prenyl-protein transferase has been shown to block the growth of Ras-transformed cells in soft agar and to modify other aspects of their transformed phenotype. It has also been demonstrated that certain inhibitors of prenyl-protein transferase selectively block the processing of the Ras oncoprotein intracellularly (N.E. Kohl et al, Science, 260: 934-1937 (1993) and G.L. James et al, Science, 260:1937-1942 (1993)). Recently, it has been shown that an inhibitor of a prenyl-protein transferase blocks the growth of ras-dependent tumors in nude mice (N.E. Kohl et al, Proc. Natl. Acad. Sci U.S.A., 97:9141-9145 (1994)) and induces regression of mammary and salivary carcinomas in ras transgenic mice (N.E. Kohl et al, Nature Medicine, 1 :792-797 (1995)).
Indirect inhibition of prenyl-protein transferase in vivo has been demonstrated with lovastatin (Merck & Co., Rahway, NJ) and compactin (Hancock et al, ibid; Casey et al, ibid; Schafer et al, Science 245:319 (1989)). These drugs inhibit HMG-CoA reductase, the rate limiting enzyme for the production of polyiso- prenoids including prenyl pyrophosphates. Prenyl-protein transferases utilizes prenyl pyrophosphates to covalently modify the Cys thiol group of the Ras CAAX box with a prenyl group (Reiss et al. Cell, 62:81-88 (1990); Schaber et al, J. Biol. Chem., 265: 14701-14704 (1990); Schafer et al, Science, 249:1133-1139 (1990); Manne et al, Proc. Natl Acad. Sci USA, 57:7541-7545 (1990)). Inhibition of prenyl pyrophosphate biosynthesis by inhibiting HMG-CoA reductase blocks Ras membrane localization in cultured cells. However, direct inhibition of prenyl-protein transferases would be more specific and attended by fewer side effects than would occur with the required dose of a general inhibitor of isoprene biosynthesis.
Inhibitors of farnesyl-protein transferase (FPTase), a type of prenyl- protein transferase, have been described in two general classes. The first are analogs of farnesyl diphosphate (FPP), while the second class of inhibitors is related to the protein substrates (e.g., Ras) for the enzyme. The peptide derived inhibitors that have been described are generally cysteine containing molecules that are related to the CAAX motif that is the signal for protein farnesylation. (Schaber et al, ibid; Reiss et. al, ibid; Reiss et al, PNAS, 88:132-136 (1991)). Such inhibitors may inhibit proteinfarnesylation while serving as alternate substrates for the farnesyl- protein transferase enzyme, or may be purely competitive inhibitors (U.S. Patent 5,141,851, University of Texas; N.E. Kohl et al, Science, 260: 934-1937 (1993);
Graham, et al., J. Med. Chem., 37, 725 (1994)). In general, deletion of the thiol from a CAAX derivative has been shown to dramatically reduce the inhibitory potency of the compound. However, the thiol group potentially places limitations on the therapeutic application of FPTase inhibitors with respect to pharmacokinetics, pharmacodynamics and toxicity.
It has recently been reported that prenyl-protein transferase inhibitors are inhibitors of proliferation of vascular smooth muscle cells and are therefore useful in the prevention and therapy of arteriosclerosis and diabetic disturbance of blood vessels (JP H7- 112930). It has recently been disclosed that certain tricyclic compounds which optionally incorporate a piperidine moiety are inhibitors of FPTase (WO 95/10514, WO 95/10515 and WO 95/10516). Imidazole-containing inhibitors of farnesyl protein transferase have also been disclosed (WO 95/09001 and EP 0 675 112 Al). It is, therefore, an object of this invention to develop compounds that will inhibit prenyl-protein transferase and thus, the post-translational prenylation of proteins. It is a further object of this invention to develop chemotherapeutic compositions containing the compounds of this invention and methods for producing the compounds of this invention.
SUMMARY OF THE INVENTION
The present invention comprises compounds which inhibit prenyl- protein transferase. Further contained in this invention are chemotherapeutic compositions containing these prenyl transferase inhibitors and their methods of use.
The compounds of this invention are illustrated by Formula I:
I
DETAILED DESCRIPTION OF THE INVENTION
The compounds of this invention are useful in the inhibition of prenyl-protein transferase and the prenylation of the oncogene protein Ras. In a first embodiment of this invention, the inhibitors of prenyl-protein transferase are illustrated by a compound of Formula I or a pharmaceutically acceptable salt thereof:
wherein: a is O or 1; m is 0, 1 or 2; n is 0, 1 or 2; q is 1, 2, or 3;
r is 0, 1, 2, 3, 4 or 5; s is 1, 2, or 3; t is l or 2;
is selected from the following:
Rl is selected from H or C1-C6 alkyl;
R2 is selected from: 1) hydrogen,
2) aryl, said aryl optionally substituted with one or more substituents selected from R*,
3) heterocyclyl, said heterocyclyl optionally substituted with one or more substituents selected from R*, 4) C3-C 10 cycloalkyl,
5) C2-C6 alkenyl,
6) C2-C6 alkynyl,
7) OR8,
8) S(O)mR9,
9) Cl-C6 perfluoroalkyl,
10) CN,
1 1) halo,
12) C(O)NR6R7,
13) CO2R9,
14) NR6R7,
15) C1-C6 alkyl, wherein the alkyl may be optionally substituted with a substitutent selected from aryl, heterocyclyl, C3-C10 cycloalkyl,
C2-C6 alkenyl, C2-C6 akynyl, OR8, S(O)mR9, C1-C6 perfluoroalkyl,
CN, and halo, and
16) the two R2 on the same carbon are taken together to be oxo;
R3 is selected from:
1) Cl-8 alkyl, optionally substituted with R*,
2) C2-8 alkenyl, optionally substituted with R*,
3) C2-8 alkynyl, optionally substituted with R*,
4) aryl, optionally substituted with R*, except that R cannot be tetrazole substituted phenyl,
5) halo,
6) OR13,
7) NR14R15,
8) CN,
9) NO2,
10) C1-C6 perfluoroalkyl;
1 1) S(O)mR 3,
12) C(O)NR6R7,
13) C3-C6 cycloalkyl,
14) H, and
15) heterocyclyl, optionally substituted with R*;
R4 is selected from: 1) H, 2) (C=O)Oa(C l -C8)alkyl or (C l -Cs)alkyl, wherein the alkyl is optionally substituted with one or more groups selected from the following: a) OR8, b) S(O)mR9, c) C(O)NR6R7, d) CO2R9, e) aryl, optionally substituted with one or more substitutents chosen from OR8, S(O)mR9, C(O)NR6R7, CO2R9, aryl, halo, NR6R7> CN, NO2, F35 C3-C6 cycloalkyl, C1-C6 alkyl, and heterocyclyl, f) halo, g) NR6R7> h) CN, i) CF3, j) C3-C6 cycloalkyl, and k) heterocyclyl, optionally substituted with one or more substitutents chosen from OR8, S(O)mR9, C(O)NR6R7, CO2R9, aryl, halo,
NR6R7> CN, NO2, CF3, C3-C6 cycloalkyl, C1-C6 alkyl, and heterocyclyl, 3) C2-8 alkenyl, 4) C2-8 alkynyl,
5) aryl, optionally substituted with one or more substitutents chosen from OR8, S(O)mR9, C(O)NR6R7; CO2R9, aryl, halo, NR6R7> CN, NO2, CF3, C3-C6 cycloalkyl, Ci-Cβ alkyl, and heterocyclyl,
6) heteroaryl, optionally substituted with one or more substitutents chosen from OR8, S(O)mR9, C(O)NR6R7,
CO2R9, aryl, halo, NR6R7> CN, NO2, CF3, C3-C6 cycloalkyl, C -C6 alkyl, and heterocyclyl, i ) aWfrnp ,
8) C(O)NR6R7,
9) C(O)aryl, and
10) CO2aryl;
R^a is selected from:
1) H,
2) Ci-8 alkyl,
3) C2-8 alkenyl,
4) C2-8 alkynyl,
5) aryl,
6) heterocyclyl,
7) halo,
8) OR8,
9) S(O)mR9,
10) C(O)NR6R7,
11) C(O)R9and
12) CO2R9;
R5 is selected from:
1) Cl-8 alkyl, optionally substituted with R*,
2) C2-8 alkenyl, optionally substituted with R*,
3) C2-8 alkynyl, optionally substituted with R*,
4) aryl, optionally substituted with R*,
5) halo,
6) OR8,
7) NR6R7>
8) CN,
9) NO2,
■ 10) C1-C6 perfluoroalkyl ;
11) S(O)mR9,
12) C(O)NR6R7,
13) C3-C6 cycloalkyl,
14) H,
15) CO2R9, and
16) heterocyclyl, optionally substituted with R*;
and R7 are independently selected from:
1) H,
2) Cl-6 alkyl,
3) C3-6 cycloalkyl,
4) heterocyclyl,
5) aryl,
6) heteroaroyl,
7) arylsulfonyl,
8) heteroarylsulfonyl,
9) C(O)R9,
10) CO2R9' and
1 1) (Ci-C3)alkylaryl, or
R" and R7 are taken together with the nitrogen to which they are attached to form:
R8 is selected from:
1) hydrogen,
2) Cι-C6 alkyl,
3) benzyl, and
4) aryl;
R9 is selected from C1-C6 alkyl and aryl;
12 is selected from:
1) H,
2) Cl-6 alkyl, optionally substituted with one to four fluorines,
3) C2-6 alkenyl,
4) C2-6 alkynyl, and
5) aryl;
R 3 is selected from:
1 ) hydrogen, unless R3 is S(O)mR 3,
2) C1-C6 alkyl,
3) benzyl, and 4) aryl or heteroaryl , optionally substituted with: a) Cl-8 alkyl, optionally substituted with R*, b) C2-8 alkenyl, optionally substituted with R*,
c) C2-8 alkynyl, optionally substituted with R* d) halo, e) OR
8, f) NR
6R
7> g) CN, h) NO
2, i) C1-C perfluoroalkyl
; j) S(O)
mR9, k) S(O)
m NR6R
7,
m) C(O)NR6R
7, n) C3-C6 cycloalkyl, or o) heterocyclyl;
Rl4 and Rl 5 are independently selected from:
1 ) Cl-8 alkyl, optionally substituted with R*,
2) C2-8 alkenyl, optionally substituted with R*,
3) C2-8 alkynyl, optionally substituted with R*,
4) aryl or heteroaryl , optionally substituted with: a) Cl-8 alkyl, optionally substituted with R*, b) C2-8 alkenyl, optionally substituted with R*, c) C2-8 alkynyl, optionally substituted with R*, d) halo, e) OR8, f) NR6R7> g) CN, h) NO2, i) Cι-C6 perfluoroalkyl5
j) S(O)mR9, k) S(O)m NR6R7 ;
m) C(O)NR
6R
7, n) C3-C6 cycloalkyl, or o) heterocyclyl
5) H,
6) S(O)mR9,
7) heteroarylsulfonyl,
8) heteroaroyl,
9) heterocyclyl,
10) C3-6 cycloalkyl,
11) C(O)R9, and
12) CO2R9;
A is O, -S(O)m-, NR4, -NR4(CO)-, -NR4(CO)O-, -O(CO)-, -O(CO)O- -(CO)NR4-, -O(CO)NR4-, or
is selected from aryl, heterocyclyl, and a bond;
is selected from aryl and heteroaryl; and R* is 1) CO2R
9,
2) Ci-6 alkyl,
3) NR6R7,
4) C3-6 cycloalkyl,
5) aryl or heterocyclyl,
6) OR8,
7) S(O)mR9,
8) C(O)NR6R7,
9) halo,
10) Ci-3 perfluoroalkyl,
11) CN,
12) NO2, or
13) COR9.
Another embodiment of the present invention is the compound of Formula I, wherein
and all other variables and substitutents are as described above.
And yet another embodiment of the invention is the compound of Formula I, wherein
is phenyl and all other variables and substituents are as described above.
A fourth embodiment of the invention is exemplified by a compound of Formula I, wherein Rl is H or methyl; and A is -NR
4, -NR
4(CO)-, -NR
4(CO)O-, or
where G is O or H2-
A fifth embodiment of the invention is a compound of Formula II or a pharmaceutically acceptable salt thereof:
II wherein: a is O or 1 ; m is 0, 1 or 2;
Rl is H or methyl;
R3 is selected from:
1) Ci-6 alkyl,
2) C2-6 alkenyl,
3) C2-6 alkynyl,
4) aryl,
5) halo,
6) OR9,
7) NR14R15,
8) CN,
9) NO2,
10) Ci-Cό perfluoroalkyl,
11) S(O)mRl0,
12) C(O)NR6R7,
13) C3-C6 cycloalkyl,
14) H, and
15) heterocyclyl;
Ra and Rb are independently selected from:
1) H,
2) (CO)Oa(C 1 -C6)alkyl or (C 1 -C6)alkyl, wherein the alkyl is optionally substituted with one or more groups selected from the following: a) OR9, b) S(O)mRl0, c) C(O)NR6R7, d) C(O)ORl°, e) aryl, optionally substituted with one or more substitutents chosen from R5, f) halo, g) NR6R7> h) CN, i) CF3, j) C3-C6 cycloalkyl, and k) heterocyclyl, optionally substituted with one or more substitutents chosen from R5,
3) aryl, optionally substituted with one, two or three substitutents chosen from R5,
4) heteroaryl, optionally substituted with one, two or three substitutents chosen from R5, or
Ra and Rb are taken together along with the nitrogen to which they are attached to form
R4a is selected from:
1) H,
2) Ci-8 alkyl,
3) C2-8 alkenyl,
4) C2-8 alkynyl,
5) aryl,
6) heterocyclyl,
7) halo,
8) C(O)NR6R7,
9) C(O)Rl° and
10) CO2R10;
R5 is selected from:
1) OR9,
2) S(O)mRl0,
3) C(O)NR6R7,
4) CO2R10,
5) aryl,
6) halo,
7) NR6R7,
8) CN,
9) NO2,
10) CF3)
11) C3-C cycloalkyl,
12) C1-C alkyl, and
13) heterocyclyl;
R6 and R7 are independently selected from: 1) H,
2) Cl-6 alkyl,
3) C3-6 cycloalkyl,
4) heterocyclyl,
5) aryl, 6) heteroaroyl,
7) arylsulfonyl,
8) heteroarylsulfonyl,
9) C(O)Rl°,
10) CO2R10> and 11) (Ci-C3)alkylaryl, or
R6 and R are taken together with the nitrogen to which they are attached to form:
Rc is aryl, optionally substituted with one, two or three substituents chosen from R5;
R9 is selected from:
1) hydrogen,
2) C1-C6 alkyl,
3) benzyl, and
4) aryl; and
RIO is selected from C -C alkyl and aryl.
And yet a further embodiment of the present invention is a compound of Formula III
III
wherein
Rl _Ω_
CH3 NH(CH2CH2CHPh2)
CH3 N(CH2CH2CHPh2)(CH2CH2CH2Ph)
CH3 N(H)(CH(Ph)(CH2CH2Ph))
CH3 NH(CH2CH2CH2Ph)
CH3 NH(CH2CH2CH2CH;
CH3 NH(CO)OCH2Ph
CH3 NH(CO)CH2CHPh2
A preferred embodiment is where Y is aryl. A most preferred embodiment is where Y is phenyl. Another preferred embodiment is where at least one R3 is present and is CN. A preferred embodiment is where n=l , p=0 and X is N. Another preferred embodiment of the invention is where Rl is methyl or H. And yet
another preferred embodiment is where A is -NR4 ; -NR4(CO)-, -NR4(CO)O-, or
R4
— N N —
G , where G is O.
Also within the scope of the present invention is a pharmaceutical composition comprising a pharmaceutical carrier and a compound as described above. The invention further encompasses a method for inhibiting prenyl-protein transferase which comprises administering to a mammal in need thereof a therapeutically effective amount of a compound as described above. Also disclosed and claimed herein is a method for treating cancer which comprises administering to a mammal in need thereof a therapeutically effective amount of a compound as described above. The invention further includes a method for treating neurofibromin benign proliferative disorder which comprises administering to a mammal in need thereof a therapeutically effective amount of the disclosed compounds and a method for treating blindness related to retinal vascularization which comprises administering to a mammal in need thereof a therapeutically effective amount of the disclosed compounds.
Also disclosed and claimed is a method for treating infections from hepatitis delta and related viruses which comprises administering to a mammal in need thereof a therapeutically effective amount of the disclosed compounds and a method for preventing restenosis which comprises administering to a mammal in need thereof a therapeutically effective amount of the disclosed compounds.
Another embodiment of the disclosed invention is a method for treating polycystic kidney disease which comprises administering to a mammal in need thereof a therapeutically effective amount of the disclosed compounds. A further embodiment is a method of conferring radiation sensitivity on a tumor cell which comprises administering to a mammal in need thereof a therapeutically effective amount of a disclosed compound in combination with radiation therapy. And yet another embodiment of the present invention is a method
for treating cancer which comprises administering to a mammal in need thereof a therapeutically effective amount of a disclosed compound in combination with an antineoplastic and the method wherein the antineoplastic is paclitaxel.
The compounds of the present invention may have asymmetric centers and occur as racemates, racemic mixtures, and as individual diastereomers, with all possible isomers, including optical isomers, being included in the present invention.
When any variable (e.g. aryl, heterocycle, Rl, R etc.) occurs more than one time in any constituent, its definition on each occurrence is independent at every other occurrence. Also, combinations of substituents/or variables are permissible only if such combinations result in stable compounds. For example, (CR2)2 may be any of the following if R is defined as H, CH3, or OH: CH2C(OH)(CH3), CH(OH)CH(OH), CH(OH)CH(CH3), C(CH3)2C(OH)(CH3), C(CH3)2C(CH3)2, C(CH3)2CH2, etc. Similarly,
can be any of the following if R is defined as alkyl or halo and q is 1 or 2:
As used herein, "alkyl" is intended to include both branched and straight-chain saturated aliphatic hydrocarbon groups having the specified number of carbon atoms. For example, Cl-8, as in Ci-8alkyl is defined to identify the group as having 1, 2, 3, 4, 5, 6, 7 or 8 carbons in a linear or branched aπangement, such that Ci-8alkyl specifically includes methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl and octyl. "Alkoxy" represents an alkyl group of indicated number of carbon atoms attached through an oxygen bridge. "Halogen" or "halo" as used herein means fluoro, chloro, bromo and iodo. Cycloalkyl refers to a cyclic or bicyclic saturated chain of
three to ten carbons. Examples of cycloalkyls are cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, tetrahydro-naphthalene, etc.
If no number of carbon atoms is specified, the term "alkenyl" refers to a non-aromatic hydrocarbon radical, straight, branched or cyclic, containing from 2 to 10 carbon atoms and at least one carbon to carbon double bond. Preferably one carbon to carbon double bond is present, and up to four non-aromatic carbon-carbon double bonds may be present. Thus, "C2-C alkenyl" means an alkenyl radical having from 2 to 6 carbom atoms. Prefeπed alkenyl groups include ethenyl, propenyl, butenyl and cyclohexenyl. As described above with respect to alkyl, the straight, branched or cyclic portion of the alkenyl group may contain double bonds and may be substituted if a substituted alkenyl group is indicated.
The term "alkynyl" refers to a hydrocarbon radical straight, branched or cyclic, containing from 2 to 10 carbon atoms and at least one carbon to carbon triple bond. Up to three carbon-carbon triple bonds may be present. Thus, "C2-C6 alkynyl" means an alkynyl radical having from 2 to 6 carbom atoms. Prefeπed alkynyl groups include ethynyl, propynyl and butynyl. As described above with respect to alkyl, the straight, branched or cyclic portion of the alkynyl group may contain triple bonds and may be substituted if a substituted alkynyl group is indicated. As used herein, "aryl" is intended to mean any stable monocyclic or bicyclic carbon ring of up to 7 members in each ring, wherein at least one ring is aromatic. Examples of such aryl elements include phenyl, naphthyl, tetrahydro- naphthyl, indanyl, biphenyl, phenanthryl, anthryl or acenaphthyl.
The term heteroaryl, as used herein, represents, a 5- to 7-membered aromatic heterocycle containing from 1 to 4 heteroatoms selected from the group consisting of O, N and S, and includes any bicyclic group in which any of the above- defined heteroaryl rings is fused to a benzene ring. Heteroaryl groups within the scope of this definition include but are not limited to: acridinyl, carbazolyl, cinnolinyl, quinoxalinyl, pyπazolyl, indolyl, benzotriazolyl, furanyl, thienyl, benzothienyl, benzofuranyl, quinolinyl, isoquinolinyl, pyrazinyl, pyridazinyl, pyridinyl, pyrimidinyl, and pyrrolyl.
As appreciated by those of skill in the art, "halo" or "halogen" as used herein is intended to include chloro, fluoro, bromo and iodo. The term "heterocycle" or "heterocyclyl" as used herein is intended to mean a 5- to 10-membered aromatic or nonaromatic heterocycle containing from 1 to 4 heteroatoms selected from the group consisting of O, N and S, and includes bicyclic groups. Examples of heterocyclyl are the above mentioned heteroaryls as well as the following: benzoimidazolyl, benzofuranyl, benzofurazanyl, benzopyrazolyl, benzotriazolyl, benzothiophenyl, benzoxazolyl, carbazolyl, carbolinyl, cinnolinyl, furanyl, imidazolyl, indolinyl, indolyl, indolazinyl, indazolyl, isobenzofuranyl, isoindolyl, isoquinolyl, isothiazolyl, isoxazolyl, naphthpyridinyl, oxadiazolyl, oxazolyl, oxetanyl, pyranyl, pyrazinyl, pyrazolyl, pyridazinyl, pyridopyridinyl, pyridazinyl, pyridyl, pyrimidyl, pyrrolyl, quinazolinyl, quinolyl, quinoxalinyl, tetrahydropyranyl, tetrazolyl, tetrazolopyridyl, thiadiazolyl, thiazolyl, thienyl, triazolyl, azetidinyl, 1 ,4-dioxanyl, hexahydroazepinyl, piperazinyl, piperidinyl, pyπolidinyl, mo holinyl, thiomoφholinyl, dihydrobenzoimidazolyl, dihydrobenzofuranyl, dihydrobenzothiophenyl, dihydrobenzoxazolyl, dihydrofuranyl, dihydroimidazolyl, dihydroindolyl, dihydroisooxazolyl, dihydroisothiazolyl, dihydrooxadiazolyl, dihydrooxazolyl, dihydropyrazinyl, dihydropyrazolyl, dihydropyridinyl, dihydropyrimidinyl, dihydropyrrolyl, dihydroquinolinyl, dihydrotetrazolyl, dihydrothiadiazolyl, dihydrothiazolyl, dihydrothienyl, dihydrotriazolyl, dihydroazetidinyl, methylenedioxybenzoyl, tetrahydrofuranyl, and tetrahydrothienyl, and N-oxides thereof.
Lines drawn into the ring systems from substituents (such as from
Rl, R , R3, R4
etc.) indicate that the indicated bond may be attached to any of the substitutable ring carbon atoms. If the ring system is polycyclic, it is intended that the bond be attached to any of the suitable carbon atoms on the proximal ring only. For example,
can be any of the following:
It is understood that substituents and substitution patterns on the compounds of the instant invention can be selected by one of ordinary skill in the art to provide compounds that are chemically stable and that can be readily synthesized by techniques known in the art, as well as those methods set forth below, from readily available starting materials.
The pharmaceutically acceptable salts of the compounds of this invention include the conventional non-toxic salts of the compounds of this invention as formed, e.g., from non-toxic inorganic or organic acids. For example, such conventional non-toxic salts include those derived from inorganic acids such as hydrochloric, hydrobromic, sulfuric, sulfamic, phosphoric, nitric and the like: and the salts prepared from organic acids such as acetic, propionic, succinic, glycolic, stearic, lactic, malic, tartaric, citric, ascorbic, pamoic, maleic, hydroxymaleic, phenylacetic, glutamic, benzoic, salicylic, sulfanilic, 2-acetoxy-benzoic, fumaric, toluenesulfonic, methanesulfonic, ethane disulfonic, oxalic, isethionic, trifluoroacetic and the like. The pharmaceutically acceptable salts of the compounds of this invention can be synthesized from the compounds of this invention which contain a basic moiety by conventional chemical methods. Generally, the salts are prepared either by ion exchange chromatography or by reacting the free base with stoichio-
metric amounts or with an excess of the desired salt-forming inorganic or organic acid in a suitable solvent or various combinations of solvents.
The compounds of this invention may be prepared by employing reactions as shown in Schemes 1-5, in addition to other standard manipulations as are known in the literature or exemplified in the experimental procedures. Substituent numbering as shown in the Schemes do not necessarily correlate to that used in the claims.
As shown in Schemes 1-3, the tetrahydro-imidazopyridinyl compounds can be arrived at via standard synthetic transformations from readily available starting materials.
SCHEME 1
1 ,2-dichlorobenzene 4A molecular sieves
reflux
SCHEME 3
Schemes 4 and 5 exemplify a possible synthetic protocol that may be used to prepare the tetrahydro-isoquinilone analogs of the claimed compounds.
SCHEME 4
SCHEME 5
UTILITY
In a preferred embodiment of the instant invention the compounds of the invention are selective inhibitors of farnesyl-protein transferase. A compound is considered a selective inhibitor of farnesyl-protein transferase, for example, when its in vitro farnesyl-protein transferase inhibitory activity, as assessed by the assay described in Assay 1, is at least 100 times greater than the in vitro activity of the same compound against geranylgeranyl-protein transferase-type I in the assay described in Assay 2. Preferably, a selective compound exhibits at least 1000 times greater activity against one of the enzymatic activities when comparing geranylgeranyl-protein transferase-type I inhibition and farnesyl-protein transferase inhibition.
It is also preferred that the selective inhibitor of farnesyl-protein transferase is further characterized by: a) an IC50 (a measure of in vitro inhibitory activity) for inhibition of the prenylation of newly synthesized K-Ras protein more than about 100-fold higher than the EC50 °r tne inhibition of the farnesylation of hDJ protein.
When measuring such IC50S and EC50S the assays described in Assay 6 may be utilized.
It is also prefeπed that the selective inhibitor of farnesyl-protein transferase is further characterized by: b) an IC50 (a measurement of in vitro inhibitory activity) for inhibition of K4B-
Ras dependent activation of MAP kinases in cells at least 100-fold greater than the IC50 for inhibition of the farnesylation of the protein hDJ in cells.
It is also prefeπed that the selective inhibitor of farnesyl-protein transferase is further characterized by: c) an IC50 (a measurement of in vitro inhibitory activity) against H-Ras dependent activation of MAP kinases in cells at least 1000 fold lower than the inhibitory activity (IC50) against H-ras-CVLL (SEQ.ID.NO.: 1) dependent activation of MAP kinases in cells. When measuring Ras dependent activation of MAP kinases in cells the assays described in Assay 5 may be utilized.
In another preferred embodiment of the instant invention the compounds of the invention are dual inhibitors of farnesyl-protein transferase and geranylgeranyl-protein transferase type I. Such a dual inhibitor may be termed a Class II prenyl-protein transferase inhibitor and will exhibit certain characteristics when assessed in in vitro assays, which are dependent on the type of assay employed.
In a SEAP assay, such as described in Assay 5, it is prefeπed that the dual inhibitor compound has an in vitro inhibitory activity (IC50) that is less than about 12 mM against K4B-Ras dependent activation of MAP kinases in cells. The Class JJ prenyl-protein transferase inhibitor may also be characterized by: a) an IC50 (a measurement of in vitro inhibitory activity) for inhibiting K4B-Ras dependent activation of MAP kinases in cells between 0.1 and 100 times the IC50 for inhibiting the farnesylation of the protein hDJ in cells; and
b) an IC50 (a measurement of in vitro inhibitory activity) for inhibiting K4B-Ras dependent activation of MAP kinases in cells greater than 5-fold lower than the inhibitory activity (IC50) against expression of the SEAP protein in cells transfected with the pCMV-SEAP plasmid that constitutively expresses the SEAP protein.
The Class II prenyl-protein transferase inhibitor may also be characterized by: a) an IC50 (a measurement of in vitro inhibitory activity) against H-Ras dependent activation of MAP kinases in cells greater than 2 fold lower but less than 20,000 fold lower than the inhibitory activity (IC50) against H-rαs-CVLL
(SEQ.ID.NO.: 1) dependent activation of MAP kinases in cells; and b) an IC50 (a measurement of in vitro inhibitory activity) against H-rαs-CVLL dependent activation of MAP kinases in cells greater than 5-fold lower than the inhibitory activity (IC50) against expression of the SEAP protein in cells transfected with the pCMV-SEAP plasmid that constitutively expresses the
SEAP protein.
The Class II prenyl-protein transferase inhibitor may also be characterized by: a) an IC50 (a measurement of in vitro inhibitory activity) against H-Ras dependent activation of MAP kinases in cells greater than 10- fold lower but less than 2,500 fold lower than the inhibitory activity (IC50) against H-rαs- CVLL (SEQ.ID.NO.: 1) dependent activation of MAP kinases in cells; and b) an IC50 (a measurement of in vitro inhibitory activity) against H-rαs-CVLL dependent activation of MAP kinases in cells greater than 5 fold lower than the inhibitory activity (IC50) against expression of the SEAP protein in cells transfected with the pCMV-SEAP plasmid that constitutively expresses the SEAP protein.
A method for measuring the activity of the inhibitors of prenyl-protein transferase, as well as the instant combination compositions, utilized in the instant
methods against Ras dependent activation of MAP kinases in cells is described in Assay 5.
In yet another embodiment, a compound of the instant invention may be a more potent inhibitor of geranylgeranyl-protein transferase-type I than it is an inhibitor of farnesyl-protein transferase.
The instant compounds are useful as pharmaceutical agents for mammals, especially for humans. These compounds may be administered to patients for use in the treatment of cancer. Examples of the type of cancer which may be treated with the compounds of this invention include, but are not limited to, colorectal carcinoma, exocrine pancreatic carcinoma, myeloid leukemias and neurological tumors. Such tumors may arise by mutations in the ras genes themselves, mutations in the proteins that can regulate Ras activity (i.e., neurofibromin (NF-1), neu, src, abl, lck, fyn) or by other mechanisms.
The compounds of the instant invention inhibit farnesyl-protein transferase and the farnesylation of the oncogene protein Ras. The instant compounds may also inhibit tumor angiogenesis, thereby affecting the growth of tumors (J. Rak et al. Cancer Research, 55: 4575-4580 (1995)). Such anti-angiogenesis properties of the instant compounds may also be useful in the treatment of certain forms of vision deficit related to retinal vascularization. The compounds of this invention are also useful for inhibiting other proliferative diseases, both benign and malignant, wherein Ras proteins are aberrantly activated as a result of oncogenic mutation in other genes (i.e., the Ras gene itself is not activated by mutation to an oncogenic form) with said inhibition being accomplished by the administration of an effective amount of the compounds of the invention to a mammal in need of such treatment. For example, a component of NF-1 is a benign proliferative disorder.
The instant compounds may also be useful in the treatment of certain viral infections, in particular in the treatment of hepatitis delta and related viruses (J.S. Glenn et al. Science, 256:1331-1333 (1992).
The compounds of the instant invention are also useful in the prevention of restenosis after percutaneous transluminal coronary angioplasty by inhibiting neointimal formation (C. Indolfϊ et al. Nature medicine, 1 :541-545(1995). The instant compounds may also be useful in the treatment and prevention of polycystic kidney disease (D.L. Schaffher et al. American Journal of Pathology, 142:1051-1060 (1993) and B. Cowley, Jr. et al.FASEB Journal, 2:A3160 (1988)).
The instant compounds may also be useful for the treatment of fungal infections. The instant compounds may also be useful as inhibitors of proliferation of vascular smooth muscle cells and therefore useful in the prevention and therapy of arteriosclerosis and diabetic vascular pathologies.
The compounds of this invention may be administered to mammals, preferably humans, either alone or, preferably, in combination with pharmaceutically acceptable carriers, excipients or diluents, in a pharmaceutical composition, according to standard pharmaceutical practice. The compounds can be administered orally or parenterally, including the intravenous, intramuscular, intraperitoneal, subcutaneous, rectal and topical routes of administration.
The pharmaceutical compositions containing the active ingredient may be in a form suitable for oral use, for example, as tablets, troches, lozenges, aqueous or oily suspensions, dispersible powders or granules, emulsions, hard or soft capsules, or syrups or elixirs. Compositions intended for oral use may be prepared according to any method known to the art for the manufacture of pharmaceutical compositions and such compositions may contain one or more agents selected from the group consisting of sweetening agents, flavoring agents, coloring agents and preserving agents in order to provide pharmaceutically elegant and palatable preparations. Tablets contain the active ingredient in admixture with non-toxic pharmaceutically acceptable excipients which are suitable for the manufacture of tablets. These excipients may be for example, inert diluents, such as calcium carbonate, sodium carbonate, lactose, calcium phosphate or sodium phosphate; granulating and disintegrating agents, for example, microcrystalline cellulose, sodium crosscarmellose, corn starch, or alginic
acid; binding agents, for example starch, gelatin, polyvinyl-pyπolidone or acacia, and lubricating agents, for example, magnesium stearate, stearic acid or talc. The tablets may be uncoated or they may be coated by known techniques to mask the unpleasant taste of the drug or delay disintegration and absoφtion in the gastrointestinal tract and thereby provide a sustained action over a longer period. For example, a water soluble taste masking material such as hydroxypropylmethylcellulose or hydroxypropyl- cellulose, or a time delay material such as ethyl cellulose, cellulose acetate buryrate may be employed.
Formulations for oral use may also be presented as hard gelatin capsules wherein the active ingredient is mixed with an inert solid diluent, for example, calcium carbonate, calcium phosphate or kaolin, or as soft gelatin capsules wherein the active ingredient is mixed with water soluble carrier such as polyethyleneglycol or an oil medium, for example peanut oil, liquid paraffin, or olive oil. Aqueous suspensions contain the active material in admixture with excipients suitable for the manufacture of aqueous suspensions. Such excipients are suspending agents, for example sodium carboxymethylcellulose, methylcellulose, hydroxypropylmethyl-cellulose, sodium alginate, polyvinyl-pyπolidone, gum tragacanth and gum acacia; dispersing or wetting agents may be a naturally-occurring phosphatide, for example lecithin, or condensation products of an alkylene oxide with fatty acids, for example polyoxyethylene stearate, or condensation products of ethylene oxide with long chain aliphatic alcohols, for example heptadecaethylene- oxycetanol, or condensation products of ethylene oxide with partial esters derived from fatty acids and a hexitol such as polyoxyethylene sorbitol monooleate, or condensation products of ethylene oxide with partial esters derived from fatty acids and hexitol anhydrides, for example polyethylene sorbitan monooleate. The aqueous suspensions may also contain one or more preservatives, for example ethyl, or n-propyl p-hydroxybenzoate, one or more coloring agents, one or more flavoring agents, and one or more sweetening agents, such as sucrose, saccharin or aspartame.
Oily suspensions may be formulated by suspending the active ingredient in a vegetable oil, for example arachis oil, olive oil, sesame oil or coconut oil, or in mineral oil such as liquid paraffin. The oily suspensions may contain a thickening agent, for example beeswax, hard paraffin or cetyl alcohol. Sweetening agents such as those set forth above, and flavoring agents may be added to provide a palatable oral preparation. These compositions may be preserved by the addition of an anti-oxidant such as butylated hydroxyanisol or alpha-tocopherol.
Dispersible powders and granules suitable for preparation of an aqueous suspension by the addition of water provide the active ingredient in admixture with a dispersing or wetting agent, suspending agent and one or more preservatives. Suitable dispersing or wetting agents and suspending agents are exemplified by those already mentioned above. Additional excipients, for example sweetening, flavoring and coloring agents, may also be present. These compositions may be preserved by the addition of an anti-oxidant such as ascorbic acid. The pharmaceutical compositions of the invention may also be in the form of an oil-in-water emulsions. The oily phase may be a vegetable oil, for example olive oil or arachis oil, or a mineral oil, for example liquid paraffin or mixtures of these. Suitable emulsifying agents may be naturally-occurring phosphatides, for example soy bean lecithin, and esters or partial esters derived from fatty acids and hexitol anhydrides, for example sorbitan monooleate, and condensation products of the said partial esters with ethylene oxide, for example polyoxyethylene sorbitan monooleate. The emulsions may also contain sweetening, flavouring agents, preservatives and antioxidants.
Syrups and elixirs may be formulated with sweetening agents, for example glycerol, propylene glycol, sorbitol or sucrose. Such formulations may also contain a demulcent, a preservative, flavoring and coloring agents and antioxidant.
The pharmaceutical compositions may be in the form of a sterile injectable aqueous solutions. Among the acceptable vehicles and solvents that may be employed are water, Ringer's solution and isotonic sodium chloride solution.
The sterile injectable preparation may also be a sterile injectable oil-in- water microemulsion where the active ingredient is dissolved in the oily phase. For example, the active ingredient may be first dissolved in a mixture of soybean oil and lecithin. The oil solution then introduced into a water and glycerol mixture and processed to form a microemulation.
The injectable solutions or microemulsions may be introduced into a patient's blood-stream by local bolus injection. Alternatively, it may be advantageous to administer the solution or microemulsion in such a way as to maintain a constant circulating concentration of the instant compound. In order to maintain such a constant concentration, a continuous intravenous delivery device may be utilized. An example of such a device is the Deltec CADD-PLUS™ model 5400 intravenous pump.
The pharmaceutical compositions may be in the form of a sterile injectable aqueous or oleagenous suspension for intramuscular and subcutaneous administration. This suspension may be formulated according to the known art using those suitable dispersing or wetting agents and suspending agents which have been mentioned above. The sterile injectable preparation may also be a sterile injectable solution or suspension in a non-toxic parenterally-acceptable diluent or solvent, for example as a solution in 1,3-butane diol. In addition, sterile, fixed oils are conventionally employed as a solvent or suspending medium. For this purpose any bland fixed oil may be employed including synthetic mono- or diglycerides. In addition, fatty acids such as oleic acid find use in the preparation of injectables.
Compounds of Formula I may also be administered in the form of a suppositories for rectal administration of the drug. These compositions can be prepared by mixing the drug with a suitable non-irritating excipient which is solid at ordinary temperatures but liquid at the rectal temperature and will therefore melt in the rectum to release the drug. Such materials include cocoa butter, glycerin- ated gelatin, hydrogenated vegetable oils, mixtures of polyethylene glycols of various molecular weights and fatty acid esters of polyethylene glycol.
For topical use, creams, ointments, jellies, solutions or suspensions, etc., containing the compound of Formula A are employed. (For purposes of this application, topical application shall include mouth washes and gargles.)
The compounds for the present invention can be administered in intranasal form via topical use of suitable intranasal vehicles and delivery devices, or via transdermal routes, using those forms of transdermal skin patches well known to those of ordinary skill in the art. To be administered in the form of a transdermal delivery system, the dosage administration will, of course, be continuous rather than intermittent throughout the dosage regimen. As used herein, the term "composition" is intended to encompass a product comprising the specified ingredients in the specific amounts, as well as any product which results, directly or indirectly, from combination of the specific ingredients in the specified amounts.
When a compound according to this invention is administered into a human subject, the daily dosage will normally be determined by the prescribing physician with the dosage generally varying according to the age, weight, sex and response of the individual patient, as well as the severity of the patient's symptoms.
In one exemplary application, a suitable amount of compound is administered to a mammal undergoing treatment for cancer. Administration occurs in an amount between about 0.1 mg/kg of body weight to about 60 mg/kg of body weight per day, preferably of between 0.5 mg/kg of body weight to about 40 mg/kg of body weight per day.
The compounds of the instant invention may also be co-administered with other well known therapeutic agents that are selected for their particular usefulness against the condition that is being treated. For example, the compounds of the instant invention may also be co-administered with other well known cancer therapeutic agents that are selected for their particular usefulness against the condition that is being treated. Included in such combinations of therapeutic agents are combinations of the instant farnesyl-protein transferase inhibitors and an antineo- plastic agent. It is also understood that such a combination of antineoplastic agent
and inhibitor of farnesyl-protein transferase may be used in conjunction with other methods of treating cancer and/or tumors, including radiation therapy and surgery.
Examples of an antineoplastic agent include, in general, microtubule- stabilizing agents ( such as paclitaxel (also known as Taxol®), docetaxel (also known as Taxotere®), epothilone A, epothilone B, desoxyepothilone A, desoxyepothilone B or their derivatives); microtubule-disruptor agents; alkylating agents, anti-metabolites; epidophyllotoxin; an antineoplastic enzyme; a topoisomerase inhibitor; procarbazine; mitoxantrone; platinum coordination complexes; biological response modifiers and growth inhibitors; hormonal/anti-hormonal therapeutic agents and haematopoietic growth factors.
Example classes of antineoplastic agents include, for example, the anthracycline family of drugs, the vinca drugs, the mitomycins, the bleomycins, the cytotoxic nucleosides, the taxanes, the epothilones, discodermolide, the pteridine family of drugs, diynenes and the podophyllotoxins. Particularly useful members of those classes include, for example, doxorubicin, carminomycin, daunorubicin, aminopterin, methotrexate, methopterin, dichloro-methotrexate, mitomycin C, porfiromycin, 5-fluorouracil, 6-mercaptopurine, gemcitabine, cytosine arabinoside, podophyllotoxin or podo-phyllotoxin derivatives such as etoposide, etoposide phosphate or teniposide, melphalan, vinblastine, vincristine, leurosidine, vindesine, leurosine, paclitaxel and the like. Other useful antineoplastic agents include estramustine, cisplatin, carboplatin, cyclophosphamide, bleomycin, tamoxifen, ifosamide, melphalan, hexamethyl melamine, thiotepa, cytarabin, idatrexate, trimetrexate, dacarbazine, L-asparaginase, camptothecin, CPT-11, topotecan, ara-C, bicalutamide, flutamide, leuprolide, pyridobenzoindole derivatives, interferons and interleukins.
The prefeπed class of antineoplastic agents is the taxanes and the prefeπed antineoplastic agent is paclitaxel.
Radiation therapy, including x-rays or gamma rays which are delivered from either an externally applied beam or by implantation of tiny radioactive sources,
may also be used in combination with the instant inhibitor of farnesyl-protein transferase alone to treat cancer.
Additionally, compounds of the instant invention may also be useful as radiation sensitizers, as described in WO 97/38697, published on October 23, 1997, and herein incoφorated by reference.
The instant compounds may also be useful in combination with other inhibitors of parts of the signaling pathway that links cell surface growth factor receptors to nuclear signals initiating cellular proliferation. Thus, the instant compounds may be utilized in combination with farnesyl pyrophosphate competitive inhibitors of the activity of farnesyl-protein transferase or in combination with a compound which has Raf antagonist activity. The instant compounds may also be co-administered with compounds that are selective inhibitors of geranylgeranyl protein transferase. In particular, if the compound of the instant invention is a selective inhibitor of farnesyl-protein transferase, co-administration with a compound(s) that is a selective inhibitor of geranylgeranyl protein transferase may provide an improved therapeutic effect.
In particular, the compounds disclosed in the following patents and publications may be useful as farnesyl pyrophosphate-competitive inhibitor component of the instant composition: U.S. Ser. Nos. 08/254,228 and 08/435,047. Those patents and publications are incoφorated herein by reference.
In practicing methods of this invention, which comprise administering, simultaneously or sequentially or in any order, two or more of a protein substrate- competitive inhibitor and a farnesyl pyrophosphate-competitive inhibitor, such administration can be orally or parenterally, including intravenous, intramuscular, intraperitoneal, subcutaneous, rectal and topical routes of administration. It is preferred that such administration be orally. It is more prefeπed that such administration be orally and simultaneously. When the protein substrate-competitive inhibitor and farnesyl pyrophosphate-competitive inhibitor are administered sequentially, the administration of each can be by the same method or by different methods. The instant compounds may also be useful in combination with
an integrin antagonist for the treatment of cancer, as described in U.S. Ser. No. 09/055,487, filed April 6, 1998, which is incoφorated herein by reference.
As used herein the term an integrin antagonist refers to compounds which selectively antagonize, inhibit or counteract binding of a physiological ligand to an integrin(s) that is involved in the regulation of angiogenisis, or in the growth and invasiveness of tumor cells. In particular, the term refers to compounds which selectively antagonize, inhibit or counteract binding of a physiological ligand to the αvβ3 integrin, which selectively antagonize, inhibit or counteract binding of a physiological ligand to the αvβ5 integrin, which antagonize, inhibit or counteract binding of a physiological ligand to both the αvβ3 integrin and the αvβ5 integrin, or which antagonize, inhibit or counteract the activity of the particular integrin(s) expressed on capillary endothelial cells. The term also refers to antagonists of the αlβl, α2βl, α5βl, α6βl and α6β4 integrins. The term also refers to antagonists of any combination of αvβ3 integrin, αvβ5 integrin, αlβl, α2βl, α5βl, ocόβl and α6β4 integrins. The instant compounds may also be useful with other agents that inhibit angiogenisis and thereby inhibit the growth and invasiveness of rumor cells, including, but not limited to angiostatin and endostatin.
The instant compounds may also be useful in combination with an inhibitor of 3-hydroxy-3-methylglutaryl-CoA reductase (HMG-CoA reductase) for the treatment of cancer. Compounds which have inhibitory activity for HMG-CoA reductase can be readily identified by using assays well-known in the art. For example, see the assays described or cited in U.S. Patent 4,231,938 at col. 6, and WO 84/02131 at pp. 30-33. The terms "HMG-CoA reductase inhibitor" and "inhibitor of HMG-CoA reductase" have the same meaning when used herein. Examples of HMG-CoA reductase inhibitors that may be used include but are not limited to lovastatin (MEVACOR®; see US Patent No. 4,231,938; 4,294,926; 4,319,039), simvastatin (ZOCOR®; see US Patent No. 4,444,784; 4,820,850; 4,916,239), pravastatin (PRAVACHOL®; see US Patent Nos. 4,346,227; 4,537,859; 4,410,629; 5,030,447 and 5,180,589), fluvastatin (LESCOL®; see US
Patent Nos. 5,354,772; 4,911,165; 4,929,437; 5,189,164; 5,118,853; 5,290,946;
5,356,896), atorvastatin (LIPITOR®; see US Patent Nos. 5,273,995; 4,681,893;
5,489,691 ; 5,342,952) and cerivastatin (also known as rivastatin and BAYCHOL®; see US Patent No. 5,177,080). The structural formulas of these and additional HMG- CoA reductase inhibitors that may be used in the instant methods are described at page 87 of M. Yalpani, "Cholesterol Lowering Drugs", Chemistry & Industry, pp. 85-89 (5 February 1996) and US Patent Nos. 4,782,084 and 4,885,314. The term HMG-CoA reductase inhibitor as used herein includes all pharmaceutically acceptable lactone and open-acid forms (i.e., where the lactone ring is opened to form the free acid) as well as salt and ester forms of compounds which have HMG-CoA reductase inhibitory activity, and therefor the use of such salts, esters, open-acid and lactone forms is included within the scope of this invention. An illustration of the lactone portion and its corresponding open-acid form is shown below as structures I and fl.
L ■Iactone pen-Acid I II
In HMG-CoA reductase inhibitor's where an open-acid form can exist, salt and ester forms may preferably be formed from the open-acid, and all such forms are included within the meaning of the term "HMG-CoA reductase inhibitor" as used herein. Preferably, the HMG-CoA reductase inhibitor is selected from lovastatin and simvastatin, and most preferably simvastatin. Herein, the term "pharmaceutically acceptable salts" with respect to the HMG-CoA reductase inhibitor shall mean non- toxic salts of the compounds employed in this invention which are generally prepared
by reacting the free acid with a suitable organic or inorganic base, particularly those formed from cations such as sodium, potassium, aluminum, calcium, lithium, magnesium, zinc and tetramethylammonium, as well as those salts formed from amines such as ammonia, ethylenediamine, N-methylglucamine, lysine, arginine, ornithine, choline, N,N'-dibenzyl ethyl enediamine, chloroprocaine, diethanolamine, procaine, N-benzylphenethylamine, l-p-chlorobenzyl-2-pyrrolidine-l '-yl- methylbenzimidazole, diethylamine, piperazine, and tris(hydroxymethyl) aminomethane. Further examples of salt forms of HMG-CoA reductase inhibitors may include, but are not limited to, acetate, benzenesulfonate, benzoate, bicarbonate, bisulfate, bitartrate, borate, bromide, calcium edetate, camsylate, carbonate, chloride, clavulanate, citrate, dihydrochloride, edetate, edisylate, estolate, esylate, fumarate, gluceptate, gluconate, glutamate, glycollylarsanilate, hexylresorcinate, hydrabamine, hydrobromide, hydrochloride, hydroxynapthoate, iodide, isothionate, lactate, lactobionate, laurate, malate, maleate, mandelate, mesylate, methylsulfate, mucate, napsylate, nitrate, oleate, oxalate, pamaote, palmitate, panthothenate, phosphate/ diphosphate, polygalacturonate, salicylate, stearate, subacetate, succinate, tannate, tartrate, teoclate, tosylate, triethiodide, and valerate.
Ester derivatives of the described HMG-CoA reductase inhibitor compounds may act as prodrugs which, when absorbed into the bloodstream of a warm-blooded animal, may cleave in such a manner as to release the drug form and permit the drug to afford improved therapeutic efficacy.
Similarly, the instant compounds may be useful in combination with agents that are effective in the treatment and prevention of NF-1, restenosis, polycystic kidney disease, infections of hepatitis delta and related viruses and fungal infections.
If formulated as a fixed dose, such combination products employ the combinations of this invention within the dosage range described above and the other pharmaceutically active agent(s) within its approved dosage range. Combinations
of the instant invention may alternatively be used sequentially with known pharmaceutically acceptable agent(s) when a multiple combination formulation is inappropriate.
The compounds of the instant invention are also useful as a component in an assay to rapidly determine the presence and quantity of farnesyl- protein transferase (FPTase) in a composition. Thus the composition to be tested may be divided and the two portions contacted with mixtures which comprise a known substrate of FPTase (for example a tetrapeptide having a cysteine at the amine terminus) and farnesyl pyrophosphate and, in one of the mixtures, a compound of the instant invention. After the assay mixtures are incubated for an sufficient period of time, well known in the art, to allow the FPTase to famesylate the substrate, the chemical content of the assay mixtures may be determined by well known immunological, radiochemical or chromatographic techniques. Because the compounds of the instant invention are selective inhibitors of FPTase, absence or quantitative reduction of the amount of substrate in the assay mixture without the compound of the instant invention relative to the presence of the unchanged substrate in the assay containing the instant compound is indicative of the presence of FPTase in the composition to be tested.
It would be readily apparent to one of ordinary skill in the art that such an assay as described above would be useful in identifying tissue samples which contain farnesyl-protein transferase and quantitating the enzyme. Thus, potent inhibitor compounds of the instant invention may be used in an active site titration assay to determine the quantity of enzyme in the sample. A series of samples composed of aliquots of a tissue extract containing an unknown amount of farnesyl- protein transferase, an excess amount of a known substrate of FPTase (for example a tetrapeptide having a cysteine at the amine terminus) and farnesyl pyrophosphate are incubated for an appropriate period of time in the presence of varying concentrations of a compound of the instant invention. The concentration of a sufficiently potent inhibitor (i.e., one that has a Ki substantially smaller than the concentration of enzyme in the assay vessel) required to inhibit the enzymatic activity of the sample by 50% is
approximately equal to half of the concentration of the enzyme in that particular sample.
ASSAYS
The compounds of the instant invention described in the Examples were tested by the assays described below and were found to have activity.
ASSAY 1
In vitro inhibition of ras farnesyl transferase
Transferase Assays. Isoprenyl-protein transferase activity assays are carried out at 30°C unless noted otherwise. A typical reaction contains (in a final volume of 50 μL): [^Hjfarnesyl diphosphate, Ras protein, 50 mM HEPES, pH 7.5, 5 mM MgCb., 5 mM dithiothreitol, 10 μM ZnCl2, 0.1% polyethyleneglycol (PEG)
(15,000-20,000 mw) and isoprenyl-protein transferase. The FPTase employed in the assay is prepared by recombinant expression as described in Omer, C.A., Krai, A.M., Diehl, R.E., Prendergast, G.C., Powers, S., Allen, CM., Gibbs, J.B. and Kohl, N.E. (1993) Biochemistry 32:5167-5176. After thermally pre-equilibrating the assay mixture in the absence of enzyme, reactions are initiated by the addition of isoprenyl- protein transferase and stopped at timed intervals (typically 15 min) by the addition of 1 M HCl in ethanol (1 mL). The quenched reactions are allowed to stand for 15 m (to complete the precipitation process). After adding 2 mL of 100% ethanol, the reactions are vacuum-filtered through Whatman GF/C filters. Filters are washed four times with 2 mL aliquots of 100% ethanol, mixed with scintillation fluid (10 mL) and then counted in a Beckman LS3801 scintillation counter.
For inhibition studies, assays are run as described above, except inhibitors are prepared as concentrated solutions in 100% dimethyl sulfoxide and then diluted 20-fold into the enzyme assay mixture. Substrate concentrations for inhibitor
IC50 determinations are as follows: FTase, 650 nM Ras-CVLS (SEQ.ID.NO.: 1), 100 nM farnesyl diphosphate.
The compounds of the instant invention are tested for inhibitory activity against human FPTase by the assay described above.
ASSAY 2
Modified In vitro GGTase inhibition assay
The modified geranylgeranyl-protein transferase inhibition assay is carried out at room temperature. A typical reaction contains (in a final volume of
50 μL): [^HJgeranylgeranyl diphosphate, biotinylated Ras peptide, 50 mM HEPES, pH 7.5, a modulating anion (for example 10 mM glycerophosphate or 5mM ATP), 5 mM MgCl2, 10 μM ZnCb., 0.1% PEG (15,000-20,000 mw), 2 mM dithiothreitol, and geranylgeranyl-protein transferase type I(GGTase). The GGTase-type I enzyme employed in the assay is prepared as described in U.S. Pat. No. 5,470,832, incoφorated by reference. The Ras peptide is derived from the K4B-Ras protein and has the following sequence: biotinyl-GKKKKKKSKTKCVIM (single amino acid code) (SEQ.ID.NO.: 2). Reactions are initiated by the addition of GGTase and stopped at timed intervals (typically 15 min) by the addition of 200 μL of a 3 mg/mL suspension of streptavidin SPA beads (Scintillation Proximity Assay beads, Amersham) in 0.2 M sodium phosphate, pH 4, containing 50 mM EDTA, and 0.5% BSA. The quenched reactions are allowed to stand for 2 hours before analysis on a Packard TopCount scintillation counter.
For inhibition studies, assays are run as described above, except inhibitors are prepared as concentrated solutions in 100% dimethyl sulfoxide and then diluted 25-fold into the enzyme assay mixture. IC50 values are determined with Ras peptide near K concentrations. Enzyme and substrate concentrations for inhibitor IC50 determinations are as follows: 75 pM GGTase-I, 1.6 μM Ras peptide, 100 nM geranylgeranyl diphosphate.
The compounds of the instant invention are tested for inhibitory activity against human GGTase-type I by the assay described above.
ASSAY 3
Cell-based in vitro ras farnesylation assay
The cell line used in this assay is a v-ras line derived from either
Ratl or NIH3T3 cells, which expressed viral Ha-ras p21. The assay is performed essentially as described in DeClue, J.E. et al.. Cancer Research 51 :712-717, (1991). Cells in 10 cm dishes at 50-75%> confluency are treated with the test compound (final concentration of solvent, methanol or dimethyl sulfoxide, is 0.1%). After 4 hours at 37°C, the cells are labeled in 3 mL methionine-free DMEM supple-mented with 10% regular DMEM, 2% fetal bovine serum and 400 μCi[35S]methionine (1000 Ci/mmol). After an additional 20 hours, the cells are lysed in 1 mL lysis buffer (1% NP40/20 mM HEPES, pH 7.5/5 mM MgCl2/lmM DTT/10 mg/mL aprotinen/2 mg/mL leupeptin/2 mg/mL antipain/0.5 mM PMSF) and the lysates cleared by centrifugation at 100,000 x g for 45 min. Aliquots of lysates containing equal numbers of acid-precipitable counts are bought to 1 mL with IP buffer (lysis buffer lacking DTT) and immuno-precipitated with the ras-specific monoclonal antibody Y13-259 (Furth, M.E. et ah, J. Virol. 43:294-304, (1982)). Following a 2 hour antibody incubation at 4°C, 200 μl of a 25% suspension of protein A-Sepharose coated with rabbit anti rat IgG is added for 45 min. The immuno-precipitates are washed four times with IP buffer (20 nM HEPES, pH 7.5/1 mM EDTA/1%> Triton X- 100.0.5% deoxycholate/0.1%/SDS/0.1 M NaCl) boiled in SDS-PAGE sample buffer and loaded on 13%> acrylamide gels. When the dye front reached the bottom, the gel is fixed, soaked in Enlightening, dried and autoradiographed. The intensities of the bands coπesponding to farnesylated and nonfarnesylated ras proteins are compared to determine the percent inhibition of farnesyl transfer to protein.
ASSAY 4
Cell-based in vitro growth inhibition assay
To determine the biological consequences of FPTase inhibition, the effect of the compounds of the instant invention on the anchorage- independent growth of Ratl cells transformed with either a v-ras, v-raf, or v-mos oncogene is tested. Cells transformed by v-Raf and v-Mos maybe included in the analysis to evaluate the specificity of instant compounds for Ras-induced cell transformation.
Rat 1 cells transformed with either v-ras, v-raf, or v-mos are seeded at a density of 1 x 10^ cells per plate (35 mm in diameter) in a 0.3%> top agarose layer in medium A (Dulbecco's modified Eagle's medium supplemented with 10%> fetal bovine serum) over a bottom agarose layer (0.6%). Both layers contain 0.1% methanol or an appropriate concentration of the instant compound (dissolved in methanol at 1000 times the final concentration used in the assay). The cells are fed twice weekly with 0.5 mL of medium A containing 0.1 % methanol or the concentration of the instant compound. Photomicrographs are taken 16 days after the cultures are seeded and comparisons are made.
ASSAY 5
Construction of SEAP reporter plasmid pDSElOO
The SEAP reporter plasmid, pDSElOO was constructed by ligating a restriction fragment containing the SEAP coding sequence into the plasmid pCMV- RE-AKI. The SEAP gene is derived from the plasmid pSEAP2-Basic (Clontech, Palo Alto, CA). The plasmid pCMV-RE-AKI was constructed by Deborah Jones (Merck) and contains 5 sequential copies of the 'dyad symmetry response element' cloned upstream of a 'CAT-TATA' sequence derived from the cytomegalovirus immediate early promoter. The plasmid also contains a bovine growth hormone poly-A sequence.
The plasmid, pDSElOO was constructed as follows. A restriction fragment encoding the SEAP coding sequence was cut out of the plasmid pSEAP2- Basic using the restriction enzymes EcoRI and Hpal. The ends of the linear DNA fragments were filled in with the Klenow fragment of E. coli DNA Polymerase I. The "blunt ended" DNA containing the SEAP gene was isolated by electrophoresing the digest in an agarose gel and cutting out the 1694 base pair fragment. The vector plasmid pCMV-RE-AKI was linearized with the restriction enzyme Bgl-II and the ends filled in with Klenow DNA Polymerase I. The SEAP DNA fragment was blunt end ligated into the pCMV-RE-AKI vector and the ligation products were transformed into DH5-alpha E. coli cells (Gibco-BRL). Transformants were screened for the proper insert and then mapped for restriction fragment orientation. Properly oriented recombinant constructs were sequenced across the cloning junctions to verify the coπect sequence. The resulting plasmid contains the SEAP coding sequence downstream of the DSE and CAT-TATA promoter elements and upstream of the BGH poly-A sequence.
Alternative Construction of SEAP reporter plasmid, pDSElOl
The SEAP repotrer plasmid, pDSElOl is also constructed by ligating a restriction fragment containing the SEAP coding sequence into the plasmid pCMV- RE-AKI. The SEAP gene is derived from plasmid pGEM7zf(-)/SEAP.
The plasmid pDSElOl was constructed as follows: A restriction fragment containing part of the SEAP gene coding sequence was cut out of the plasmid pGEM7zf(-)/SEAP using the restriction enzymes Apa I and Kpnl. The ends of the linear DNA fragments were chewed back with the Klenow fragment of E. coli DNA Polymerase I. The "blunt ended" DNA containing the truncated SEAP gene was isolated by electrophoresing the digest in an agarose gel and cutting out the 1910 base pair fragment. This 1910 base pair fragment was ligated into the plasmid pCMV-RE-AKI which had been cut with Bgl-II and filled in with E. coli Klenow fragment DNA polymerase. Recombinant plasmids were screened for insert orientation and sequenced through the ligated junctions. The plasmid pCMV -RE-AKI
is derived from plasmid pCMVIE-AKI-DHFR (Whang , Y., Silberklang, M., Morgan, A., Munshi, S., Lenny, A.B., Ellis, R.W., and Kieff, E. (1987) J. Virol., 61, 1796- 1807) by removing an EcoRI fragment containing the DHFR and Neomycin markers. Five copies of the fos promoter serum response element were inserted as described previously (Jones, R.E., Defeo- Jones, D., McAvoy, E.M., Vuocolo, G.A., Wegrzyn, R.J., Haskell, K.M. and Oliff, A. (1991) Oncogene, 6, 745-751) to create plasmid pCMV-RE-AKI.
The plasmid pGEM7zf(-)/SEAP was constructed as follows. The SEAP gene was PCRed, in two segments from a human placenta cDNA library (Clontech) using the following oligos.
Sense strand N-terminal SEAP : 5' GAGAGGGAATTCGGGCCCTTCCTGCAT GCTGCTGCTGCTGCTGCTGCTGGGC 3' (SEQ.ID.NO. :4)
Antisense strand N-terminal SEAP: 5' GAGAGAGCTCGAGGTTAACCCGGGT GCGCGGCGTCGGTGGT 3' (SEQ.ID.NO. :5)
Sense strand C-terminal SEAP: 5' GAGAGAGTCTAGAGTTAACCCGTGGTCC CCGCGTTGCTTCCT 3' (SEQ.ID.NO. :6)
Antisense strand C-terminal SEAP: 5' GAAGAGGAAGCTTGGTACCGCCACTG GGCTGTAGGTGGTGGCT 3' (SEQ.ID.NO. :7)
The N-terminal oligos (SEQ.ID.NO.: 4 and SEQ.ID.NO.: 5) were used to generate a 1560 bp N-terminal PCR product that contained EcoRI and Hpal restriction sites at the ends. The Antisense N-terminal oligo (SEQ.ID.NO.: 5) introduces an internal translation STOP codon within the SEAP gene along with the Hpal site. The C-terminal oligos (SEQ.ID.NO.: 6 and SEQ.ID.NO.: 7) were used to amplify a 412 bp C-terminal PCR product containing Hpal and Hindlll restriction sites. The sense strand C-terminal oligo (SEQ.ID.NO.: 6) introduces the internal
STOP codon as well as the Hpal site. Next, the N-terminal amplicon was digested with EcoRI and Hpal while the C-terminal amplicon was digested with Hpal and Hindlll. The two fragments comprising each end of the SEAP gene were isolated by electro-phoresing the digest in an agarose gel and isolating the 1560 and 412 base pair fragments. These two fragments were then co-ligated into the vector pGEM7zf(-)
(Promega) which had been restriction digested with EcoRI and Hindlll and isolated on an agarose gel. The resulting clone, pGEM7zf(-)/SEAP contains the coding sequence for the SEAP gene from amino acids.
Construction of a constitutively expressing SEAP plasmid pCMV-SEAP-A
An expression plasmid constitutively expressing the SEAP protein was created by placing the sequence encoding a truncated SEAP gene downstream of the cytomegalovirus (CMV) IE-1 promoter. The expression plasmid also includes the CMV intron A region 5' to the SEAP gene as well as the 3' untranslated region of the bovine growth hormone gene 3' to the SEAP gene.
The plasmid pCMVIE-AKI-DHFR (Whang , Y., Silberklang, M., Morgan, A., Munshi, S., Lenny, A.B., Ellis, R.W., and Kieff, E. (1987) J. Virol., 61 :1796- 1807) containing the CMV immediate early promoter was cut with EcoRI generating two fragments. The vector fragment was isolated by agarose electro- phoresis and religated. The resulting plasmid is named pCMV-AKI. Next, the cytomegalovirus intron A nucleotide sequence was inserted downstream of the CMV IE1 promter in pCMV-AKI. The intron A sequence was isolated from a genomic clone bank and subcloned into pBR322 to generate plasmid pl6T-286. The intron A sequence was mutated at nucleotide 1856 (nucleotide numbering as in Chapman, B.S., Thayer, R.M., Vincent, K.A. and Haigwood, N.L., Nuc.Acids Res. 19, 3979-3986) to remove a Sad restriction site using site directed mutagenesis. The mutated intron A sequence was PCRed from the plasmid pl6T-287 using the following oligos.
Sense strand: 5' GGCAGAGCTCGTTTAGTGAACCGTCAG 3' (SEQ.ID.NO.: 8)
Antisense strand: 5' GAGAGATCTCAAGGACGGTGACTGCAG 3' (SEQ.ID.NO.: 9)
These two oligos generate a 991 base pair fragment with a Sad site incoφorated by the sense oligo and a Bgl-II fragment incoφorated by the antisense oligo. The PCR fragment is trimmed with Sad and Bgl-II and isolated on an agarose gel. The vector pCMV-AKI is cut with Sad and Bgl-II and the larger vector fragment isolated by agarose gel electrophoresis. The two gel isolated fragments are ligated at their respective Sad and Bgl-II sites to create plasmid pCMV-AKl-lnA. The DNA sequence encoding the truncated SEAP gene is inserted into the pCMV-AKI-InA plasmid at the Bgl-II site of the vector. The SEAP gene is cut out of plasmid pGEM7zf(-)/SEAP (described above) using EcoRI and Hindm. The fragment is filled in with Klenow DNA polymerase and the 1970 base pair fragment isolated from the vector fragment by agarose gel electrophoresis. The pCMV-AKI- InA vector is prepared by digesting with Bgl-II and filling in the ends with Klenow DNA polymerase. The final construct is generated by blunt end ligating the SEAP fragment into the pCMV-AKI-InA vector. Transformants were screened for the proper insert and then mapped for restriction fragment orientation. Properly oriented recombinant constructs were sequenced across the cloning junctions to verify the coπect sequence. The resulting plasmid, named pCMV-SEAP-A (deposited in the ATCC under Budapest Treaty on August 27, 1998, and designated ATCC), contains a modified SEAP sequence downstream of the cytomegalovirus immediately early promoter IE-1 and intron A sequence and upstream of the bovine growth hormone poly-A sequence. The plasmid expresses SEAP in a constitutive manner when transfected into mammalian cells.
Alternative construction of a constitutively expressing SEAP plasmid pCMV-SEAP-B An expression plasmid constitutively expressing the SEAP protein
can be created by placing the sequence encoding a truncated SEAP gene downstream of the cytomegalovirus (CMV) IE-1 promoter and upstream of the 3' unstranslated region of the bovine growth hormone gene.
The plasmid pCMVIE-AKI-DHFR (Whang , Y., Silberklang, M., Morgan, A., Munshi, S., Lenny, A.B., Ellis, R.W., and Kieff, E. (1987) J. Virol., 61 :1796-1807) containing the CMV immediate early promoter and bovine growth hormone poly-A sequence can be cut with EcoRI generating two fragments. The vector fragment can be isolated by agarose electrophoresis and religated. The resulting plasmid is named pCMV-AKI. The DNA sequence encoding the truncated SEAP gene can be inserted into the pCMV-AKI plasmid at a unique Bgl-II in the vector. The SEAP gene is cut out of plasmid pGEMzf(-)/SEAP (described above) using EcoRI and Hindlll. The fragments are filled in with Klenow DNA polymerase and the 1970 base pair fragment is isolated from the vector fragment by agarose gel electrophoresis. The pCMV-AKI vector is prepared by digesting with Bgl-II and filling in the ends with Klenow DNA polymerase. The final construct is generated by blunt end ligating the SEAP fragment into the vector and transforming the ligation reaction into E. coli DH5a cells. Transformants can then be screened for the proper insert and mapped for restriction fragment orientation. Properly oriented recombinant constructs would be sequenced across the cloning junctions to verify the coπect sequence. The resulting plasmid, named pCMV-SEAP-B contains a modified SEAP sequence downstream of the cytomegalovirus immediate early promoter, IE1, and upstream of a bovine growth hormone poly-A sequence. The plasmid would express SEAP in a constitutive nammer when transfected into mammalian cells.
Cloning of a Myristylated viral-H-rαs expression plasmid pSMS600
A DNA fragment containing viral-H-rαs can be PCRed from plasmid HB-11 (deposited in the ATCC under Budapest Treaty on August 27, 1997, and designated ATCC 209,218) using the following oligos.
Sense strand:
5'TCTCCTCGAGGCCACCATGGGGAGTAGCAAGAGCAAGCCTAAGGACCC CAGCCAGCGCCGGATGACAGAATACAAGCTTGTGGTGG 3'. (SEQ.ID.NO.: 10)
Antisense:
5 'CACATCTAGATCAGGACAGCACAGACTTGCAGC 3 ' .
(SEQ.ID.NO.: 11)
A sequence encoding the first 15 aminoacids of the v-src gene, containing a myristylation site, is incoφorated into the sense strand oligo. The sense strand oligo also optimizes the 'Kozak' translation initiation sequence immediately 5' to the ATG start site. To prevent prenylation at the viral-rαs C-terminus, cysteine 186 would be mutated to a serine by substituting a G residue for a C residue in the C-terminal antisense oligo. The PCR primer oligos introduce an Xhol site at the 5' end and a Xbal site at the 3'end. The Xhol-Xbal fragment can be ligated into the mammalian expression plasmid pCI (Promega) cut with Xhol and Xbal. This results in a plasmid, pSMS600, in which the recombinant myr-viral-H-ras gene is constitutively transcribed from the CMV promoter of the pCI vector.
Cloning of a viral-H-rαs-CVLL expression plasmid pSMS601
A viral-H-rαs clone with a C-terminal sequence encoding the amino acids CVLL can be cloned from the plasmid "HB-11" by PCR using the following oligos.
Sense strand:
5 'TCTCCTCGAGGCC ACC ATGAC AGAATAC AAGCTTGTGGTGG-3 '
(SEQ.ID.NO.: 12)
Antisense strand:
5'CACTCTAGACTGGTGTCAGAGCAGCACACACTTGCAGC-3' (SEQ.ID.NO.: 13)
The sense strand oligo optimizes the 'Kozak' sequence and adds an Xhol site. The antisense strand mutates serine 189 to leucine and adds an Xbal site. The PCR fragment can be trimmed with Xhol and Xbal and ligated into the Xhol- Xbal cut vector pCI (Promega). This results in a plasmid, pSMS601 , in which the mutated viral-H-rαs-CVLL gene is constitutively transcribed from the CMV promoter of the pCI vector.
Cloning of cellular-H-rαs-Leu61 expression plasmid pSMS620
The human cellular-H-rαs gene can be PCRed from a human cerebral cortex cDNA library (Clontech) using the following oligonucleotide primers.
Sense strand:
5 '-GAGAGAATTCGCCACCATGACGGAATATAAGCTGGTGG-3 ' (SEQ.ID.NO.: 14)
Antisense strand: 5'-GAGAGTCGACGCGTCAGGAGAGCACACACTTGC-3' (SEQ.ID.NO.: 15)
The primers will amplify a c-H-Ras encoding DNA fragment with the primers contributing an optimized 'Kozak' translation start sequence, an EcoRI site at the N-terminus and a Sal I site at the C-terminal end. After trimming the ends of the PCR product with EcoRI and Sal I, the c-H-ras fragment can be ligated ligated into an EcoRI -Sal I cut mutagenesis vector p Alter- 1 (Promega). Mutation of glutamine-61 to a leucine can be accomplished using the manufacturer's protocols and the following oligonucleotide:
5'-CCGCCGGCCTGGAGGAGTACAG-3' (SEQ.ID.NO.: 16)
After selection and sequencing for the coπect nucleotide substitution, the mutated c-H-rαs-Leu61 can be excised from the pAlter-1 vector, using EcoRI and Sal I, and be directly ligated into the vector pCI (Promega) which has been digested with EcoRI and Sal I. The new recombinant plasmid, pSMS620, will constitutively transcribe c-H-rαs-Leu61 from the CMV promoter of the pCI vector.
Cloning of a c-N-rαs-Val-12 expression plasmid pSMS630
The human c-N-rαs gene can be PCRed from a human cerebral cortex cDNA library (Clontech) using the following oligonucleotide primers.
Sense strand:
5 '-GAGAGAATTCGCCACCATGACTGAGTACAAACTGGTGG-3 ' (SEQ.ID.NO.: 17)
Antisense strand:
5'-GAGAGTCGACTTGTTACATCACCACACATGGC-3' (SEQ.ID.NO.: 18)
The primers will amplify a c-N-Ras encoding DNA fragment with the primers contributing an optimized 'Kozak' translation start sequence, an EcoRI site at the N-terminus and a Sal I site at the C-terminal end. After trimming the ends of the PCR product with EcoRI and Sal I, the c-N-ras fragment can be ligated into an EcoRI -Sal I cut mutagenesis vector pAlter-1 (Promega). Mutation of glycine-12 to a valine can be accomplished using the manufacturer's protocols and the following oligonucleotide:
5'-GTTGGAGCAGTTGGTGTTGGG-3' (SEQ.ID.NO.: 19)
After selection and sequencing for the coπect nucleotide substitution, the mutated c-N-rαs-Val-12 can be excised from the pAlter-1 vector, using EcoRI and
Sal I, and be directly ligated into the vector pCI (Promega) which has been digested with EcoRI and Sal I. The new recombinant plasmid, pSMS630, will constitutively transcribe c-N-rαs-Val-12 from the CMV promoter of the pCI vector.
Cloning of a c-K4B-rαs-Val-12 expression plasmid pSMS640
The human c-K4B-rαs gene can be PCRed from a human cerebral cortex cDNA library (Clontech) using the following oligo-nucleotide primers.
Sense strand: 5 '-GAGAGGTACCGCCACCATGACTGAATATAAACTTGTGG-3 ' (SEQ.ID.NO.: 20)
Antisense strand:
5'-CTCTGTCGACGTATTTACATAATTACACACTTTGTC-3' (SEQ.ID.NO.: 21)
The primers will amplify a c-K4B-Ras encoding DNA fragment with the primers contributing an optimized "Kozak" translation start sequence, a Kpnl site at the N-terminus and a Sal I site at the C-terminal end. After trimming the ends of the PCR product with Kpn I and Sal I, the c-K4B-rαs fragment can be ligated into a Kpnl -Sal I cut mutagenesis vector pAlter-1 (Promega). Mutation of cysteine-12 to a valine can be accomplished using the manufacturer's protocols and the following oligonucleotide:
5'-GTAGTTGGAGCTGTTGGCGTAGGC-3' (SEQ.ID.NO.: 22)
After selection and sequencing for the coπect nucleotide substitution, the mutated c-K4B-rαs-Val-12 can be excised from the p Alter- 1 vector, using Kpnl and Sal I, and be directly ligated into the vector pCI (Promega) which has been digested with Kpnl and Sal I. The new recombinant plasmid will constitutively transcribe c-K4B-rαs-Val-12 from the CMV promoter of the pCI vector.
Cloning of c-K-rαs4A-Val-12 expression plasmid pSMS650
The human c-K4A-rαs gene can be PCRed from a human cerebral cortex cDNA library (Clontech) using the following oligo-nucleotide primers.
Sense strand:
5'-GAGAGGTACCGCCACCATGACTGAATATAAACTTGTGG-3'
(SEQ.ID.NO.: 23)
Antisense strand:
5 '-CTCTGTCGACAGATTACATTATAATGCATTTTTTAATTTTCACAC-3 ' (SEQ.ID.NO.: 24)
The primers will amplify a c-K4A-Ras encoding DNA fragment with the primers contributing an optimized 'Kozak' translation start sequence, a Kpnl site at the N-terminus and a Sal I stite at the C-terminal end. After trimming the ends of the PCR product with Kpn I and Sal I, the c-K-ras4A fragment can be ligated into a Kpnl -Sal I cut mutagenesis vector p Alter- 1 (Promega). Mutation of cysteine-12 to a valine can be accomplished using the manufacturer's protocols and the following oligonucleotide:
5'-GTAGTTGGAGCTGTTGGCGTAGGC-3' (SEQ.ID.NO.: 3)
After selection and sequencing for the coπect nucleotide substitution, the mutated c-K4A-rαs-Val-12 can be excised from the pAlter-1 vector, using Kpnl and Sal I, and be directly ligated into the vector pCI (Promega) which has been digested with Kpnl and Sal I. The new recombinant plasmid, pSMS650, will constitutively transcribe c-K4A-rαs-Val-12 from the CMV promoter of the pCI vector.
SEAP assay
Human C33A cells (human epitheial carcenoma - ATTC collection) are seeded in 10cm tissue culture plates in DMEM + 10%o fetal calf serum + IX Pen/Strep + IX glutamine + IX NEAA. Cells are grown at 37°C in a 5% CO2 atmosphere until they reach 50 -80% of confluency.
The transient transfection is performed by the CaPO4 method (Sambrook et al., 1989). Thus, expression plasmids for H-rαs, N-rαs, K-rαs, Myr- ras or H-rαs-CVLL are co-precipitated with the DSE-SEAP reporter construct. (A ras expression plasmid is not included when the cell is transfected with the pCMV- SEAP plasmid.) For 10 cm plates 600 mL of CaCl2-DNA solution is added dropwise while vortexing to 600 mL of 2X HBS buffer to give 1.2 mL of precipitate solution (see recipes below). This is allowed to sit at room temperature for 20 to 30 minutes. While the precipitate is forming, the media on the C33A cells is replaced with DMEM (minus phenol red; Gibco cat. No. 31053-028)+ 0.5% charcoal stripped calf serum + IX (Pen/Strep, Glutamine and nonessential aminoacids). The CaPO4-DNA precipitate is added dropwise to the cells and the plate rocked gently to distribute. DNA uptake is allowed to proceed for 5-6 hrs at 37°C under a 5% CO2 atmosphere. Following the DNA incubation period, the cells are washed with PBS and trypsinized with lmL of 0.05% trypsin. The 1 mL of trypsinized cells is diluted into 10 mL of phenol red free DMEM + 0.2% charcoal stripped calf serum + IX
(Pen/Strep, Glutamine and NEAA ). Transfected cells are plated in a 96 well microtiter plate (100 mL/well) to which drug, diluted in media, has already been added in a volume of 100 mL. The final volume per well is 200 mL with each drug concentration repeated in triplicate over a range of half- log steps. Incubation of cells and drugs is for 36 hrs at 37°C under CO2- At the end of the incubation period, cells are examined micro-scopically for evidence of cell distress. Next, 100 mL of media containing the secreted alkaline phosphatase is removed from each well and transfeπed to a microtube aπay for heat treatment at 65°C for 1 hr to inactivate endogenous alkaline phosphatases (but not the heat stable secreted phosphatase).
The heat treated media is assayed for alkaline phosphatase by a luminescence assay using the luminescence reagent CSPD® (Tropix, Bedford, Mass.). A volume of 50 mL media is combined with 200 mL of CSPD cocktail and incubated for 60 minutes at room temperature. Luminesence is monitored using an ML2200 microplate luminometer (Dynatech). Luminescence reflects the level of activation of the fos reporter construct stimulated by the transiently expressed protein.
DNA-CaPOj. precipitate for 10cm. plate of cells
Ras expression plasmid (1 mg/μL) 10 μL DSE-SEAP Plasmid (1 mg/μL) 2 μL
Sheared Calf Thymus DNA (1 mg/μL) 8 μL
2M CaCl2 74 μL dH2θ 506 μL
2X HBS Buffer
280mM NaCl lOmM KCl
1.5mM Na2HPθ4 2H2θ
12mM dextrose 50mM HEPES
Final pH = 7.05
Luminesence Buffer (26mL)
Assay Buffer 20 mL Emerald Reagentό (Tropix) 2.5 mL
1 OOmM homoarginine 2.5 mL
CSPD Reagents (Tropix) 1.0 mL
Assay Buffer
Add 0.05M Na2CO3 to 0.05M NaHCO3 to obtain pH 9.5.
Make 1 mM in MgCl2
ASSAY 6
The processing assays employed are modifications of that described by DeClue et al [Cancer Research 51, 712-717, 1991].
K4B-Ras processing inhibition assay
PSN-1 (human pancreatic carcinoma) or viral-K4B-ras-transformed Ratl cells are used for analysis of protein processing. Subconfluent cells in 100 mm dishes are fed with 3.5 mL of media (methionine-free RPMI supplemented with 2% fetal bovine serum or cysteine- free/methionine-free DMEM supplemented with 0.035 mL of 200 mM glutamine (Gibco), 2% fetal bovine serum, respectively) containing the desired concentration of test compound, lovastatin or solvent alone. Cells treated with lovastatin (5-10 μM), a compound that blocks Ras processing in cells by inhibiting a rate-limiting step in the isoprenoid biosynthetic pathway, serve as a positive control. Test compounds are prepared as lOOOx concentrated solutions in DMSO to yield a final solvent concentration of 0.1%. Following incubation at 37°C for two hours 204 μCi/mL [^^SJPro-Mix (Amersham, cell labeling grade) is added.
After introducing the label amino acid mixture, the cells are incubated at 37°C for an additional period of time (typically 6 to 24 hours). The media is then removed and the cells are washed once with cold PBS. The cells are scraped into 1 mL of cold PBS, collected by centrifugation (10,000 x g for 10 sec at room temperature), and lysed by vortexing in 1 mL of lysis buffer (1%> Nonidet P-40, 20 mM HEPES, pH 7.5, 150 mM NaCl, 1 mM EDTA, 0.5% deoxycholate, 0.1% SDS, 1 mM DTT, 10 μg/mL AEBSF, 10 μg/mL aprotinin, 2 μg/mL leupeptin and 2 μg/mL antipain). The lysate is then centrifuged at 15,000 x g for 10 min at 4°C and the supernatant saved.
For immunoprecipitation of Ki4B-Ras, samples of lysate supernatant containing equal amounts of protein are utilized. Protein concentration is determined by the bradford method utilizing bovine serum albumin as a standard. The appropriate volume of lysate is brought to 1 mL with lysis buffer lacking DTT and 8 μg of the pan Ras monoclonal antibody, Y13-259, added. The protein antibody mixture is incubated on ice at 4°C for 24 hours. The immune complex is collected on pansorbin (Calbiochem) coated with rabbit antiserum to rat IgG (Cappel) by tumbling at 4°C for 45 minutes. The pellet is washed 3 times with 1 mL of lysis buffer lacking DTT and protease inhibitors and resuspended in 100 μl elution buffer (10 mM Tris pH 7.4, 1% SDS). The Ras is eluted from the beads by heating at 95°C for 5 minutes, after which the beads are pelleted by brief centrifugation (15,000 x g for 30 sec. at room temperature).
The supernatant is added to 1 mL of Dilution Buffer 0.1% Triton X- 100, 5 mM EDTA, 50 mM NaCl, 10 mM Tris pH 7.4) with 2 μg Kirsten-ras specific monoclonal antibody, c-K-ras Ab-1 (Calbiochem). The second protein/antibody mixture is incubated on ice at 4°C for 1-2 hours. The immune complex is collected on pansorbin (Calbiochem) coated with rabbit antiserum to rat IgG (Cappel) by tumbling at 4°C for 45 minutes. The pellet is washed 3 times with 1 mL of lysis buffer lacking DTT and protease inhibitors and resuspended in Laemmli sample buffer. The Ras is eluted from the beads by heating at 95°C for 5 minutes, after which the beads are pelleted by brief centrifugation. The supernatant is subjected to SDS-PAGE on a 12% acrylamide gel (bis-acrylamide:acrylamide, 1 :100), and the Ras visualized by fluorography.
hDJ processing inhibition assay
PSN-1 cells are seeded in 24-well assay plates. For each compound to be tested, the cells are treated with a minimum of seven concentrations in half-log steps. The final solvent (DMSO) concentration is 0.1%. A vehicle-only control is included on each assay plate. The cells are treated for 24 hours at 37°C / 5%> CO2- The growth media is then aspirated and the samples are washed
with PBS. The cells are lysed with SDS-PAGE sample buffer containing 5%> 2-mercaptoethanol and heated to 95 °C for 5 minutes. After cooling on ice for 10 minutes, a mixture of nucleases is added to reduce viscosity of the samples.
The plates are incubated on ice for another 10 minutes. The samples are loaded onto pre-cast 8% acrylamide gels and electrophoresed at 15 mA/gel for 3-4 hours. The samples are then transfeπed from the gels to PVDF membranes by Western blotting.
The membranes are blocked for at least 1 hour in buffer containing 2%> nonfat dry milk. The membranes are then treated with a monoclonal antibody to hDJ- 2 (Neomarkers Cat. # MS-225), washed, and treated with an alkaline phosphatase- conjugated secondary antibody. The membranes are then treated with a fluorescent detection reagent and scanned on a phosphorimager.
For each sample, the percent of total signal coπesponding to the unprenylated species of hDJ (the slower-migrating species) is calculated by densitometry. Dose-response curves and EC50 values are generated using 4- parameter curve fits in SigmaPlot software.
ASSAY 7
Rapl processing inhibition assay Protocol A:
Cells are labeled, incubated and lysed as described in Assay 6. For immunoprecipitation of Rapl, samples of lysate supernatant containing equal amounts of protein are utilized. Protein concentration is deter- mined by the bradford method utilizing bovine serum albumin as a standard. The appropriate volume of lysate is brought to 1 mL with lysis buffer lacking DTT and 2 μg of the Rapl antibody, Rapl/Krevl (121) (Santa Cruz Biotech), is added. The protein/antibody mixture is incubated on ice at 4°C for 1 hour. The immune complex is collected on pansorbin (Calbiochem) by tumbling at 4°C for 45 minutes. The pellet is washed 3 times with 1 mL of lysis buffer lacking DTT and protease inhibitors and
resuspended in 100 μl elution buffer (10 mM Tris pH 7.4, 1% SDS). The Rapl is eluted from the beads by heating at 95°C for 5 minutes, after which the beads are pelleted by brief centrifugation (15,000 x g for 30 sec. at room temperature).
The supernatant is added to 1 mL of Dilution Buffer (0.1 % Triton X-100, 5 mM EDTA, 50 mM NaCl, 10 mM Tris pH 7.4) with 2 μg Rapl antibody, Rapl/Krevl (121) (Santa Cruz Biotech). The second protein/antibody mixture is incubated on ice at 4°C for 1-2 hours. The immune complex is collected on pansorbin (Calbiochem) by tumbling at 4°C for 45 minutes. The pellet is washed 3 times with 1 mL of lysis buffer lacking DTT and protease inhibitors and resuspended in Laemmli sample buffer. The Rapl is eluted from the beads by heating at 95°C for 5 minutes, after which the beads are pelleted by brief centrifugation. The supernatant is subjected to SDS-PAGE on a 12% acrylamide gel (bis-acrylamide:acrylamide, 1 :100), and the Rapl visualized by fluorography.
Protocol B:
PSN-1 cells are passaged every 3-4 days in 10cm plates, splitting near- confluent plates 1 :20 and 1 :40. The day before the assay is set up, 5x 106 cells are plated on 15cm plates to ensure the same stage of confluency in each assay. The media for these cells is RPMl 1640 (Gibco), with 15% fetal bovine serum and lx Pen Strep antibiotic mix. The day of the assay, cells are collected from the 15cm plates by trypsinization and diluted to 400,000 cells/mL in media. 0.5mL of these diluted cells are added to each well of 24-well plates, for a final cell number of 200,000 per well. The cells are then grown at 37°C overnight.
The compounds to be assayed are diluted in DMSO in 1/2-log dilutions. The range of final concentrations to be assayed is generally 0.1-100 μM. Four concentrations per compound is typical. The compounds are diluted so that each concentration is lOOOx of the final concentration (i.e., for a 10 μM data point, a 10 mM stock of the compound is needed).
2 μL of each lOOOx compound stock is diluted into 1 mL media to produce a 2X stock of compound. A vehicle control solution (2 μL DMSO to lmL media), is utilized. 0.5 mL of the 2X stocks of compound are added to the cells.
After 24 hours, the media is aspirated from the assay plates. Each well is rinsed with lmL PBS, and the PBS is aspirated. 180 μL SDS-PAGE sample buffer (Novex) containing 5% 2-mercapto-ethanol is added to each well. The plates are heated to 100°C for 5 minutes using a heat block containing an adapter for assay plates. The plates are placed on ice. After 10 minutes, 20 μL of an RNAse/DNase mix is added per well. This mix is lmg/mL DNasel (Worthington Enzymes), 0.25 mg/mL Rnase A (Worthington Enzymes), 0.5 M Tris-HCl pH 8.0 and 50 mM MgCl2- The plate is left on ice for 10 minutes. Samples are then either loaded on the gel, or stored at -70°C until use.
Each assay plate (usually 3 compounds, each in 4-point titrations, plus controls) requires one 15-well 14% Novex gel. 25 μl of each sample is loaded onto the gel. The gel is run at 15 mA for about 3.5 hours. It is important to run the gel far enough so that there will be adequate separation between 21 kd (Rapl) and 29kd (Rab6).
The gels are then transfeπed to Novex pre-cut PVDF membranes for 1.5 hours at 30V (constant voltage). Immediately after transferring, the membranes are blocked overnight in 20mL Western blocking buffer (2% nonfat dry milk in
Western wash buffer (PBS + 0.1% Tween-20). If blocked over the weekend, 0.02% sodium azide is added. The membranes are blocked at 4°C with slow rocking.
The blocking solution is discarded and 20mL fresh blocking solution containing the anti Rapla antibody (Santa Cruz Biochemical SCI 482) at 1 : 1000 (diluted in Western blocking buffer) and the anti Rab6 antibody (Santa Cruz Biochemical SC310) at 1:5000 (diluted in Western blocking buffer) are added. The membranes are incubated at room temperature for 1 hour with mild rocking. The blocking solution is then discarded and the membrane is washed 3 times with Western wash buffer for 15 minutes per wash. 20mL blocking solution containing 1 : 1000 (diluted in Western blocking buffer) each of two alkaline phosphatase conjugated
antibodies (Alkaline phosphatase conjugated Anti-goat IgG and Alkaline phosphatase conjugated anti-rabbit IgG [Santa Cruz Biochemical]) is then added. The membrane is incubated for one hour and washed 3x as above.
About 2 mL per gel of the Amersham ECF detection reagent is placed on an overhead transparency (ECF) and the PVDF membranes are placed face-down onto the detection reagent. This is incubated for one minute, then the membrane is placed onto a fresh transparency sheet.
The developed transparency sheet is scanned on a phosphorimager and the Rapla Minimum Inhibitory Concentration is determined from the lowest concentration of compound that produces a detectable Rapla Western signal. The Rapla antibody used recognizes only unprenylated/unprocessed Rapla, so that the presence of a detectable Rapla Western signal is indicative of inhibition of Rapla prenylation.
Protocol C:
This protocol allows the determination of an EC50 for inhibition of processing of Rapla. The assay is run as described in Protocol B with the following modifications. 20 μl of sample is run on pre-cast 10-20% gradient acrylamide mini gels (Novex Inc.) at 15 mA/gel for 2.5-3 hours. Prenylated and unprenylated forms of Rap 1 a are detected by blotting with a polyclonal antibody (Rap 1 /Krev- 1 Ab# 121; Santa Cruz Research Products #sc-65), followed by an alkaline phosphatase- conjugated anti-rabbit IgG antibody. The percentage of unprenylated Rapla relative to the total amount of Rapla is determined by peak integration using Imagequant® software (Molecular Dynamics). Unprenylated Rapla is distinguished from prenyl- ated protein by virtue of the greater apparent molecular weight of the prenylated protein. Dose-response curves and EC50 values are generated using 4-parameter curve fits in SigmaPlot software.
ASSAY 8
In vivo tumor growth inhibition assay (nude mouse)
In vivo efficacy as an inhibitor of the growth of cancer cells may be confirmed by several protocols well known in the art. Examples of such in vivo efficacy studies are described by N. E. Kohl et al. (Nature Medicine, 1 :792-797 (1995)) and N. E. Kohl et al. (Proc. Nat. Acad. Sci. U.S.A., 91 :9141-9145 (1994)).
Rodent fibroblasts transformed with oncogenically mutated human Haras or Ki-ras (10 cells/animal in 1 mL of DMEM salts) are injected subcutaneously into the left flank of 8-12 week old female nude mice (Harlan) on day 0. The mice in each oncogene group are randomly assigned to a vehicle, compound or combination treatment group. Animals are dosed subcutaneously starting on day 1 and daily for the duration of the experiment. Alternatively, the farnesyl-protein transferase inhibitor may be administered by a continuous infusion pump. Compound, compound combination or vehicle is delivered in a total volume of 0.1 mL. Tumors are excised and weighed when all of the vehicle-treated animals exhibited lesions of 0.5 - 1.0 cm in diameter, typically 11-15 days after the cells were injected. The average weight of the tumors in each treatment group for each cell line is calculated.
EXAMPLES
Examples provided are intended to assist in a further understanding of the invention. Particular materials employed, species and conditions are intended to be further illustrative of the invention and not limitative of the reasonable scope thereof.
EXAMPLE 1
(±)-trα«s-7-[l-(3-chloropheny)-2-oxo-4-piperazinyl]-4-(4-cyanophenyl)-4,5,6,7- tetrahvdroimidazo l,5-α1pyridine (1) dihydrochloride
Step A: Preparation of l-(4-cyanobenzyl)imidazole
To a solution of 4-cyanobenzyl bromide (8.48 g, 43.3 mmol) in 30 mL of dimethylformamide was added imidazole (3.24 g, 47.6 mmol) and potassium carbonate (8.97 g, 64.9 mmol). After stiπing for 20 hours, the mixture was poured into EtOAc and washed with saturated NaHCO3 solution and brine, dried (Na2SO4), filtered, and concentrated in vacuo. The product was isolated as a white solid.
Step B: Preparation of l-[(tgrt-butyldimethylsilyl)oxy]-3-chloropropane To a solution of 3 -chloro-1 -propanol (4.025 g, 42.6 mmol) in 50 mL of dimethylformamide was added imidazole (4.34 g, 63.8 mmol) and tert- butyldimethylsilyl chloride (6.73 g, 44.7 mmol). The solution was stiπed at room temperature for 18 hours, then poured into hexane. The solution was washed with water, saturated NaHCO3 solution and brine, dried (Na2SO4), filtered, and concentrated in vacuo. The product was isolated as a colorless oil.
Step C: Preparation of l- (tgrt-butyldimethylsilyl)oxy]-3-iodopropane
To a solution of the product from Step B (7.61 g, 36.6 mmol) in 80 mL of acetone was added sodium iodide (8.23 g, 54.9 mmol), and the solution was heated to reflux. After two hours, another portion of sodium iodide (8.10 g, 54.0 mmol) was added, and the reaction was stiπed overnight. The solution was cooled to room temperature, poured into hexane and water, and the organic layer was washed with brine, dried (Na2SO ), filtered, and concentrated in vacuo. The product was isolated as a colorless oil.
Step D: Preparation of (±)-l-[4-((tert-butyldimethylsilyι)oxy)-l-(4- cvanophenyl)- 1 -butyljimidazole
To a solution of the product from Step A (3.907 g, 21.3 mmol) in 40 mL of tetrahydrofuran at -78°C was added lithium hexamethyldisilazide solution dropwise over 15 minutes (23.5 mL, 23.5 mmol, 1.0 M in THF). After one hour, the product from Step C was added (7.70 g, 25.6 mmol). The reaction was allowed to warm to 0°C over six hours, then poured into EtOAc/sat. NaHCO3 solution. The organic layer was washed with brine, dried (Na2SO ), filtered, and concentrated in vacuo. The crude product was purified by silica gel column chromatography (3-4% MeOH/CH2Cl ) to provide the desired product as a pale yellow oil.
Step E: Preparation of (±)- 1 -[ 1 -(4-cvanophenyl)-4-hvdroxy- 1 -butyl] imidazole
To a solution of the product from Step D (4.32 g, 12.2 mmol) in 20 mL of tetrahydrofuran at 0°C was added tetrabutylammonium fluoride solution (14.6 mL,
14.6 mmol, 1 M in THF). After 45 minutes, the reaction was poured into EtOAc/sat.
NaHCO3 solution, and the aqueous layer was extracted with EtOAc. The combined organic layers were washed with brine, dried (Na2SO ), filtered, and concentrated in vacuo. The crude product was purified by silica gel column chromatography (5-6%>
MeOH/CH2Cl2) to provide the desired product as a white solid.
Step F: Preparation of (± - 1 -[ 1 -(4-cyanophenyl)-4-oxo- 1 -butyl]imidazole To a solution of oxalyl chloride (0.122 mL, 1.40 mmol) in 5 mL of dichloromethane at -78°C was added dimethylsulfoxide (0.200 mL, 2.80 mmol).
After 10 minutes, a solution of the product from Step E (281 mg, 1.17 mmol) in 0.5 mL of dimethylsulfoxide and 1.5 mL of dichloromethane was added, followed by triethylamine (0.484 L, 3.50 mmol). The solution was allowed to warm to room temperature over 30 minutes, then poured into EtOAc/sat. NaHCO3 solution. The organic layer was washed with brine, dried (Na2SO4), filtered, and concentrated in vacuo to provide the titled product as a white solid.
Step G: Preparation of N-(3-chlorophenyl)ethylenedi amine hydrochloride
To a solution of 3-chloroaniline (30.0 mL, 284 mmol) in 500 L of dichloromethane at 0°C was added dropwise a solution of 4 N HCl in 1,4-dioxane (80 mL, 320 mmol HCl). The solution was warmed to room temperature, then concentrated to dryness in vacuo to provide a white powder. A mixture of this powder with 2-oxazolidinone (24.6 g, 282 mmol) was heated under nitrogen atmosphere at 160°C for 10 hours, during which the solids melted, and gas evolution was observed. The reaction was allowed to cool, forming the crude diamine hydrochloride salt as a pale brown solid.
Step H: Preparation of /V-(tert-butoxycarbonyl)-/V'-(3-chlorophenyl) ethylenedi amine
The amine hydrochloride from Step G (ca. 282 mmol, crude material prepared above) was taken up in 500 mL of THF and 500 mL of sat. aq. NaHCO3 soln., cooled to 0°C, and di-tert-butylpyrocarbonate (61.6 g, 282 mmol) was added. After 30 h, the reaction was poured into EtOAc, washed with water and brine, dried (Na2SO4), filtered, and concentrated in vacuo to provide the titled carbamate as a brown oil which was used in the next step without further purification.
Step I: Preparation of N-[2-(tert-butoxycarbamoyl)ethyl]-N-(3-chloro- phenyl)-2-chloroacetamide
A solution of the product from Step H (77 g, ca. 282 mmol) and triethylamine (67 mL, 480 mmol) in 500 mL of CH2CI2 was cooled to 0°C. Chloroacetyl chloride (25.5 mL, 320 mmol) was added dropwise, and the reaction was maintained at 0°C with stirring. After 3 h, another portion of chloroacetyl chloride (3.0 mL) was added dropwise. After 30 min, the reaction was poured into EtOAc (2 L) and washed with water, sat. aq. NH4CI soln, sat. aq. NaHCO3 soln., and brine. The solution was dried (Na2SO4), filtered, and concentrated in vacua to provide the chloroacetamide as a brown oil which was used in the next step without further purification.
Step J: Preparation of 4-(tert-butoxycarbonyl)- 1 -(3-chlorophenyl)-2- piperazinone
To a solution of the chloroacetamide from Step I (ca. 282 mmol) in 700 mL of dry DMF was added K2CO3 (88 g, 0.64 mol). The solution was heated in an oil bath at 70-75 °C for 20 hours, cooled to room temperature, and concentrated in vacuo to remove ca. 500 mL of DMF. The remaining material was poured into 33% EtOAc/hexane, washed with water and brine, dried (Na2SO4), filtered, and concentrated in vacuo to provide the product as a brown oil. This material was purified by silica gel chromatography (25-50% EtOAc/hexane) to yield pure product, along with a sample of product (ca. 65%> pure by HPLC) containing a less polar impurity.
Step K: Preparation of l-(3-chlorophenyl)-2-piperazinone Through a solution of Boc-protected piperazinone from Step J (17.19 g, 55.4 mmol) in 500 mL of EtOAc at -78°C was bubbled anhydrous HCl gas. The saturated solution was warmed to 0°C, and stirred for 12 hours. Nitrogen gas was bubbled through the reaction to remove excess HCl, and the mixture was warmed to room temperature. The solution was concentrated in vacuo to provide the hydro- chloride as a white powder. This material was taken up in 300 mL of CH2CI2 and treated with dilute aqueous NaHCO3 solution. The aqueous phase was extracted with CH2CI2 (8 x 300 mL) until tic analysis indicated complete extraction. The combined organic mixture was dried (Na2SO4), filtered, and concentrated in vacuo to provide the titled free amine as a pale brown oil.
Step L: Preparation of compound 1 dihydrochloride
A solution of the product from Step F (238 mg, 1.00 mmol), the product from Step K (209 mg, 1.00 mmol) and magnesium sulfate (250 mg) in 3.0 mL of chlorobenzene was heated to reflux under argon. After 30 minutes, the solution was cooled to room temperature, diluted with dichloromethane, filtered, and
concentrated in vacuo. The material was purified by silica gel chromatography (40-
70%) acetone/CH2Cl2) to provide the more polar of two isomers as a yellow solid.
This product was taken up in CH2CI2 and treated with excess 1 M HCl/ether solution, and concentrated in vacuo to provide the titled product dihydrochloride as a yellow powder.
FAB mass spectrum m/e 432.3 (M+l).
Analysis calculated for C24H22C1N5O»2.40 HC1-0.80 H2O:
C, 54.00; H, 4.91 ; N, 13.12; Found: C, 54.04; H, 4.90; N, 12.89.
EXAMPLE 2
(±)-trα«s-7-[l-(3-chloropheny)-2-oxo-4-piperazinyl]-4-(4-cyanophenyl)-3-methyl- 4,5,6,7-tetrahydroimidazo[l,5-α]pyridine (2) hydrochloride
Step A: Preparation of 1 -(4-cyanobenzyl)-2-methylimidazole
To a solution of 4-cyanobenzyl bromide (10.07 g, 51.4 mmol) in 40 mL of dimethylformamide was added 2-methylimidazole (4.62 g, 56.3 mmol) and potassium carbonate (10.70 g, 77.4 mmol). After stirring for four hours, the mixture was concentrated in vacuo, poured into EtOAc and washed with saturated NaHCO3 solution and brine, dried (Na SO4), filtered, and concentrated in vacuo. The product was isolated as a white solid.
Step B: Preparation of (±)-l-[4-((tert-butyldimethylsilyl)oxy)-l-(4- cyanophenyl)- 1 -butyl]-2-methylimidazole
To a solution of the product from Step A (5.03 g, 25.5 mmol) in 50
mL of tetrahydrofuran at -78°C was added lithium hexamethyldisilazide solution dropwise (28.0 mL, 28.0 mmol, 1.0 M in THF). After 30 minutes, the product from Step C of Example 1 was added (9.21 g, 30.7 mmol) as a solution in 10 mL of THF. The reaction was allowed to warm to 0°C over 2.5 hours, then poured into EtOAc/sat. NaHCO solution. The organic layer was washed with brine, dried (Na2SO4), filtered, and concentrated in vacuo. The crude product was purified by silica gel column chromatography (1.5-10% MeOH/CH2Cl2) to provide the desired product as an orange oil.
Step C: Preparation of (±)-l-[l-(4-cyanophenyl)-4-hydroxy-l-butyl]-2- methylimidazole
To a solution of the product from Step B (8.20 g, 22.2 mmol) in 30 mL of tetrahydrofuran at 0°C was added tetrabutylammonium fluoride solution (22.0 mL, 22.0 mmol, 1 M in THF). After stiπing overnight, the reaction was poured into EtOAc/sat. NaHCO3 solution, and the aqueous layer was extracted with EtOAc. The combined organic layers were washed with brine, dried (Na2SO4), filtered, and concentrated in vacuo. The crude product was purified by silica gel column chromatography (5-10% MeOH/CH2Cl2) to provide the desired product as an oil.
Step D: Preparation of (±)-l-[l-(4-cyanophenyl)-4-oxo-l-butyl]-2- methylimidazole
To a solution of oxalyl chloride (0.370 mL, 4.24 mmol) in 20 mL of dichloromethane at -78°C was added dimethylsulfoxide (0.650 mL, 9.20 mmol). After 10 minutes, a solution of the product from Step C (1.00 g, 3.92 mmol) in 5 mL dichloromethane was added, followed by triethylamine (1.50 mL, 10.8 mmol). The solution was allowed to warm to room temperature over 45 minutes, then poured into EtOAc/sat. NaHCO3 solution. The organic layer was washed with brine, dried (Na2SO ), filtered, and concentrated in vacuo to provide the titled product as a white solid.
Step E: Preparation of compound 2 hydrochloride
A solution of the product from Step D (726 mg, 2.86 mmol), the product from Step K of Example 1 (615 mg, 2.93 mmol) and magnesium sulfate (1.01 g) in 8.0 mL of chlorobenzene was heated to reflux under argon. After three hours, the solution was cooled to room temperature, diluted with dichloromethane, filtered, and concentrated in vacuo. The material was purified by silica gel chromatography (30-60% acetone/CH2θ2, then 5-10% MeOH/CH2Cl2) to provide the less polar of two isomers. This product was taken up in CH2CI2 and treated with excess 1 M HCl/ether solution, and concentrated in vacuo to provide the titled product hydrochloride as a white powder.
HRMS(ES) calculated for M+H+: 446.1742. Found 446.1746. Analysis calculated for C25H24C.N5O3-l.3O HC1-2.45 H2O:
C, 55.86; H, 5.66; N, 13.03; Found: C, 55.83; H, 5.78; N, 12.44.
EXAMPLE 3
(±)-c/s-7-[l-(3-chloropheny)-2-oxo-4-piperazinyl]-4-(4-cyanophenyl)-3-methyl- 4,5,6,7-tetrahydroimidazo[T,5-q]pyridine (3) hydrochloride
The product was isolated from the reaction described in Step E of Example 2 as the more polar of two isomers from silica gel chromatography (30-60% acetone/CH2Cl2, then 5-10% MeOH CH2Cl2). The product was taken up in CH2CI2 and treated with excess 1 M HCl/ether solution, and concentrated in vacuo to provide the titled product hydrochloride as a white powder.
HRMS(ES) calculated for M+H+: 446.1742. Found 446.1732.
Analysis calculated for C25H24ClN5θ3»1.70 HCl'2.20 H2O:
C, 54.83; H, 5.54; N, 12.79; Found: C, 54.97; H, 5.53; N, 12.40.
EXAMPLE 4
Preparation of (±)-c s-7-[(3,3-diphenylpropyl)amino]-4-(4-cyanophenyl)-3-methyl- 4.5,6,7-tetrahvdroimidazo|T,5-a]pyridine (4) dihydrochloride
The compound was prepared from the aldehyde from Step D of
Example 2 (230 mg, 0.91 mmol) using the procedure described in Step E of Example 2, except that 3,3-diphenylpropylamine was used in place of the amine from Step K of Example 1. The product was taken up in CH2CI2 and treated with excess 1 M HCl/ether solution, and concentrated in vacuo to provide the titled product dihydrochloride as a white solid.
Analysis calculated for C3θH3()N4»2.50 HC1»0.20 H2O:
C, 66.55; H, 6.13; N, 10.35; Found: C, 66.59; H, 6.13; N, 10.29.
EXAMPLE 5
(±)-CJ
'S-7- [N-(3 ,3 -diphenylpropyl)-N-(3-phenylpropyl)amino methyl-4,5,6,7-tetrahvdroimidazo[l,5-q]pyridine (5) hydrochloride
To a solution of compound 4 (41 mg, 0.076 mmol) and hydrocinnam- aldehyde (57 mg, 0.42 mmol) in 2 mL of 1 ,2-dichloroethane was added 4 =φowdered molecular sieves (58 mg), followed by sodium triacetoxyborohydride (60 mg, 0.28 mmol). After stirring overnight, the solution was poured into EtOAc, washed with sat. aq. NaHCO3 and brine, dried (Na2SO4), filtered, and concentrated in vacuo. The resulting product was taken up in CH2Cl2/MeOH and treated with excess 1 M HCl/ether solution, and concentrated in vacuo to provide the titled product hydrochloride as a white solid.
HRMS(ES) calculated for M+H+: 565.3326. Found 565.3335. Analysis calculated for C39H4θN4«0.90 HC .65 MeOH:
C, 75.05; H, 7.36; N, 8.61 ; Found: C, 75.03; H, 7.14; N, 9.92.
EXAMPLE 6
Preparation of (±)-7-[( 1 ,3-diphenylpropyl)amino]-4-(4-cyanophenyl)-3-methyl- 4,5,6,7-tetrahvdroimidazori,5-α]pyridine (6) isomer A dihydrochloride
Step A: Preparation of (±)-l,3-diphenylpropylamine
To a solution of 1,3-diphenyl-l-propanone (1.0 g, 5.0 mmol) in 40 mL of methanol was added ammonium acetate (7.5 g, 100 mmol) and sodium cyanoborohydride (1.2 g, 20 mmol). The solution was stiπed at room temperature for 20 hours, concentrated in vacuo, and partitioned between EtOAc and water. The organic layer was washed with water and extracted with 0.5% HCl solution. The aqueous phase was basified to pH~12 with 50% NaOH solution, and extracted with EtOAc. The combined organic layers were washed with brine, dried (Na2SO4), filtered, and concentrated in vacuo to provide the titled product.
Step B: Preparation of compound 6 isomer A dihydrochloride
The compound was prepared from the aldehyde from Step D of
Example 2 (340 mg, 1.51 mmol) using the procedure described in Step E of Example
2, except that the product of Step B was used in place of the amine from Step K of Example 1. Purification by preparative reverse phase HPLC gave a 1.2:1 mixture of two isomers, enriched in the more polar isomer A. The mixture was taken up in
CH2CI2 and treated with excess 1 M HCl/ether solution, and concentrated in vacuo to provide the titled product dihydrochloride as a white solid.
HRMS(ES) calculated for M+H+: 447.2543. Found 447.2552. Analysis calculated for C3oH3oN4 »2.35 HC1-0.05 H2O: C, 67.57; H, 6.13; N, 10.51;
Found: C, 67.63; H, 6.14; N, 10.15.
EXAMPLE 7
(±)-7-[(l ,3-diphenylpropyl)amino]-4-(4-cyanophenyl)-3-methyl-4,5,6,7- tetrahvdroimidazo[l,5-α1pyridine (7) isomer B dihydrochloride
The product was isolated from the reaction described in Example 6 as a 2.8: 1 mixture of two isomers, enriched in the less polar isomer B. The mixture was taken up in CH2CI2 and treated with excess 1 M HCl/ether solution, and concentrated in vacuo to provide the titled product dihydrochloride as a white solid. HRMS(ES) calculated for M+H+: 447.2543. Found 447.2549. Analysis calculated for C3θH3 )N4*2.10 HC1-0.35 H2O:
C, 68.05; H, 6.24; N, 10.58; Found: C, 68.09; H, 6.24; N, 9.79.
EXAMPLE 8
(±)-trα«s-7-[(3-phenylpropyl)amino]-4-(4-cyanophenyl)-3-methyl-4,5,6,7- tetrahvdroimidazo[l,5-α]pyridine (8) isomer A dihydrochloride
The compound was prepared from the aldehyde from Step D of Example 2 (290 mg, 1.29 mmol) using the procedure described in Step E of Example 2, except that 3-phenylpropylamine was used in place of the amine from Step K of Example 1. Purification by preparative reverse phase HPLC gave a 5.3: 1 mixture of two isomers, enriched in the more polar isomer A. The mixture was taken up in CH2CI2 and treated with excess 1 M HCl/ether solution, and concentrated in vacuo
to provide the titled product dihydrochloride as a white solid. HRMS(ES) calculated for M+H+: 371.2230. Found 371.2242. Analysis calculated for C24H26N4»1.95 HC1O.65 H2O: C, 63.58; H, 6.50; N, 12.36; Found: C, 63.62; H, 6.49; N, 12.27.
EXAMPLE 9
(±)-c s-7-[(3-phenylpropyl)amino]-4-(4-cyanophenyl)-3-methyl-4,5,6,7- tetrahydroimidazo[l,5-α]pyridine (9) isomer B dihydrochloride
The product was isolated from the reaction described in Example 8 as a 6.5:1 mixture of two isomers, enriched in the less polar isomer B. The mixture was taken up in CH2CI2 and treated with excess 1 M HCl/ether solution, and concentrated in vacuo to provide the titled product dihydrochloride as a white solid. HRMS(ES) calculated for M+H+: 371.2230. Found 371.2249. Analysis calculated for C24H2όN4'2.05 HCl'0.90 H2O:
C, 62.46; H, 6.52; N, 12.14; Found: C, 62.82; H, 6.53; N, 11.76.
EXAMPLE 10
(±)-trα«s-7-[(3-phenylbutyl)amino]-4-(4-cyanophenyl)-3-methyl-4,5,6,7- tetrahvdroimidazori,5-α]pyridine (10) isomer A dihydrochloride
The compound was prepared from the aldehyde from Step D of Example 2 (290 mg, 1.29 mmol) using the procedure described in Step E of Example 2, except that 4-phenylbutylamine was used in place of the amine from Step K of Example 1. Purification by preparative reverse phase HPLC gave a 1.2:1 mixture of two isomers, enriched in the more polar isomer A. The mixture was taken up in CH2CI2 and treated with excess 1 M HCl/ether solution, and concentrated in vacuo to provide the titled product dihydrochloride as a white solid. HRMS(ES) calculated for M+H+: 385.2387. Found 385.2386. Analysis calculated for C25H28N4'1.95 HCl'0.40 H2O:
C, 64.87; H, 6.70; N, 12.11 ; Found: C, 64.87; H, 6.70; N, 12.10.
EXAMPLE 11
(±)-c/s-7-[(3-phenylbutyl)amino]-4-(4-cyanophenyl)-3-methyl-4,5,6,7- tetrahvdroimidazo[l ,5-α]pyridine (11) isomer B dihydrochloride
The product was isolated from the reaction described in Example 10 (32 mg). The product was taken up in CH2CI2 and treated with excess 1 M HCl/ether solution, and concentrated in vacuo to provide the titled product dihydrochloride as a white solid. HRMS(ES) calculated for M+H
+: 385.2387. Found 385.2391. Analysis calculated for C25H28N4'2.00 HC1-0.45 H
2O:
C, 64.49; H, 6.69; N, 12.04; Found: C, 64.44; H, 6.68; N, 12.08.
EXAMPLE 12
(+)- or (-)- 's-7-[(3-Phenylbutyl)amino]-4-(4-cyanophenyl)-3-methyl-4,5,6,7- tetrahydroimidazof l,5-q]pyridine (12), Enantiomer A dihydrochloride
A sample of racemic compound 11 (19 mg in 0.8 mL of MeOH) was resolved by preparative chiral HPLC (Chiralpak AD 25 x 2 cm; 50%> ethanol/0.1%> diethylamine-hexane over 45 min; flow rate 6.0 mL/min; 250 nm). The faster eluting product was taken up in CH2CI2, treated with excess 1 M HCl/ether solution, and concentrated in vacuo to provide the titled product dihydrochloride as a white powder. Assay for enantiomeric purity (retention time = 6.32 min; Chiralpak AD 250 x 4.6 mm; 50% ethanol/0.1% diethylamine-hexane; flow rate 1.0 mL/min; 230 nm) indicated >99% enantiomeric excess.
HRMS(ES) calculated for M+H+: 385.2387. Found 385.2384. Analysis calculated for C25H28N4*2.20 HCl:
C, 64.60; H, 6.55; N, 12.06; Found: C, 64.84; H, 6.42; N, 11.67.
EXAMPLE 13
(-)- or (+)-c/s-7-[(3-Phenylbutyl)amino]-4-(4-cyanophenyl)-3-methyl-4,5,6,7- tetrahvdroimidazo[l,5-q]pyridine (13), Enantiomer B hydrochloride
The titled product was produced under the same conditions described in Example 12. Assay of the slower-eluting product for enantiomeric purity (retention time = 8.28 min; Chiralpak AD 250 x 4.6 mm; 50% ethanol/0.1% diethylamine- hexane; flow rate 1.0 mL/min; 230 nm) indicated >98% enantiomeric excess. HRMS(ES) calculated for M+H+: 385.2387. Found 385.2384. Analysis calculated for C25H28N4-1.65 HOI .45 H2O: C, 63.77; H, 6.97; N, 11.90;
Found: C, 64.08; H, 6.96; N, 10.91.
EXAMPLE 14
(±)-7-[((3-(3-methoxyphenyl)-3-phenyl)propyl)amino]-4-(4-cyanophenyl)-3-methyl- 4,5,6, 7-tetrahvdroimidazo[l,5-α1pyridine (14) isomers A and B dihydrochloride
Step A: Preparation of (±)-ethyl 2-cyano-3-(3-methoxyphenyl)-3- phenylpropionate
To a solution of ethyl trq«s-a-cyanocinnimate (2.01 g, 10.0 mmol) in 20 mL of dry THF at room temperature was added 3-methoxyphenylmagnesium bromide solution (24 mL, 12 mmol, 0.50 M in THF). The solution was refluxed for 30 minutes, then cooled to 0 °C. The reaction was poured into ice-cold 5% H2SO4 solution and extracted with EtOAc. The organic layer was washed with dilute NaHCO3 solution and brine, dried (Na SO4), filtered, and concentrated in vacuo. The crude product was purified by silica gel column chromatography (5-10% EtOAc/hexane) to provide the titled product.
Step B: Preparation of (±)-3-(3-methoxyphenyl)-3-phenylpropionitrile
To a solution of the product from Step A (2.74 g, 8.85 mmol) in 15 mL of ethylene glycol was added potassium hydroxide (850 mg, ca. 15 mmol). The reaction was stiπed under argon at reflux for three hours, then cooled to room temperature. The solution was diluted with water and extracted with EtOAc. The organic layer was washed with brine, dried (Na2SO4), filtered, and concentrated in vacuo to provide the titled product.
Step C: Preparation of (±)-3-(3-methoxyphenyl)-3-phenylpropylamine
To a solution of the product from Step B (1.5 g, 6.5 mmol) in 20 mL of dry THF at 0°C was added lithium aluminum hydride solution (26.0 mL, 26.0 mmol, 1 M in THF). The solution was warmed to 45 °C and stiπed for 20 hours. After ccoling to 0°C, water was added (1 mL), folowed by 50%> NaOH solution (4
mL). After 15 minutes, Na2SO4 was added, and the solution stiπed for an additional 15 minutes. The solution was filtered and concentrated in vacuo, then partitioned between EtOAc and 0.5 N HCl solution. The aqueous layer was washed with EtOAc, basified with 50%ι NaOH solution, and extracted with EtOAc. The combined organics were dried (Na2SO4), filtered, and concentrated in vacuo to provide the titled product.
Step D: Preparation of compound 14 dihydrochloride
The compound was prepared from the aldehyde from Step D of Example 2 (240 mg, 1.07 mmol) using the procedure described in Step E of Example 2, except that the product of Step C was used in place of the amine from Step K of Example 1. Purification by preparative reverse phase HPLC gave a 1 :2 mixture of isomers A and B, enriched in the less polar isomer B. The mixture was taken up in CH2CI2 and treated with excess 1 M HCl/ether solution, and concentrated in vacuo to provide the titled product dihydrochloride as a white solid. HRMS(ES) calculated for M+H+: 477.2649. Found 477.2650.
EXAMPLE 15
(±)-7-[((3-(3-methoxyphenyl)-3-phenyl)propyl)amino]-4-(4-cyanophenyl)-3-methyl- 4,5,6,7-tetrahvdroimidazo[l,5-q]pyridine (15) isomers B and C hydrochloride
The product was isolated from the reaction described in Step D of Example 14 as a 1.1 :1 mixture of isomers B and C, enriched in the more polar isomer
B. The mixture was taken up in CH2Cl2 MeOH and treated with excess 1 M HCl/ ether solution, and concentrated in vacuo to provide the titled product hydrochloride as a white solid.
HRMS(ES) calculated for M+H+: 477.2649. Found 477.2637.
Analysis calculated for C3iH32N4O»1.80 HCl* 1.30 MeOH:
C, 66.43; H, 6.73; N, 9.60; Found: C, 66.46; H, 6.71 ; N, 7.99.
EXAMPLE 16
(±)-cz's-7- [((3 -(3-methoxyphenyl)-3 -phenyl)propyl)amino] -4-(4-cyanophenyl)-3 - methyl-4,5,6,7-tetrahvdroimidazo[l,5-α]pyridine (16) isomer C dihydrochloride
The product was isolated from the reaction described in Step D of Example 14 . The mixture was taken up in CH2CI2 and treated with excess 1 M
HCl/ether solution, and concentrated in vacuo to provide the titled product dihydrochloride as a white solid.
HRMS(ES) calculated for M+H+: 477.2649. Found 477.2649.
Analysis calculated for C3iH32N4O«2.40 HCl'0.90 H2O: C, 64.15; H, 6.29; N, 9.65;
Found: C, 64.21; H, 6.29; N, 9.30.
EXAMPLE 17
(±)-/rα«s-7-[(benzyloxycarbonyl)amino]-4-(4-cyanophenyl)-3-methyl-4,5,6,7- tetrahvdroimidazo[l,5-α]pyridine (17)
The compound was prepared from the aldehyde from Step D of Example 2 (850 mg, 3.80 mmol) using the procedure described in Step E of Example 2, except that benzyl carbamate was used in place of the amine from Step K of Example 1. Purification by preparative reverse phase HPLC gave the titled product as a white solid.
HRMS(ES) calculated for M+H+: 387.1815. Found 387.1808. Analysis calculated for C23H22N4O2O.45 H2O:
C, 70.01; H, 5.85; N, 14.20; Found: C, 70.09; H, 5.82; N, 14.13.
EXAMPLE 18
(±)-trαns-7-amino-4-(4-cyanophenyl)-3-methyl-4,5,6,7-tetrahydroimidazo[l,5- α]pyridine (18) dihydrochloride
To a solution of compound 17 (160 mg, 0.414 mmol) in 5 mL of EtOAc was added 10% palladium on carbon (160 mg). The solution was stirred
at room temperature under an atmosphere of hydrogen for 16 hours, then purged with argon. The mixture was filtered through celite, the filter pad was washed with EtOAc, and the filtrate was concentrated in vacuo to produce the crude material (75 mg, 72%). A portion of this was taken up in CH2CI2 and treated with excess 1 M HCl/ether solution, and concentrated in vacuo to provide the titled product dihydrochloride as a white powder.
HRMS(ES) calculated for M+H+: 253.1448. Found 253.1447. Analysis calculated for C23H22N4θ2*2.10 HCl'0.05 H2O: C, 54.62; H, 5.56; N, 16.99; Found: C, 54.71 ; H, 5.52; N, 15.39.
EXAMPLE 19
(±)-trα«s-7-[(2,2-diphenyl-l-ethyl)carbamoyl]-4-(4-cyanophenyl)-3-methyl-4,5,6,7- tetrahvdroimidazo[l,5-α]pyridine (19) hydrochloride
To a solution of compound 18 (29.1 mg, 0.115 mmol) and 3,3- diphenylpropionic acid (31 mg, 0.137 mmol) in 1 mL of dimethylformamide was added 1 -hydroxybenzotriazole hydrate (20 mg, 0.148 mmol) and l-(dimethylamino- propyl)-3-ethylcarbodiimide hydrochloride (27 mg, 0.141 mmol), and triethylamine (0.032 mL, 0.23 mmol). After stirring overnight, the reaction was poured into EtOAc and washed with saturated NaHCO3 solution, and brine, dried (Na2SO4), filtered, and concentrated in vacuo. Purification by preparative reverse phase HPLC gave the desired material which was taken up in CH2CI2 and treated with excess 1 M
HCl/ether solution, and concentrated in vacuo to provide the titled product hydrochloride as a white solid.
HRMS(FAB) calculated for M+H+: 461.2341. Found 461.2360. Analysis calculated for C3θH28N4θ«1.45 HC1-0.10 H2O: C, 69.93; H, 5.80; N, 10.87;
Found: C, 69.99; H, 5.81; N, 10.65.
EXAMPLE 20
(±)-trα«s-7-[(3-benzyloxy- 1 -phenyl)carbamoyl]-4-(4-cyanophenyl)-3-methyl- 4,5,6,7-tetrahvdroimidazo[l,5-α]pyridine (20) hydrochloride
The compound was prepared from compound 18 (35.6 mg, 0.141 mmol) using the procedure described Example 19, except that 3-phenoxybenzoic acid was used in place of 3,3-diphenylpropionic acid. Purification by preparative reverse phase HPLC gave the desired material which was taken up in CH2CI2 and treated with excess 1 M HCl/ether solution, and concentrated in vacuo to provide the titled product hydrochloride as a white solid. HRMS(FAB) calculated for M+H+: 449.1978. Found 449.2001. Analysis calculated for C28H24N4θ2*l .05 HC1O.95 H2O: C, 66.73; H, 5.39; N, 11.12; Found: C, 66.76; H, 5.38; N, 11.25.