Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C303/00—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides
  • C07C303/26—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides of esters of sulfonic acids
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07B—GENERAL METHODS OF ORGANIC CHEMISTRY; APPARATUS THEREFOR
  • C07B59/00—Introduction of isotopes of elements into organic compounds ; Labelled organic compounds per se
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07B—GENERAL METHODS OF ORGANIC CHEMISTRY; APPARATUS THEREFOR
  • C07B59/00—Introduction of isotopes of elements into organic compounds ; Labelled organic compounds per se
  • C07B59/001—Acyclic or carbocyclic compounds
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07B—GENERAL METHODS OF ORGANIC CHEMISTRY; APPARATUS THEREFOR
  • C07B59/00—Introduction of isotopes of elements into organic compounds ; Labelled organic compounds per se
  • C07B59/002—Heterocyclic compounds
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C309/00—Sulfonic acids; Halides, esters, or anhydrides thereof
  • C07C309/63—Esters of sulfonic acids
  • C07C309/72—Esters of sulfonic acids having sulfur atoms of esterified sulfo groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton
  • C07C309/73—Esters of sulfonic acids having sulfur atoms of esterified sulfo groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton to carbon atoms of non-condensed six-membered aromatic rings
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C67/00—Preparation of carboxylic acid esters
  • C07C67/10—Preparation of carboxylic acid esters by reacting carboxylic acids or symmetrical anhydrides with ester groups or with a carbon-halogen bond
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D207/00—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom
  • C07D207/02—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
  • C07D207/04—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members
  • C07D207/08—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with hydrocarbon radicals, substituted by hetero atoms, attached to ring carbon atoms
  • C07D207/09—Radicals substituted by nitrogen atoms, not forming part of a nitro radical
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D211/00—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings
  • C07D211/04—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
  • C07D211/06—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members
  • C07D211/36—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
  • C07D211/60—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals
  • C07D211/62—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals attached in position 4
  • C07D211/66—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals attached in position 4 having a hetero atom as the second substituent in position 4
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D453/00—Heterocyclic compounds containing quinuclidine or iso-quinuclidine ring systems, e.g. quinine alkaloids
  • C07D453/02—Heterocyclic compounds containing quinuclidine or iso-quinuclidine ring systems, e.g. quinine alkaloids containing not further condensed quinuclidine ring systems
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07B—GENERAL METHODS OF ORGANIC CHEMISTRY; APPARATUS THEREFOR
  • C07B2200/00—Indexing scheme relating to specific properties of organic compounds
  • C07B2200/05—Isotopically modified compounds, e.g. labelled

Definitions

• the present invention relates in general to reagents having isotopic labels and in particular to tritiated reagents having greater stability than alkyl halides.
• Alkyl halides are versatile alkylating agents in organic chemistry. Methyl halides are particularly popular as alkylating agents. Representative of the methyl halides is methyl iodide, which in a pure state is a clear liquid that over time becomes brown as a result of decomposition to form various iodine- containing species. Methyl iodide is often stabilized through the addition of a solid metal such as mercury or copper to the storage vessel. As alkyl halides including methyl iodide are susceptible to actinic degradation and free radical decomposition, alkyl halide storage is often problematic. Nonetheless, aged alkyl halides are readily restored to usable form through a distillation process.
• isotopically labeled reagents tend to be small molecules that can be synthesized and used quickly.
• [Methyl- 3 H] methyl iodide is a common methylating reagent used in the synthesis of methyl-labeled radiochemicals.
• the rapid degradation of tritiated methyl iodide and other isotope-enriched alkyl halides means that these reagents must be used rapidly after synthesis.
• the requirement of rapid usage of isotopically labeled alkyl halides entails a scheduled batch production of the reagent followed by numerous reagent consumptive reactions being performed thereafter.
• a radioisotope labeled reagent includes a compound having the general formula (I),
• L ( a C b H 2 ) ⁇ a C H 3 (I) where a in each occurrence independently is a carbon mass number between 11 and 14 inclusive, b in each occurrence independently is a hydrogen mass number between 1 and 3 inclusive, such that a in each occurrence is not 12 simultaneously with b in each occurrence being 1;
• L is a leaving group R 1 SO 2 - O-, R'-S- 12 C1H 3 ( 12 C'H 2 ) deliberately-S-R 1 C(O)O-, NC-, (R') 3 P-, XMg- and Li-, where n is an integer between 0 and 3 inclusive, where X is chloro, bromo or iodine, where R 1 is H, aryl, a substituent containing aryl, C1-C 20 alkyl, a substituent containing C ⁇ -C 20 alkyl, C 2 -C 0 alkenyl, a substituent containing C 2 - C 20 alkenyl, C
• a process for preparing a compound of Formula I includes reacting an isotope enriched methyl halide, where L is a leaving group representative of a C b H 3 ( a C b H 2 ) n X with [L] ⁇ M p + or Mg, M is a metal ion or onium ion, Z+ is a cationic valency of M, Y- is an anionic valency of L, p is the absolute value of the anionic valency divided by the cation valency; preferably under anhydrous conditions in an aprotic solvent. Protic solvent and small amounts of water are tolerated in certain synthetic schemes.
• a method of isotopically alkylating a target molecule involves mixing the target molecule under reaction conditions with an effective amount of compound according to Formula I.
• the compound of Formula I is useful in isotopically labeling a target molecule and has the advantage of extended storage stability relative to the corresponding methyl iodide reagent.
• a commercial package includes a compound of Formula I together with instructions for the use thereof as an isotopic labeling reagent.
• the enhanced chemical stability of a compound of Formula I affords the possibility of performing isotopic labeling reactions remote from the reagent synthesis.
• the present invention has utility as an isotopic labeling reagent having superior storage properties as compared to the corresponding alkyl halide.
• the labeling reagents according to the present invention are operative to introduce carbon-11 [ ⁇ C], carbon-12 [ 12 C], carbon-13 [ 13 C] and carbon-14 [ ,4 C].
• the three hydrogen atoms making up a methyl group are 3 hydrogen- 1 [ H 3 ], 3 hydrogen-2 [ H 3 ] or 3 hydrogen-3 [ 3 H ] with the condition that at least one of the carbon or the three hydrogens of the methyl group are naturally occurring minor constituent isotopes.
• methylene (- a C b H 2 -) groups in higher alkyls share the isotopic identity of the thermal methyl group.
• deuterium is appreciated to be synonymous with hydrogen-2 and tritium synonymous with 3 H While according to the present invention all three hydrogen atoms that compose the methyl group are isotopically identical, it is appreciated that isotopically mixed hydrogen atoms are operative to form a methyl group.
• An isotope labeled reagent is a compound having a general formula
• a in each occurrence independently is a carbon atom mass number of between 11 and 14 inclusive
• b in each occurrence independently is a hydrogen atom mass number of between 1 and 3 inclusive
• at least one of a and b is a naturally occurring minor isotope constituent.
• An "isotope" for carbon is defined herein to include instances where the majority of carbon atoms have a carbon atomic mass number of other than carbon-12.
• An enriched isotope of hydrogen has as the majority hydrogen atomic mass number a value of 2 or 3.
• the carbon atomic mass number is 12 and all the hydrogen atomic mass numbers are 3.
• the leaving group L is selected to represent a chemically stable leaving group upon reaction with a target molecule nucleophile.
• the leaving group L is representative of: R'SO 2 -O- R -S-, 12 C1H 3 ( 12 C1H 2 ) complicat-S-, R'C(O)O-, NC-, (R') 3 P- XMg- and Li-.
• R 1 is hydrogen, aryl, a substituent containing aryl, C ⁇ -C 2 o alkyl, a substituent containing C ⁇ -C 20 alkyl, C 2 -C 0 alkenyl, a substituent containing C 2 -C2 0 alkenyl, C 2 -C 20 alkynyl, and a substituent containing C 2 -C 20 alkynyl. It is appreciated that the substituent, if present, is non-reactive towards intramolecular reaction within the compound.
• An aryl group according to the present invention is a monovalent monocyclic or bicyclic aromatic hydrocarbon radical of 6 to 10 ring atoms and illustratively includes naphthyl, a substituent containing naphthyl, phenyl, and a substituent containing phenyl with the proviso that a is not 13 and b is not 2 in the instance when the leaving group L is the mercapto aryl R'-S- C ⁇ -C 20 alkyl, C 2 -C 2 o alkenyl and C 2 -C 2 o alkynyl leaving groups operative herein include linear, branched, cyclic and bicyclic species.
• a substituent operative herein to modify an aryl, alkyl, alkenyl, or alkynyl replaces a hydrogen bonded to a carbon atom with each substituent independently being selected from alkyl, amino, cycloalkyl, halo, nitro, cyano, -OR 2 , acyl, and -COOR 3 .
• Alkyl substituents are C ⁇ -C 6 and preferably, C ⁇ -C 4 .
• Operative alkyl substituents illustratively include methyl, ethyl, n-propyl, isopropyl, butyl, isobutyl, terbutyl, pentyl, isopentyl, and hexyl.
• a cycloalkyl substituent operative herein is a C 5 or C 6 cyclopentyl or cyclohexyl species.
• a hetero cycloalkyl operative herein is selected from furanyl, tetrahydrofuranyl, epoxi, tetrahydropyranyl, dioxynyl, thiacyclopentyl, azeridyl pyrolidyl, piperadyl, morpholyl, and alkyl substituted forms thereof.
• Halo substituents operative herein are selected from fluoro, chloro, bromo and iodo.
• a substituent amino group is selected from NH 2 , NHRR 4 or NR 4 R 5 .
• R 2 is selected from hydrogen, C ⁇ -C 6 alkyl, C 5 or C 6 cycloalkyl, a heterocycloalkyl as described above, or a substituent containing phenyl.
• R 3 is hydrogen or C ⁇ - C 6 alkyl.
• R 4 and R 5 in each occurrence are independently selected from C ⁇ -C 6 alkyl, aryl as described above, C ⁇ -C 6 alkoxy, and C 6 phenoxy.
• isotopically labeled reagents include methyl sulfonic acid, methyl tosylate, methyl mesylate, methyl nosylate, dimethyl thioether, terbutyl methyl thioether, methyl benzoate, methilide triphenyl phosphene, methyl magnesium chloride, and methyl lithium.
• substituents of a leaving group L optionally incorporate a dye moiety illustratively including cyanine, rhodamine or other conjugated aromatic functionality to render inventive reagent an isotopic, as well as a spectroscopic labeling compound.
• each of the reagent compounds produced according to the present invention while having superior stability and handling properties as compared to isotopically labeled methyl halides, has limitations as to the reactions in which it is operative.
• methyl magnesium halides and methyl lithium are operative in aqueous environments only to form isotopically labeled methane whereas in anhydrous environments are suitable to perform labeling reactions well known to the art.
• Methylide phosphenes are operative in performing Wittig reactions, while in general inventive compounds are useful in performing nucleophilic substitution labeling reactions.
• M is a lithium ion, sodium ion, potassium ion, magnesium ion, calcium ion, barium ion, cesium ion, silver ion, zinc ion, copper ion, cobalt ion, iron ion, nickel ion, manganese ion, titanium ion, lead ion, chromium ion, vanadium ion, ruthenium ion, yttrium ion, lanthanoid ion, actinoid ion, tetrabutyl ammonium ion, tetraethylammonium ion, tetramethyl ammonium ion, triethylmethylammonium ion, triethylammonium ion, pyridinium ion, imidazolium ion, hydrogen ion, tetraethylphosphonium ion, tetramethylphosphonium ion
• the metal ion M is selected to produce a stable metal halide that facilitates separation of the inventive compound of Formula I therefrom.
• Preferred metal ions include silver and other transition metals.
• X as per the compound of Formula I is chloride, bromide or iodide.
• the valency of M z+ cation is preferably from 1 to 3, inclusive. In instances where the valency of M z+ is greater than 3, dissolution of ionic metal complex in solvent tends to occur as a result of increases in crystal lattice energy. As a result, in a more preferred embodiment, the valency of M z+ is 1.
• the valency Y- of L is similarly preferably from 1 to 3 with a valency of 1- being most preferred.
• P is the absolute value of the anionic valency to the Y- divided by the cation valency Z+ and thereby provide net charge neutrality.
• Methyl iodide for use in reaction Formulas IIA and IIB are produced by established techniques. 12 C 3 H 3 I is produced by a well-established technique. Dass, Desmond V.; Dempsey, Victor J.; Martin, R. Wayne; Odell, Allan L., Journal of Labelled Compounds and Radiopharmaceuticals (1987), 24(5), 517- 20; Liu, Yu-Ying; Chen, Journal of Labelled Compounds & Radiopharmaceuticals
• n C1H 3 methyl iodide is produced with the well-established reaction of carbon-11 dioxide with lithium aluminum hydride and subsequent hydrolysis with hydroiodic acid. 13 C with 1, 2 or 3 deuterium atoms present in the methyl group are produced as detailed in U.S. Patent 6,713,044 B2. Powdered magnesium and reagents of the form [L] Y" M C+ P according to the present invention are conventional to the art and in most cases commercially available reagents.
• reaction conditions to perform the reaction of Formulas IIA and IIB in order to produce a compound according to Formula I are known to the art for a specific reaction involving an alkyl halide and are in general characterized by reaction in an aprotic solvent under anhydrous conditions. Further guidance as to reaction conditions is found with reference to Grignard reagent synthesis and the Williamson ether synthesis.
• the reaction process of Formulas IIA and HB yield a product that has greater chemical stability than the corresponding alkyl halide while preserving the isotopic character of the alkyl halide.
• the resulting inventive reagents are further characterized by being nonvolatile and of lesser toxicity than the corresponding alkyl halide.
• a commercial package according to the present invention includes a compound of Formula I, preferably in purified form, together with instructions for the use of the compound as an isotopic labeling reagent.
• compounds of Formula I that represent esters of strong acids are well suited as reagents for labeling nucleophiles by way of an S N 2 reaction mechanism.
• Grignard reagents and alkyl lithium reagents are well suited for the production of ketones from carboxylic acids and carboxylic acid derivatives illustratively including amides and esters.
• esters it is appreciated that the resulting ketone in the presence of a Grignard reagent is unstable resulting in a methylated tertiary alcohol.
• Example 1 Typical preparation of [methyl- 12 C 3 H] methyl para- toluenesulfonate (III).
• Example 2 Synthesis of L-[N-methyl- 12 C 3 H] quinuclidinyl benzilate methyl chloride (IV) with [methyl- 12 C 3 H]methyl para-toluenesulfonate (III).
• GHLF n-butanol -acetic acid- water, 4:1:1
• HPLC Zorbax SB-C8, methanol-1% TEAA pH4, gradient
• the specific activity is determined to be 82.0 Ci/mmol by mass spectral analysis, and the radiochemical purity determined by HPLC as above is 99%.
• Example 3 Typical preparation of [methyl- 3 H]methyl para- nitrobenzenesulfonate (V).
• HPLC on ODS show that 91% of the activity coeluted with cold standard.
• a portion is purified on HPLC (Zorbax SB-C18, acetonitrile-0.1% trifluoroacetic acid, gradient) to give [Methyl ester- 12 C 3 H]carfentanil (VI).
• the specific activity is determined to be 80.0 Ci/mmol by mass spectral analysis, and the radiochemical purity determined by HPLC as above is 99%.
• Raclopride is prepared at 80.5 Ci/mmol by heating the reaction to 70°C in DMSO.
• the methyl nosylate (V) is able to be dispensed by volume, and the solvent removed to leave the reagent ready for use in the reaction vessel.
• the stoichiometry of the reaction is able to be carefully controlled to minimize di methylation.
• the methylating ability of methyl iodide vs. methyl nosylate is compared in a competition experiment.
• the potassium salt of 2-naphthylacetic acid is stirred in dimethyl formamide with one equivalent of cold methyl iodide and one equivalent of tritiated methyl nosylate (V).
• the purified material is determined to be 86 Ci/mmol.
• the nucleophile had been preferentially methylated by the tritiated methyl nosylate (V) with only a small fraction reacting instead with the unlabeled methyl iodide.
• Patents and publications mentioned in the specification are indicative of the levels of those skilled in the art to which the invention pertains. These patents and publications are incorporated herein by reference to the same extent as if each individual application or publication was specifically and individually incorporated herein by reference.

Landscapes

• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
• Hydrogenated Pyridines (AREA)
• Nitrogen Condensed Heterocyclic Rings (AREA)
• Pyrrole Compounds (AREA)

Priority Applications (8)

Applications Claiming Priority (2)

Related Child Applications (2)

Publications (2)

Family

ID=33510232

Family Applications (1)

Country Status (8)

Cited By (2)

Families Citing this family (1)

Family Cites Families (9)

• 2004
  • 2004-05-28 ES ES04753682T patent/ES2714780T3/es not_active Expired - Lifetime
  • 2004-05-28 JP JP2006515007A patent/JP5204401B2/ja not_active Expired - Lifetime
  • 2004-05-28 US US10/559,047 patent/US8058464B2/en not_active Expired - Lifetime
  • 2004-05-28 HU HUE04753682A patent/HUE044033T2/hu unknown
  • 2004-05-28 DK DK04753682.6T patent/DK1633703T3/en active
  • 2004-05-28 CA CA2527809A patent/CA2527809C/en not_active Expired - Lifetime
  • 2004-05-28 WO PCT/US2004/016898 patent/WO2004108636A2/en not_active Ceased
  • 2004-05-28 EP EP04753682.6A patent/EP1633703B1/en not_active Expired - Lifetime
• 2011
  • 2011-09-13 US US13/231,041 patent/US8329934B2/en not_active Expired - Fee Related
• 2012
  • 2012-10-04 US US13/644,925 patent/US8987501B2/en not_active Expired - Lifetime

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events