AU717260B2 - Osteogenetic promoting pharmaceutical composition - Google Patents

Description

WO 96/39134 PCT/JP96/01506

DESCRIPTION

OSTEOGENETIC PROMOTING PHARMACEUTICAL

COMPOSITION

Technical Field The present invention relates to a pharmaceutical composition having an enhanced osteogenetic promoting activity comprising a non-peptide osteogenetic promoting substance and a biodegradable polymer, which is a useful agent for treating and/or preventing bone diseases.

i0 10 Background Art The bone diseases bone fractures) can occur in all classes of people due to various causes of sports and traffic accidents. And, since it usually takes a long time to heal them, the bone diseases bring significantly hamperings to the patient's normal daily life. In recent years, the number of osteoporosis patients has increased with the aging of population. So, an incidence of limb bone fractures associated with osteoporosis has markedly increased in proportion to it. Femoral neck bone fracture, 20 in particular, necessitates long-term hospitalization and often brings about internal complications including dementia caused by long-term hospitalization, and pose major social and economic problems. It is an urgent task to allow bone fracture patients to be early discharged from the hospital.

Bone fracture healing is a form of wound healing characterized by local occurrence and progression. Usually, various local factors function well at the site of fracture to promote the healing in vivo. Such factors include peptide-type bioactive substances such as bone morphogenetic proteins (BMPs) and transforming growth factors (TGFs), which have been reported to promote osteogenesis in animal models "Proceedings of the National Academy of Sciences, USA, vol. 87, pp. 2220-2224 (1990), and Endocrinology, vol. 124, pp. 2991-2993 (1989)".

2 With regard to non-peptide osteogenetic promoting substance, for example, prostaglandin

A

1 derivatives, vitamin D 3 derivatives, benzylphosphonic acid derivatives, phenolsulfophthalenic acid derivatives have been reported.

The above-mentioned peptide-type bioactive substances are peptides or proteins exceeding 5,000 in molecular weight, and are rapidly metabolized in vivo and lacking stability. With this in mind, some preparations have been produced in an attempt to obtain satisfactory stability, but all failed to achieve sufficient osteogenetic promoting activity, and there are no preparations satisfactory as to quality etc. "Clinical Orthopaedics and Related Research, vol. 278, pp. 274-285". Also, the above-mentioned nonpeptide osteogenetic promoting substance are not clinically effective in terms of osteogenetic promoting activity for bone fracture healing.

For these reasons, there is strong demand for a highquality agent for treating bone disease that is highly S stable, safe and active, and that is clinically effective 20 in long-term treatment of bone fractures.

Disclosure of Invention The present inventors made extensive investigation to resolve these problems, and found that an agent for 25 treating bone disease comprising a non-peptide osteogenetic promoting substance and a biodegradable polymer unexpectedly serves very well to promote bone fracture healing, with an enhanced osteogenetic promoting activity of the non-peptide osteogenetic promoting substance, than when administered alone. The present inventors made further investigation based on this finding, and developed the present invention.

Accordingly, the present invention relates to: 1) a pharmaceutical composition which is a sustainedrelease composition comprising a non-peptide osteogenetic promoting substance and a biodegradable polymer, 3 a pharmaceutical composition according to which further comprises a phosphoric acid or its salt, a pharmaceutical composition according to wherein the non-peptide osteogenetic promoting substance is non-steroid, a pharmaceutical composition according to which is used for local administration, a pharmaceutical composition according to which is used for promotion of bone fracture healing, a pharmaceutical composition according to wherein the non-peptide osteogenetic promoting substance is a compound represented by the formula

B

0*0* (CH2)k A

(I)

S.i *se wherein ring A is an optionally substituted benzene ring S'25 R is a hydrogen atom or an optionally substituted 25 hydrocarbon group; B is an optionally esterified or Samidated carboxyl group; X is -CH(OH)- or k is 0 or 1; and k' is 0, 1 or 2, or its salt, a pharmaceutical composition according to (6) 0.0 wherein the ring A is a benzene ring which may be substituted by 1 or 2 substituents selected from the group consisting of a halogen, C1- 10 alkyl, C 1 10 alkoxy, -0-

(CH

2 wherein n is 1 to 3 and C-o 10 alkylthio, a pharmaceutical composition according to wherein B is -CON(R 1

(R

2 wherein R 1 and R 2 are independently a hydrogen atom, an optionally substituted 4 hydrocarbon group or an optionally substituted 5 to 7 membered heterocyclic group, a pharmaceutical composition according to wherein R 1 is hydrogen atom or a Ci-lo alkyl group, and R 2 is a phenyl or phenyl-Ci- 3 alkyl group which may be substituted by a halogen, C1-6 alkoxy, mono- or di-C 1 ialkoxyphosphoryl, mono- or di-C-6 alkoxyphosphoryClC 1 3 alkyl, -CH 2

(CH

2 )p wherein p is 2 to 4 or C 1 -6 0 O alkoxycarbonyl or (ii) a 5- or 6-membered heterocyclic group containing 1 or 2 nitrogen atom(s) or 1 nitrogen atom and 1 sulfur atom, which may be substituted by a phenyl, (10) a pharmaceutical composition according to .1.5 wherein R is a hydrogen atom, C 1 -e alkyl group or phenyl group, .0 (11) a pharmaceutical composition according to 0 wherein k is 1 and k' is 0, (12) a pharmaceutical composition according to 40 wherein the non-peptide osteogenetic promoting substance is an optically active compound represented by the formula:

/OR

4 000 ONH- K CH 2

P

*00* O

S

o o o0 O

R

3 wherein R 3 is a lower alkyl group; and R 4 and R 5 are 0 independently a lower alkyl group or bind together to form a lower alkylene group, (13) a pharmaceutical composition according to (12), wherein R 3

R

4 and R 5 are independently a C 1 6 alkyl group, (14) a pharmaceutical composition according to wherein the compound is (2R, (diethoxyphosphorylmethyl)phenyl]-1,2,4,5-tetrahydro-4c- c- r- 5 methyl-7, 8 -methylenedioxy-5-oxo-3-benzothiepine-2carboxamide, (17) a pharmaceutical composition according to wherein the ratio by weight of the biodegradable polymer based on the non-peptide osteogenetic promoting substance is about 1 to 100 times, (18) a pharmaceutical composition according to which comprises (diethoxyphosphorylmethyl)phenyl]-1,2,4,5-tetrahydro-4methyl-7, 8 -methylenedioxy-5-oxo-3-benzothiepine-2carboxamide, a biodegradable polymer, (19) a pharmaceutical composition according to (16) S which further comprises a phosphoric acid or its salt, (20) a pharmaceutical composition according to (17), wherein the phosphoric acid or its salt is sodium phosphate, (21) a pharmaceutical composition according to (16), wherein the content ratio of diethoxyphosphorylmethyl)phenyl]-1,2,4,5-tetrahydro-4- 0 methyl-7,8-methylenedioxy-5-oxo-3-benzothiepine-2carboxamide based on the biodegradable polymer is about to 30% and the content ratio of sodium phosphate based on 2 R,4S)-(-)-[N-(diethoxyphosphorylmethyl)phenyl]- 1,2,4,5-tetrahydro-4-methyl-7,8-methylenedioxy-5-oxo-3benzothiepine-2-carboxamide and the biodegradable polymer is about 0.1 to 20% (22) a pharmaceutical composition according to (16) wherein the biodegradable polymer is a lactic acid-glycolic acid copolymer, (23) a pharmaceutical composition according to (20) wherein the ratio of lactic aicd/glycolic acid is about 90/10 to 50/50 and the weight-average molecular weight is about 8000 to 50000, (24) a pharmaceutical composition according to wherein the biodegradable polymer is an aliphatic polyester, 6 (23) a pharmaceutical composition according to (22) wherein the aliphatic polyester is a lactic acid-glycolic acid copolymer, (24) a pharmaceutical composition according to which is in the form of a suspension, a pharmaceutical composition according to which is used for injection, (26) use of a pharmaceutical composition according to for manufacturing an agent for treating or preventing bone diseases, (27) use of a biodegradable polymer to enhance osteogenetic promoting activity of a non-peptide osteogenetic promoting S. substance, (28) method for treating or preventing bone diseases in mammals which comprises administering to a subject in need an T5 effective amount of a pharmaceutical composition according to 0 (29) method according to wherein the bone diseases are bone fractures, and (30) an agent for treating or preventing bone diseases with enhanced osteogenetic promoting activity, which comprises a non-peptide osteogenetic promoting substance and a biodegradable polymer, and so on.

Useful non-peptide osteogenetic promoting substances of the present invention include the sulfur-containing 25 heterocyclic compounds such as (Diethoxyphosphorylmethyl)phenyl]-1,2,4,5-tetrahydro-4methyl-7,8-methylenedioxy-5-oxo-3-benzothiepine-2- S carboxamide.or salts thereof described in US5071841, US5158943 and JP5294960, the benzopyrane derivatives such as N-( 4 -Dimethoxyphosphorylmethylphenyl)-4-oxo-4H-lbenzopyrane-2-carboxamide or salts thereof described in EP625522, the phosphonic acid derivatives such as Diethyl 4-(7-cyclohexyl-3, 4 -dihydro-2-naphthalenecarboxamide)benzylphosphonate or salts thereof described in W096/01267, the prostaglandin Al derivatives described in Journal of Pharmacology and Experimental Therapeutics, vol. 258, pp.

WO 96/39134 PCT/JP96/01506 7 1120-1126 (1991), the vitamin

D

3 derivatives described in the Bioorganic Medicinal Chemistry Letters, vol. 3, pp.

1815-1819 (1993), the benzylphosphonic acid derivatives described in EP524023, the bisphosphonic acids described in Bone, vol. 13, pp. 249-255 (1992), and the vitamin

K

2 derivatives described in Biochemical and Biophysical Research Communications, vol. 187, pp. 814-820 (1992).

The pharmaceutical composition of the present invention may contain one or more non-peptide osteogenetic promoting substances described above for active ingredient.

In the above-mentioned non-peptide osteogenetic promoting substances, a compound represented by the following formula or a salt thereof is preferably used for the present invention.

A compound of the formula

B

(CH2)k A

(I)

x__

R

wherein ring A is an optionally substituted benzene ring; R is a hydrogen atom or an optionally substituted hydrocarbon group; B is an optionally esterified or amidated carboxyl group; X is -CH(OH)- or k is 0 or 1; and k' is 0, 1 or 2, or its salt.

With respect to the formula the substituent of the substituted benzene represented by ring A is exemplified by halogen atoms, nitro groups, optionally substituted alkyl groups, optionally substituted hydroxyl groups, optionally substituted thiol groups, optionally substituted amino groups, acyl groups, mono- or di-alkoxyphosphoryl groups, phosphono groups, optionally substituted aryl WO 96/39134 PCT/JP96/01506 8 groups, optionally substituted aralkyl groups and optionally substituted aromatic heterocyclic groups. Of these substituents, 1 to 4, preferably 1 or 2, whether identical or not, may be present on the benzene ring.

The halogen atoms include fluorine, chlorine, bromine and iodine.

The alkyl groups of the optionally substituted alkyl groups include alkyl groups having 1 to 10 carbon atoms such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, pentyl, isopentyl, neopentyl, hexyl, heptyl, octyl, nonyl and decyl, and cycloalkyl groups having 3 to 7 carbon atoms such as cyclopropyl, cyclobutyl, cyclohexyl and cycloheptyl. These alkyl groups may be substituted by 1 to 3 substituents selected from halogen atoms fluorine, chlorine, bromine, iodine), hydroxyl groups, alkoxy groups having 1 to 6 carbon atoms methoxy, ethoxy, propoxy, butoxy, hexyloxy), mono- or di- CI-6 alkoxyphosphoryl groups methoxyphosphoryl, ethoxyphosphoryl, dimethoxyphosphoryl, diethoxyphosphoryl) and phosphono groups.

The substituted alkyl groups include trifluoromethyl, trifluoroethyl, trichloromethyl, hydroxymethyl, 2-hydroxyethyl, methoxyethyl, l-methoxyethyl, 2-methoxyethyl, 2,2diethoxyethyl, 2 -diethoxyphosphorylethyl, phosphonomethyl and so on.

The substituted hydroxyl groups include alkoxy groups, alkenyloxy groups, aralkyloxy groups, acyloxy groups, aryloxy groups and so on. Preferable alkoxy groups are alkoxy groups having 1 to 10 carbon atoms methoxy, ethoxy, propoxy, butoxy, tert-butoxy, pentyloxy, hexyloxy, heptyloxy, nonyloxy) and cycloalkoxy groups having 4 to 6 carbon atoms cyclobutoxy, cyclopentoxy, cyclohexyloxy). Preferable alkenyloxy groups are alkenyloxy groups having 2 to 10 carbon atoms such as allyloxy, crotyloxy, 2 -pentenyloxy, 3-hexenyloxy, 2-cyclopentenylmethoxy and 2 -cyclohexenylmethoxy. Preferable WO 96/39134 PCT/JP96/01506 9 aralkyloxy groups are aralkyloxy groups having 6 to 19 carbon atoms, with greater preference given to C6- 1 4 aryl-C1- 4 alkyloxy groups benzyloxy, phenethyloxy). Preferable acyloxy groups are alkanoyloxy groups such as those having 2 to 10 carbon atoms acetyloxy, propionyloxy, n-butyryloxy, hexanoyloxy). Preferable aryloxy groups are aryloxy groups having 6 to 14 carbon atoms phenoxy, biphenyloxy). Further, these groups may be substituted by 1 to 3 substituents selected from the above-mentioned halogen atoms, hydroxyl groups, alkoxy groups having 1 to 6 carbon atoms, mono- or di-C- 6 alkoxyphosphoryl groups, etc. The substituted hydroxyl groups include trifluoromethoxy, 2 ,2, 2 -trifluoroethoxy, difluoromethoxy, 2-methoxyethoxy, 4-chlorobenzyloxy and 2-(3,4dimethoxyphenyl)ethoxy, and so on.

The substituted thiol groups include alkylthio groups, aralkylthio groups and acylthio groups. Preferable alkylthio groups are alkylthio groups having 1 to 10 carbon atoms methylthio, ethylthio, propylthio, butylthio, pentylthio, hexylthio, heptylthio, nonylthio) and cycloalkylthio groups having 4 to 6 carbon atoms cyclobutylthio, cyclopentylthio, cyclohexylthio).

Preferable aralkylthio groups are aralkylthio groups having 7 to 19 carbon atoms, more preferably C6- 1 4 aryl-C-4 alkylthio groups such as benzylthio and phenethylthio.

Preferable acylthio groups are alkanoylthio groups such as those having 2 to 10 carbon atoms acetylthio, propionylthio, n-butyrylthio, hexanoylthio). Further, these substituted thiol groups may be substituted by 1 to 3 substituents selected from the above-mentioned halogen atoms, hydroxyl groups, alkoxy groups having 1 to 6 carbon atoms, mono- or di-Cj-6 alkoxyphosphoryl groups, etc.

Specifically, the substituted thiol groups include trifluoromethylthio, 2,2,2-trifluoroethylthio, 2-methoxyethylthio, 4-chlorobenzylthio, 3,4-dichlorobenzylthio, 4-fluorobenzylthio, 2 -(3,4-dimethoxyphenyl)ethylthio, and so on.

WO 96/39134 PCT/JP96/01506 10 As substituents of the substituted amino groups, there may be used 1 or 2 identical or different substituents selected from the above-mentioned alkyl groups having 1 to carbon atoms, alkenyl groups having 2 to 10 carbon atoms allyl, vinyl, 2-penten-1-yl, 3-penten-1-yl, 2-hexen- 1-yl, 3-hexen-l-yl, 2-cyclohexenyl, 2 -cyclopentenyl, 2methyl-2-propen-l-yl, 3-methyl-2-buten--yl), aryl groups having 6 to 14 carbon atoms phenyl, naphthyl) and aralkyl groups having 7 to 19 carbon atoms benzyl).

These substituents may be substituted by the abovementioned halogen atoms, alkoxy groups having 1 to 6 carbon atoms, mono- or di-C 1 -6 alkoxyphosphoryl groups, phosphono groups, etc.. Specifically, the substituted amino groups include methylamino, dimethylamino, ethylamino, diethylamino, dibutylamino, diallylamino, cyclohexylamino, phenylamino, N-methyl-N-phenylamino, N-methyl-N-(4chlorobenzyl)amino and N,N-di(2-methoxyethyl)amino, and so on.

The acyl groups include organic carboxylic acid acyl groups and sulfonic acid acyl groups with a hydrocarbon group having 1 to 6 carbon atoms methyl, ethyl, npropyl, hexyl, phenyl). Useful organic carboxylic acyl groups are formyl, C1-o 10 alkyl-carbonyl groups acetyl, propionyl, butyryl, valeryl, pivaloyl, hexanoyl, octanoyl, cyclobutanecarbonyl, cyclohexanecarbonyl, cycloheptanecarbonyl),

C

2 1 0 alkenyl-carbonyl groups crotonyl, 2-cyclohexenecarbonyl), C6- 14 aryl-carbonyl groups benzoyl), C 7 1 9 aralkyl-carbonyl groups benzylcarbonyl, benzhydrylcarbonyl), 5- or 6membered aromatic heterocyclic carbonyl groups (e.g, nicotinoyl, 4-thiazolylcarbonyl) and 5- or 6-membered aromatic heterocyclic acetyl groups 3-pyridylacetyl, 4thiazolylacetyl). Useful sulfonic acyl groups having 1 to 6 carbon atoms are methanesulfonyl and ethanesulfonyl.

These acyl groups may be substituted by 1 to 3 substituents selected from the above-mentioned halogen atoms, hydroxyl WO 96/39134 PCT/JP96/01506 11 groups, alkoxy groups having 1 to 6 carbon atoms, amino groups, etc.. Specifically, the substituted acyl groups include trifluoroacetyl, trichloroacetyl, 4-methoxybutyryl, 3-cyclohexyloxypropionyl, 4-chlorobenzoyl and 3,4-dimethoxybenzoyl, and so on.

The mono- or di-alkoxyphosphoryl groups include mono-

C

1 -6 alkoxyphosphoryl groups such as methoxyphosphoryl, ethoxyphosphoryl, propoxyphosphoryl, isopropoxyphosphoryl, butoxyphosphoryl, pentyloxyphosphoryl and hexyloxyphosphoryl, and di-C 1 -6 alkoxyphosphoryl groups such as dimethoxyphosphoryl, diethoxyphosphoryl, dipropoxyphosphoryl, diisopropoxyphosphoryl, dibutoxyphosphoryl, dipentyloxyphosphoryl and dihexyloxyphosphoryl, with preference given to di-C 1 -6 alkoxyphosphoryl groups such as dimethoxyphosphoryl, diethoxyphosphoryl, dipropoxyphosphoryl, diisopropoxyphosphoryl, ethylenedioxyphosphoryl, dibutoxyphosphoryl, etc..

The aryl groups of the optionally substituted aryl groups include aryl groups having 6 to 14 carbon atoms such as phenyl, naphthyl and anthryl. These aryl groups may be substituted by 1 to 3 substituents selected from the abovementioned alkyl groups having 1 to 10 carbon atoms, halogen atoms, hydroxyl groups, alkoxy groups having 1 to 6 carbon atoms, etc.. Specifically, the substituted aryl groups include 4-chlorophenyl, 3,4-dimethoxyphenyl, 4-cyclohexylphenyl and 5,6,7,8-tetrahydro-2-naphthyl.

The aralkyl groups of the optionally substituted aralkyl groups include aralkyl groups having 7 to 19 carbon atoms such as benzyl, naphthylethyl and trityl. These aralkyl groups may be substituted by 1 to 3 substituents selected from the above-mentioned alkyl groups having 1 to carbon atoms, halogen atoms, hydroxyl groups, alkoxy groups having 1 to 6 carbon atoms, etc. on the aromatic ring. Specifically, the substituted aralkyl groups include 4-chlorobenzyl, 3,4-dimethoxybenzyl, 4-cyclohexylbenzyl and 5,6,7,8-tetrahydro-2-naphthylethyl.

WO 96/39134 PCT/JP96/01506 12 The aromatic heterocyclic groups of the optionally substituted aromatic heterocyclic groups include 5- to 6membered aromatic heterocyclic groups having 1 to 4 atoms of nitrogen, oxygen and/or sulfur, such as furyl, thienyl, imidazolyl, thiazolyl, oxazolyl and thiadiazolyl. These aromatic heterocyclic groups may be substituted by 1 to 3 substituents selected from the above-mentioned alkyl groups having 1 to 10 carbon atoms, halogen atoms, hydroxyl groups, alkoxy groups having 1 to 6 carbon atoms, etc..

Provided that two alkyl groups are present as mutually adjoining substituents on the benzene ring A, they may bind together to form an alkylene group represented by the formula: -(CH2)m- wherein m is an integer from 3 to trimethylene, tetramethylene, pentamethylene).

Provided that two alkoxy groups are present as mutually adjoining substituents on the benzene ring A, they may bind together to form an alkylenedioxy group represented by the formula: -O-(CH2)n-O- wherein n is an integer from 1 to 3 methylenedioxy, ethylenedioxy, trimethylenedioxy).

In these cases, a 5- to 7-membered ring is formed in cooperation with carbon atoms of the benzene ring.

With respect to the formula R is a hydrogen atom or an optionally substituted hydrocarbon group.

The hydrocarbon group of the optionally substituted hydrocarbon group represented by R is exemplified by the above-mentioned alkyl groups (preferably alkyl groups having 1 to 10 carbon atoms), alkenyl groups (preferably alkenyl groups having 2 to 10 carbon atoms), aryl groups (preferably aryl groups having 6 to 14 carbon atoms) and aralkyl groups (preferably aralkyl groups having 7 to 19 carbon atoms). Useful substituents on the hydrocarbon group include the above-mentioned 5- or 6-membered aromatic heterocyclic groups, halogen atoms, di-C 1 6 alkoxyphosphoryl groups and phosphono groups.

Preferable examples of R are an unsubstituted alkyl groups having 1 to 6 carbon atoms such as methyl, ethyl, WO 96/39134 PCT/JP96/01506 13 propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, pentyl, neopentyl and hexyl.

With respect to the formula B is an optionally esterified or amidated carboxyl group.

The esterified carboxyl group represented by B is exemplified by alkoxycarbonyl group, preferably C-o 10 alkoxy-carbonyl groups methoxycarbonyl, ethoxycarbonyl, propoxycarbonyl, butoxycarbonyl), aryloxy-carbonyl groups, preferably

C

6 14 aryloxy-carbonyl groups phenoxycarbonyl), and aralkyloxycarbonyl groups, preferably

C

7 -1 9 aralkyloxy-carbonyl groups benzyloxycarbonyl).

The amidated carboxyl group represented by B is exemplified by an optionally substituted carbamoyl group represented by the formula: -CON(Rj)(R 2 wherein R 1 and R 2 independently are a hydrogen atom, an optionally substituted hydrocarbon group or an optionally substituted to 7-membered heterocyclic group.

The hydrocarbon group of the optionally substituted hydrocarbon group represented by R 1 or R 2 is exemplified by the above-mentioned alkyl groups, preferably alkyl groups having 1 to 10 carbon atoms methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, pentyl, isopentyl, neopentyl, hexyl, heptyl, octyl, nonyl, decyl), alkenyl groups, preferably those having 2 to 10 carbon atoms allyl, vinyl, 2-penten-l-yl, 3-penten-l-yl, 2hexen-1-yl, 3-hexen-l-yl, 2-cyclohexenyl, 2 -cyclopentenyl, 2-methyl-2-propen-l-yl, 3-methyl-2-buten-l-yl), aryl groups, preferably those having 6 to 14 carbon atoms phenyl, naphthyl, anthryl), and aralkyl groups, preferably those having 7 to 19 carbon atoms benzyl, naphthyl, trityl). These hydrocarbon groups may be substituted by 1 to 3 substituents selected from halogen atoms fluorine, chlorine, bromine, iodine), hydroxyl groups, alkoxy groups having 1 to 6 carbon atoms methoxy, ethoxy, propoxy, butoxy, tert-butoxy, pentyloxy, hexyloxy), amino groups which may be substituted by alkyl groups WO 96/39134 PCT/JP96/01506 14 having 1 to 6 carbon atoms amino, methylamino, ethylamino, dimethylamino, diethylamino, dipropylamino), amino groups substituted by C-o 10 acyl groups acetylamino, propionylamino, benzoylamino), carbamoyl groups which may be substituted by alkyl groups having 1 to 6 carbon atoms carbamoyl, methylcarbamoyl, dimethylcarbamoyl, diethylcarbamoyl),

C

1 -6 alkoxy-carbonyl groups methoxycarbonyl, ethoxycarbonyl, propoxycarbonyl), mono- or di-alkoxyphosphoryl groups (e.g.

mono- or di-C 1 -6 alkoxyphosphoryl groups such as dimethoxyphosphoryl, diethoxyphosphoryl, ethylenedioxyphosphoryl), mono- or di-alkoxyphosphorylalkyl groups mono- or di-Ci-e alkoxyphosphoryl-C 1 -3 alkyl groups such as methoxyphosphorylmethyl, ethoxyphosphorylmethyl, methoxyphosphorylethyl, ethoxyphosphorylethyl, dimethoxyphosphorylmethyl, diethoxyphosphorylmethyl, dimethoxyphosphoryethyl, diethoxyphosphoryethyl), a moiety: 0

-CH

2 -P (CH 2 )p 0 0 wherein p is an integer from 2 to 4, phosphono groups, the above-mentioned aromatic heterocyclic groups, etc..

The 5- to 7-membered heterocyclic group of the optionally substituted 5- to 7-membered heterocyclic group represented by R 1 or R 2 is exemplified by 5- to 7-membered heterocyclic groups containing a sulfur, nitrogen or oxygen atom, 5- or 6-membered heterocyclic groups containing 2 to 4 nitrogen atoms, and 5- or 6-membered heterocyclic groups containing 1 or 2 nitrogen atom(s) and a sulfur or oxygen atom. These heterocyclic groups may be condensed with a 6membered ring containing 2 or fewer nitrogen atoms, a benzene ring or a 5-membered ring containing a sulfur atom.

WO 96/39134 PCT/JP96/01506 15 As substituents of the substituted 5- to 7-membered heterocyclic group represented by R 1 and R 2 there may be used 1 to 4 of the same substituents as those for the substituted hydrocarbon group represented by RI and R 2 above.

Preferable examples of the 5- to 7-membered heterocyclic group represented by R 1 and R 2 include 2-pyridyl, pyrimidyl, pyrazinyl, pyridazinyl, pyrazolyl, imidazolyl, thiazolyl, oxazolyl, pyridoll2,3-dlpyrimidyl, benzopyranyl, l,8-naphthyridyl, quinolyl, thieno[2,3-blpyridyl, tetrazolyl, thiadiazolyl, oxadiazolyl, triazinyl, triazolyl, thienyl, pyrrolyl, pyrrolinyl, furyl, pyrrolidinyl, benzothienyl, indolyl, imidazolidinyl, piperidyl, piperidino, piperazinyl, morpholinyl and morpholino.

The moiety: -NRI(R 2 may form a 5- to 7-membered ring by binding together with RI and R 2 Such rings include morpholine, piperidine, thiomorpholine, homopiperidine, piperidine, pyrrolidine, thiazolidine and azepine.

The substituted alkyl groups as preferable examples of the optionally substituted hydrocarbon group represented by

R

1 and R 2 include trifluoromethyl, trifluoroethyl, difluoromethyl, trichloromethyl, 2-hydroxyethyl, 2-methoxyethyl, 2-ethoxyethyl, 2, 2-dimethoxyethyl, 2, 2-diethoxyethyl, 2-pyridylmethyl, 3-pyridylmethyl, 4-pyridylmethyl, 2-(2-thienyl)ethyl, 3-(3-furyl)propyl, 2-morpholinoethyl, 3-pyrrolylbutyl, 2-piperidinoethyl, 2-(N,N-dimethylamino)ethyl, 2-(N-methyl-N-ethylamino)ethyl, 2-(N,N-diisopropylamino)ethyl, 5-(N,N-dimethylamino)pentyl, N,N-dimethylcarbamoylethyl, N,N-dimethylcarbamoylpentyl, ethoxycarbonylmethyl, isopropoxycarbonylethyl, tert-butoxycarbonylpropyl, 2-diethoxyphosphorylethyl, 3-dipropoxyphosphorylpropyl, 4-dibutoxyphosphorylbutyl, ethylenedioxyphosphorylmethyl, 2-phosphonoethyl and 3-phosphonopropyl. The preferable substituted aralkyl groups include 4chlorobenzyl, 2-f luorophenyl)propyl, 3-methoxybenzyl, 3, 4-dimethoxyphenethyl, 4-ethylbenzyl, 4- (3- WO 96/39134 PCTIJP96IOI 506 16trifluoromethyiphenyl )butyl, 4 -acetylaminobenzyl, 4dimethylaminophenethyl, 4 -diethoxyphosphorylbenzyl and 2- 4 -dipropoxyphosphorylmethylphenyl.) ethyl. The preferable substituted aryl groups include 4 -chlorophenyl, 4cyclohexylphenyl, 5, 6 ,7,8-tetrahydro-2-naphthyl, 3trifluoromethylphenyl, 4-hydroxyphenyl, 3,4,5-trimethoxyphenyl, 6-methoxy-2-naphthyl, 4 -chlorobenzyloxy)phenyl, 3 4 -methylenedioxyphenyl, 4 2 2 2 -trifluoroethoxy)phenyl, 4-propionylphenyl, 4 -cyclohexanecarbonylphenyl, 4-dimethylaminophenyl, 4 -benzoylaminophenyl, 4 -diethoxycarbamoylphenyl, 4 -tert-butoxycarbonylphenyl, 4-diethoxyphosphorylphenyl, 4-diethoxyphosphorylmethylphenyl, 2-diethoxyphosphorylethyl )phenyl, 2 -diethoxyphosphorylmethylphenyl, 3 -diethoxyphosphorylmethylphenyl, 4 -dipropoxyphosphorylphenyl, 4- (2-phosphonoethyl )phenyl, 4 -phosphonomethylphenyl and 4-phosphonophenyl. The preferable substituted 5- to 7membered heterocyclic groups include 5-chloro-2-pyridyl, 3methoxy-2-pyridyl, 5-methyl-2-benzothiazolyl, 5-methyl-4phenyl-2-thiazolyl, 3-phenyl-5-isoxazolyl, 4- (4chlorophenyl )-5-methyl-2-oxazolyl, 3-phenyl-l, 2,4acetylamino-2-pyrimidyl, 3-methyl-2-thienyl, 4, 2-furanyl and 4-methyl-2-morpholinyl.

With respect to the formula ring A is preferably a benzene ring which may be substituted by 1 or more, more preferably 1 or 2 substituents selected from halogen atoms, (Z optionally substituted alkyl groups, (1 optionally substituted hydroxyl groups, T optionally substituted thiol groups and/or (5 optionally substituted 3 0 amino groups.

More preferably, ring A is a benzene ring which may be substituted by 1 or 2 substituents selected from the abovementioned halogen atoms, alkyl groups having 1 to 10 carbon atoms (furthermore preferably 1 to 5 carbon atoms), alkoxy g roups having 1 to 10 carbon atoms (furthermore preferably 1 to 5 carbon atoms), alkylenedioxy groups represented by WO 96/39134 PCT/JP96/01506 17 the formula: -O-(CH2)n-O- wherein n is an integer from 1 to 3, and/or alkylthio groups having 1 to 10 carbon atoms (furthermore preferably 1 to 5 carbon atoms).

Most preferably, ring A is a benzene ring which may be substituted by an alkylenedioxy group represented by the formula: -O-(CH2)n-O- wherein n is. an integer from 1 to 3.

B is preferably an alkoxy-carbonyl group or a group represented by the formula: -CON(RI)(R 2 wherein R 1 and R 2 independently are a hydrogen atom, an optionally substituted hydrocarbon group or an optionally substituted to 7-membered heterocyclic group.

With respect to R 1 and R 2 above, R 1 is preferably a hydrogen atom or an alkyl group having 1 to 10 carbon atoms methyl, ethyl, propyl), and R 2 is preferably a phenyl or phenyl-Ci- 3 alkyl group which may be substituted by a halogen atom fluorine, chlorine, bromine), a Ci-6 alkoxy methoxy, ethoxy), a mono- or dialkoxyphosphoryl (preferablly a mono- or di-Ci-e alkoxyphosphoryl such as diethoxyphosphoryl), a mono- or di-alkoxyphosphorylalkyl (preferablly a mono- or di-C 1 ialkoxyphosphoryl-Cl-3 alkyl such as diethoxyphosphorylmethyl) or a C 1 -6 alkoxycarbonyl methoxycarbonyl, ethoxycarbonyl), or a 5- or 6-membered heterocyclic group pyridyl) which may be substituted by a phenyl and that contains 1 or 2 nitrogen atom(s) or a nitrogen atom and a sulfur atom.

More preferable example of R 1 and R 2 is "R 1 is a hydrogen atom, and R 2 is a phenyl group substituted by a mono- or di-C 1 -6 alkoxyphosphoryl-C1- 3 alkyl 4diethoxyphosphorylmethylphenyl)".

With respect to the formula X is -CH(OH)- or CO-, preferablly -CO-.

With respect to the formula k is 0 or 1, and k' is 0, 1 or 2, preferablly k is 1, and k' is 0.

R is preferably a hydrogen atom, an alkyl group having 1 to 6 carbon atoms methyl, ethyl) or a phenyl group.

WO 96/39134 PCT/JP96/01506 18 The compound is preferably an optically active compound represented by the formula

(II):

,CONH- CH2P OR4 0 0 OR(II) 0 R3 wherein

R

3 is a lower alkyl group; R 4 and R 5 independently are a lower alkyl group or bind together to form a lower alkylene group.

The lower alkyl group represented by R 3

R

4 or Rs in the formula (II) is exemplified by alkyl groups having 1 to 6 (preferably 1 to 4) carbon atoms such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, pentyl, isopentyl, neopentyl and hexyl. R 4 and R 5 may bind together to form a lower alkylene group. In this case,

OR..

a moiety: -p O may represent a moiety: P 0 C H 2 P o o O 0 wherein p is an integer from 2 to 4.

Preferable groups for R 3

R

4 and R 5 include alkyl groups having 1 to 4 carbon atoms such as methyl and ethyl.

The compound (II) is an optically active compound of the (2R,4S) configuration, and contains substantially no compound of the (2S,4R) configuration. The compound (II) of which optical purity is nearly 100% is preferable.

WO 96/39134 PCT/JP96/01506 19 Most preferably, the compound (II) is, for example, (2R,4S)-(-)-N-[4-(diethoxyphosphorylmethyl)phenyl]-1,2,4,5tetrahydro-4-methyl-7,8-methylenedioxy-5-oxo-3-benzothiepine-2-carboxamide (hereinafter also referred to as compound A).

The salt of a non-peptide osteogenetic promoting substance of the present invention is preferably a pharmaceutically acceptable salt. Pharmaceutically acceptable salts include salts with inorganic bases, salts with organic bases and salts with basic or acidic amino acids. Inorganic bases capable for forming such salts include alkali metals sodium, potassium) and alkaline earth metals calcium, magnesium), such organic bases include trimethylamine, triethylamine, pyridine, picoline, N,N-dibenzylethylenediamine and diethanolamine, such inorganic acids include hydrochloric acid, hydrobromic acid, hydroiodic acid, phosphoric acid, nitric acid and sulfuric acid, such organic acids include formic acid, acetic acid, trifluoroacetic acid, oxalic acid, tartaric acid, fumaric acid, maleic acid, methanesulfonic acid, benzenesulfonic acid, ptoluenesulfonic acid and citric acid, and such basic or acidic amino acids include arginine, lysine, aspartic acid and glutamic acid.

The non-peptide osteogenetic promoting substance for the present invention can be produced by, for example, the commonly known method US5071841, US5158943 described above and the method described below or a modification thereof. For example, the compound or a salt thereof can be produced by subjecting a compound represented by the formula (III): WO 96/39134 PCT/JP96/01506 20

B'

(CH2)k-< S(=0)k'

CH-COY

I

R

wherein B' is an esterified carboxyl group; Y is a hydroxy group or a halogen atom; the other symbols are of the same definitions as described above, or a salt thereof to a cyclizing reaction, if necessary, then carrying out an oxidizing reaction and/or a hydrolyzing reaction, or a hydrolyzing reaction and a subsequent amidating reaction, or a hydrolyzing reaction and a subsequent amidating reaction, and then subjecting the reaction product to an oxidizing reaction, followed by a reducing reaction as necessary.

For example, the compound (II) is produced by reacting an optically active compound represented by the formula

(IV):

0c H COOH 0 R3 wherein R 3 is of the same definition as described above, or a reactive derivative at the carboxyl group thereof or a salt thereof, with a compound represented by the formula NH2- -CH 2 P< OR4 O

OR

WO 96/39134 PCT/JP96/01506 21 wherein R 4 and R 5 are of the same definitions as described above, a reactive derivative at the amino group thereof or a salt thereof.

Preferable reactive derivatives of the amino group on the compound include Schiff's base type imino or enamine form tautomeric isomers resulting from reaction of the compound and a carbonyl compound such as an aldehyde acetaldehyde) or a ketone acetone); silyl derivatives resulting from reaction of the compound and a silyl compound such as bis(trimethylsilyl)acetamide, mono(trimethylsilyl)acetamide or bis(trimethylsilyl)urea; and derivatives resulting from reaction of the compound and phosphorus trichloride or phosgene.

Preferable reactive derivatives of the carboxyl group on the compound (IV) include acid halides, acid anhydrides, activated amides and activated esters which are obtained by conventional method. The preferable reactive derivatives include acid chlorides; acid azides; mixed acid anhydrides with a substituted phosphoric acid such as dialkylphosphoric acid, phenylphosphoric acid, diphenylphosphoric acid, dibenzylphosphoric acid or halogenated phosphoric acid, a dialkylphosphorous acid, a sulfurous acid, a thiosulfuric acid, a sulfuric acid, a sulfonic acid such as methanesulfonic acid, an aliphatic carboxylic acid such as acetic acid, propionic acid, butyric acid, isobutyric acid, pivalic acid, pentanoic acid, isopentanoic acid or trichloroacetic acid, or an aromatic carboxylic acid such as benzoic acid; symmetric acid anhydrides; activated amides with imidazole, 4substituted imidazole, dimethylpyrazole, triazole or tetrazole; activated esters such as cyanomethyl ester, methoxymethyl ester, dimethyliminomethyl ester, vinyl ester, propargyl ester, p-nitrophenyl ester, trichlorophenyl ester, pentachlorophenyl ester, mesylphenyl ester, phenylazophenyl ester, phenylthio ester, p-nitrophenyl ester, p- WO 96/39134 PCT/JP96/01506 22 cresylthio ester, carboxymethylthio ester, pyranyl ester, pyridyl ester, piperidyl ester or 8-quinolylthio ester; and esters with N-hydroxy compounds such as N,N-dimethylhydroxylamine, l-hydroxy-2-(lH)-pyridone, N-hydroxysuccinimide, N-hydroxyphthalimide, l-hydroxy-lH-benzotriazole and N-hydroxy-5-norbornene-2,3-dicarboxyimide.

These reactive derivatives can be optionally chosen according to the kind of the compound (IV).

Preferable salts of reactive derivatives of the compound (IV) or include base salts exemplified by alkali metal salts such as sodium salt and potassium salt, alkaline earth metal salts such as calcium salt and magnesium salt, ammonium salt, and organic base salts such as trimethylamine salt, triethylamine salt, pyridine salt, picoline salt, dicyclohexylamine salt and N,N-dibenzylethylenediamine salt.

This reaction is normally carried out in an ordinary solvent such as water, alcohol methanol, ethanol), acetone, dioxane, acetonitrile, chloroform, methylene chloride, ethylene chloride, tetrahydrofuran, ethyl acetate, N,N-dimethylformamide or pyridine, but can be carried out in any other organic solvent, as long as it does not interfere with the reaction. These ordinary solvents may be used in mixture with water. In this reaction, when the compound (IV) or is used in the form of free acid or salt thereof, this reaction is preferably carried out in the presence of an ordinary condensing agent such as N,N'dicyclohexylcarbodiimide; N-cyclohexyl-N'morpholinoethylcarbodiimide; N-cyclohexyl-N'-(4diethylaminocyclohexyl)carbodiimide; N,N'diethylcarbodiimide; N,N'-diisopropylcarbodiimide; N-ethyl- N'-(3-dimethylaminopropyl)carbodiimide; N,N'-carbonylbis(2methylimidazole); pentamethyleneketene-N-cyclohexylimine; diphenylketene-N-cyclohexylimine; ethoxyacetylene; 1-alkoxy-l-chloroethylene; trialkyl phosphite; ethyl polyphosphate; isopropyl polyphosphate; phosphorus oxychloride; WO 96/39134 PCT/JP96/01506 23 diphenylphosphorylazide; thionyl chloride; oxalyl chloride; lower alkyl haloformate such as ethyl chloroformate or isopropyl chloroformate; triphenylphosphine; 2-ethyl-7hydroxybenzisoxazolium salt; xazolium hydroxide intramolecular salt; N-hydroxybenzotriazole; l-(p-chlorobenzenesulfonyloxy)-6-chloro-lHbenzotriazole; or Wilsmeier's reagent as prepared by reacting N,N'-dimethylformamide with thionyl chloride, phosgene, trichloromethyl chloroformate or phosphorus oxychloride. Also desirable is the method using a condensing agent such as N,N'-dicyclohexylcarbodiimide in the presence of N-hydroxybenzotriazole or norbornene-endo-2,3-dicarboxyimide. This reaction may also be carried out in the presence of an inorganic or organic base such as alkali metal hydrogen carbonate tri(lower)alkylamine, pyridine, N-(lower)-alkylmorpholine or N,Ndi(lower)alkylbenzylamine. Although reaction temperature is not subject to limitation, this reaction is normally carried out under cooling to heating conditions (-10 to 120°C). Reaction time is normally about 0.5 to 100 hours, preferably about 1 to 50 hours.

The compound (II) thus obtained may be isolated and purified by known means of separation and purification such as concentration, concentration under reduced pressure, solvent extraction, crystallization, recrystallization, redissolution and chromatography.

The starting compound (IV) can, for example, be produced by optically resolving the racemate of the compound (IV) disclosed in US5158943. Specifically, the optically active compound is produced by preparing a salt of the racemate of the compound (IV) and an optically active base optically active a-methylbenzylamine, brucine, quinine, cinchonine), repeating fractional crystallization based on the solubility difference between the resulting diastereomers to obtain a sparingly soluble salt in pure form, then performing acid treatment. The WO 96/39134 PCT/JP96/01506 24 other optically active compound can be produced by esterifying the racemate of the compound (IV) with an optically active alcohol optically active methyl lactate, methyl mandelate), preparing the other ester in pure form on the basis of the physical property difference between the resulting diastereomers, then performing hydrolysis.

The biodegradable polymer of the present invention is a polymer that is soluble or insoluble in water and degradable in vivo. Examples of such polymers include fatty acid polyesters such as polymers, copolymers and their mixture of one or more kinds of a-hydroxycarboxylic acids lactic acid, glycolic acid, 2-hydroxybutyric acid, 2-hydroxyvaleric acid, 2 -hydroxy-3-methylbutyric acid, 2hydroxycaproic acid, 2 -hydroxyisocaproic acid, 2hydroxycaprylic acid), hydroxydicarboxylic acids malic acid) and hydroxytricarboxylic acids malic acid), lactic acid caprolactones, valerolactones, etc., and derivatives thereof block polymers of polylactic acid, polyglycolic acid and polyethylene glycol), poly-acyanoacrylates, poly-p-hydroxybutyric acid, polyalkylene oxalates polytrimethylene oxalate, polytetramethylene oxalate), polyortho-esters, polyortho-carbonates, polycarbonates polyethylene carbonate, polyethylenepropylene carbonate), polyamino acids poly-y-benzyl- L-glutamic acid, poly-L-alanine, poly-y-methyl-L-glutamic acid), hyarulonates, polystyrene, polymethacrylic acid, acrylic acid-methacrylic acid copolymers, polyamino acids, dakin stearate, ethyl cellulose, acetyl cellulose, nitrocellulose, maleic anhydride copolymers, ethylene-vinyl acetate copolymers, polyvinyl acetate, polyacrylamide, collagen, gelatin, fibrin and hydroxyapatite.

These biodegradable polymers may be in the form of homopolymers or copolymers of two or more kinds, or these 1c mixtures.

WO 96/39134 PCT/JP96/01506 25 Polymerization may be of the random, block or graft type.

Preferable biodegradable polymers include aliphatic polyesters.

From the viewpoint of biodegradability and biocompatibility, polymers and copolymers synthesized from one or more kinds of a-hydroxycarboxylic acids are preferred.

Specifically, copolymers synthesized from one or more kinds of lactic acid, glycolic acid, 2-hydroxybutyric acid, 2hydroxyvaleric acid etc., or mixtures thereof are used.

The biodegradable copolymer for the present invention can be produced by commonly known methods such as that described in EP172636, or a modification thereof.

Although the above-mentioned a-hydroxycarboxylic acids may be of the L- or D,L-configuration, the D,Lconfiguration is preferred.

Homopolymers of the above-mentioned a-hydroxycarboxylic acids include homopolymers of lactic acid, glycolic acid and 2-hydroxybutyric acid. The preferable ahydroxycarboxylic acid is lactic acid. Copolymers of the above-mentioned a-hydroxycarboxylic acids include copolymers of glycolic acid and the other ahydroxycarboxylic acids. Preferable a-hydroxycarboxylic acids are lactic acid and 2 -hydroxybutyric acid.

Specifically, useful copolymers include lactic acid-glycolic acid copolymers and 2-hydroxybutyric acid-glycolic acid copolymers, with preference given to lactic acid-glycolic acid copolymers, etc..

The average molecular weight of these biodegradable polymers for the present invention is preferably chosen from the range of about 2,000 to 800,000, more preferably about 5,000 to 200,000.

The weight-average molecular weight of a lactic acid homopolymer (hereinafter also referred to as polylactic acid) is preferably about 5,000 to 100,000, more preferably about 6,000 to 50,000. A polylactic acid can, for example, WO 96/39134 PCT/JP96/01506 26 be synthesized by commonly known production methods such as that described in EP172636.

The content ratio of lactic acid and glycolic acid in a lactic acid-glycolic acid copolymer is preferably about 100/0 to 50/50 and more preferably about 90/10 to 50/50 The weight-average molecular weight of the lactic acid-glycolic acid copolymer is preferably about 5,000 to 100,000, more preferably about 8,000 to 50,000.

The lactic acid-glycolic acid copolymer can be synthesized by a commonly known production method such as that described in EP172636. The copolymer is preferably synthesized by catalyst-free dehydration polymerization condensation.

With respect to the 2-hydroxybutyric acid-glycolic acid copolymer, the content ratio is preferably such that glycolic acid accounts for about 40 to 70 mol%, and 2hydroxybutyric acid accounts for the remaining portion.

The weight-average molecular weight of the 2-hydroxybutyric acid-glycolic acid copolymer is preferably about 5,000 to 100,000, more preferably about 8,000 to 50,000. The 2hydroxybutyric acid-glycolic acid copolymer can be synthesized by a commonly known production method such as that described in EP172636. The copolymer is preferably synthesized by catalyst-free dehydration polymerization condensation.

The above-described 2-hydroxybutyric acid-glycolic acid copolymer may be used in mixture with polylactic acid.

When the 2-hydroxybutyric acid-glycolic acid copolymer is used in mixture with polylactic acid, the mixing ratio of 2-hydroxybutyric acid/glycolic acid is about 10/90 to 90/10 by weight), preferably about 25/75 to 75/25 by weight).

In the present specification, weight-average molecular weight is defined as that based on polystyrene measured by gel permeation chromatography (GPC). Measurements were taken using a GPC column KF804Lx2 (produced by Showa Denko) WO 96/39134 PCT/JP96/01506 27 and an RI monitor L-3300 (produced by Hitachi Ltd.) with chloroform as a mobile phase.

The amount of biodegradable polymer is variable according to the strength of the pharmacological activity of the non-peptide osteogenetic promoting substance, the speed and duration of drug release from the biodegradable polymer and so on, as long as the desired purpose is accomplished. For example, the biodegradable polymer is used in amounts about 0.2 to 10,000 times (ratio by weight), preferably about 1 to 1,000 times, more preferably about 1 to 100 times, for the amount of the bioactive substance.

The pharmaceutical composition of the present invention can be produced by ordinary methods of producing a pharmaceutical composition, for example, it can be produced by dispersing a non-peptide osteogenetic promoting substance in a biodegradable polymer, or by filling a nonpeptide osteogenetic promoting substance in a previously shaped hollow biodegradable polymer. Specifically, useful methods include the in-water drying method, the phase separation method, the spray drying method, and modifications thereof.

The shape of pharmaceutical composition of the present invention as obtained by a production method mentioned above may be in the form of, for example, fine particles, spheres, rods, needles, pellets, films or creams, but the shape is not limited thereto as long as the desired purpose is accomplished.

In the present specification, a pharmaceutical composition of fine particles is also referred to as a microcapsule or a microsphere.

Example methods of producing microcapsules are described below.

In-water drying method (o/w method) In this method, an organic solvent solution comprising a biodegradable polymer is first prepared. The organic WO 96/39134 PCT/JP96/01506 28 solvent used to produce the pharmaceutical composition of the present invention preferably has a boiling point of not higher than 120 0 C. Such organic solvents include halogenated hydrocarbons dichloromethane, chloroform, chloroethane, dichloroethane, trichloroethane, carbon tetrachloride), aliphatic esters ethyl ester, butyl ester), ethers ethyl ether, isopropyl ether) and aromatic hydrocarbons benzene, toluene, xylene).

These solvents may be used in combination of two or more kinds in appropriate ratios. The organic solvent is preferably dichloromethane or acetonitrile, more preferably dichloromethane. The concentration of biodegradable polymer in the organic solvent solution is normally chosen over the range of about 0.01 to 80% preferably about 0.1 to 70% and more preferably about 1 to 60% although varying depending on molecular weight of biodegradable polymer and organic solvent type, etc..

The non-peptide osteogenetic promoting substance is added and dissolved into the organic solvent solution comprising the biodegradable polymer thus obtained, if necessary after lyophilized or vacuum dried. The amount of non-peptide osteogenetic promoting substance is about 0.001 to 90% preferably about 0.01 to 80% and more preferably about 0.1 to 50% based on the concentration of biodegradable polymer in the organic solvent solution, although varying depending on drug type, mechanism of action on osteogenesis, effect duration, etc..

The organic solvent solution thus prepared is then added to an aqueous phase to form an o/w emulsion using a turbine type mechanical stirrer or the like. The volume of the aqueous phase is normally chosen from the range of about 1 to 10,000 times, preferably about 2 to 5,000 times, and more preferably about 5 to 2,000 times, for the volume of the oil phase.

An emulsifier may be added to the aqueous phase. The emulsifier may be any one as long as it is capable of WO 96/39134 PCT/JP96/01506 29 forming a stable o/w emulsion. Examples of such emulsifiers include anionic surfactants, nonionic surfactants, polyoxyethylene castor oil derivatives, polyvinylpyrrolidone, polyvinyl alcohol, carboxymethyl cellulose, lecithin, gelatin and hyaluronic acid. These may be used in combination as appropriate. The concentration of emulsifier in the aqueous phase is preferably about 0.001 to 20% more preferably about 0.01 to 10% and further more preferably about 0.05 to 5% Solvent evaporation from the oil phase can be achieved by commonly used methods, including the method in which the solvent is evaporated under normal or gradually reduced pressure during stirring using a propeller stirrer or magnetic stirrer, etc., and the method in which the solvent is evaporated while the degree of vacuum is adjusted using a rotary evaporator, etc.. The obtained microcapsules are separated by centrifugal method or filtration, after which they are washed with, for example, water or heptane, several times to remove free non-peptide osteogenetic promoting substances, emulsifier, etc. adhering to the microcapsule surface. The microcapsules are then again dispersed in distilled water, etc. and lyophilized.

In the above-described o/w method, microcapsules may be produced by the s/o/w method, in which a non-peptide osteogenetic promoting substance is dispersed in an organic solvent solution comprising a biodegradable polymer.

In-water drying method (w/o/w method) In this method, a non-peptide osteogenetic promoting substance or a salt thereof is first dissolved or dispersed in water to obtain a concentration specified above to yield an internal aqueous phase, if necessary with dissolving or suspending by adding a drug-retaining substance such as a protein gelatin), seaweed agar), polysaccharide alginic acid), synthetic highmolecular substance polyvinyl alcohol), basic amino acid arginine, lysine) or the like. The internal WO 96/39134 PCT/JP96/01506 30 aqueous phase may be supplemented with an organic acid such as acetic acid, oxalic acid or citric acid, an inorganic acid such as carbonic acid or phosphoric acid, an alkali metal hydroxide such as sodium hydroxide, a basic amino acid such as arginine or lysine or a salt thereof salts with organic acids such as acetic acid, oxalic acid, citric acid or salts with inorganic acids such as carbonic acid, phosphoric acid and hydrochloric acid) as a pH regulator for keeping the stability and solubility of the non-peptide osteogenetic promoting substance or salt thereof. As a stabilizer for the non-peptide osteogenetic promoting substance, there may be added a protein albumin, gelatin), starch derivative dextrin, pullulan etc.), organic acid citric acid), ethylenediaminetetraacetic acid alkali metal salt sodium ethylenediaminetetraacetate), sulfurous acid hydrogen alkali metal salt sodium hydrogen sulfite), synthetic high-molecular substance polyethylene glycol) or the like. Commonly preservatives may also be added p-oxybenzoates methyl paraben, propyl paraben), benzyl alcohol, chlorobutanol and thimerosal.

The additional amount of non-peptide osteogenetic promoting substance is about 0.001 to 90% preferably about 0.01 to 80% and more preferably about 0.1 to although varying depending on drug type, mechanism of action on osteogenesis or effect duration, etc..

The obtained internal aqueous phase is added to a solution (oil phase) containing the biodegradable polymer, followed by emulsifying treatment, to yield a w/o emulsion.

This emulsification is achieved by a known dispersing methods which include the intermittent shaking method, the method using a mixer such as a propeller shaker or a turbine shaker, the colloidal mill method, the homogenizer method and the ultrasonication method. The above-described solution (oil phase) containing the biodegradable polymer is a solution prepared by dissolving the biodegradable WO 96/39134 PCT/JP96/01506 31 polymer in an organic solvent. This solvent may be any solvent as long as its boiling point is not higher than about 120 0 C and it is immiscible with water. Such solvents include halogenated hydrocarbons dichloromethane, chloroform, chloroethane, dichloroethane, trichloroethane, carbon tetrachloride), aliphatic esters ethyl acetate, butyl acetate), ethers ethyl ether, isopropyl ether) and aromatic hydrocarbons benzene, toluene, xylene). These solvents may be used in combination of two or more kinds in appropriate ratios.

The produced w/o emulsion is then added to an aqueous phase to yield a w/o/w emulsion, from which the oil phase solvent is evaporated off, to yield microcapsules. The specific procedure for this production is the same as that described in above.

Phase separation method In this method, a coacervating agent is gradually added to the above-described w/o emulsion under the stirring to precipitate and solidify the biodegradable polymer. The coacervating agent can be used silicon oil, vegetable oils and fats sesame oil, soybean oil, corn oil, cotton seed oil, coconut oil, linseed oil), mineral oils, hydrocarbons n-hexane, n-heptane) as long as it is a polymeric, mineral oil or vegetable oil compound which can be mixed with the solvent of the biodegradable polymer and which does not dissolve the polymer for encapsulation.

These may be used in combination of two or more kinds.

The obtained microcapsules are, after filtration and separation of them, repeatedly washed with heptane, etc. to remove the coacervating agent. The free drug and solvent are then removed by using the same manner as in-water drying method. To prevent particle flocculation during washing, antiflocculants: water-soluble sugars such as mannitol, lactol, glucose and starches corn starch), amino acids such as glycine and alanine, and proteins such as gelatin, fibrin and collagen may be added.

WO 96/39134 PCT/JP96/01506 32 Spray drying method For producing microcapsules by this method, the abovedescribed w/o emulsion is sprayed via a nozzle into the drying chamber of a spray drier to volatilize the organic solvent and water in the fine droplets in a very short time, and microcapsules are obtained. The nozzle is exemplified by the double-fluid nozzle, pressure nozzle and rotary disc nozzle. To prevent microcapsule flocculation, an aqueous solution of the above-described antiflocculant may be sprayed via another nozzle, while the w/o emulsion is sprayed. The microcapsules thus obtained may be warmed under reduced pressure to facilitate the removal of the water and solvent contained them.

In addition to the above-described microcapsules, the pharmaceutical composition of the present invention can be produced by dissolving a biodegradable polymer dispersed a non-peptide osteogenetic promoting substance and forming the solution into spheres, rods, needles, pellets, films or the like, by an appropriate method. The biodegradable polymer dispersed non-peptide osteogenetic promoting substance is produced in accordance with, for example, the method described in US3773919.

In addition, the pharmaceutical composition of the present invention can also be produced by pulverizing to appropriate particle size a biodegradable polymer dispersed the non-peptide osteogenetic promoting substance by a method such as that described in JP62234656, which employs a turbo counter jet mill pulverizer or an ultrasonic jet pulverizer. Specifically, the non-peptide osteogenetic promoting substance is added to an organic solvent containing the biodegradable polymer, and dissolved therein.

The solid solution obtained by vacuum drying is then coarsely pulverized and sieved, followed by solvent removal, after which the coarse particles are pulverized to controlled particle size using an ultrasonic jet pulverizer to yield the pharmaceutical of the present invention.

WO 96/39134 PCT/JP96/01506 33 The pharmaceutical composition of the present invention may be used in the form of microcapsules as such, or formulated into various dosage forms with microcapsules, spheres, rods, needles, pellets, films or creams as starting material. The pharmaceutical composition of the present invention may contain a phosphoric acid or its salt sodium phosphate, potassium phosphate) at the rate of 0 to 30%. The pharmaceutical composition of the present invention can also be administered as a non-oral agent for local administration injectable preparations of intramuscular, subcutaneous, organs or joints, etc., of solid preparations such as, indwellable preparations, granules and powders, liquid preparations such as suspensions, and ointments).

The injectable preparation can be prepared as aqueous suspension by suspending microcapsules in water, along with a dispersing agent surfactants such as Tween 80 and polysaccharides such as carboxymethyl cellulose, sodium alginate and hyarulonic acid, and polysorbate), a preservative methyl paraben, propyl paraben), an isotonizing agent sodium chloride, mannitol, sorbitol, glucose), buffer calcium carbonate), pH adjusting agent sodium phosphate, potassium phosphate), etc., and may be also prepared as an oily suspension by dispersing microcapsules in a vegetable oil such as sesame oil or corn oil with or without a phospholipid such as lecithin, or a moderate-length fatty acid triglyceride MIGLYOL 812).

The phosphate can enhance the osteogenetic promoting activity of the pharmaceutical composition of the present invention.

The concentration of sodium phosphate or potassium phosphate in the injectable preparation is about 0.1 mM to 500 mM, preferably about 1 mM to 100 mM.

The preferable formation of the present invention is as follows.

WO 96/39134 PCT/JP96/01506 34 a lactic acid-glycolic acid copolymer: wherein the ratio of lactic acid/glycolic acid is about 90/10 to 50/50 and the weight-average molecular weight is about 8000 to 50000, 2

R,

4 S)-(-)-N-[4-(diethoxyphosphorylmethyl)phenyl]- 1,2,4,5-tetrahydro-4-methyl-7,8-methylenedioxy-5-oxo-3benzothiepine-2-carboxamide, and sodium phosphate.

The content ratio of based on is about 5 to 30% The content ratio of based on and is about 0.1 to 20% When microcapsules are used as an injectable suspension, for instance, their particle size is chosen over the range from about 0.1 to 300 um of average particle diameter, as long as the requirements concerning the degree of dispersion and needle passage are met. Preferably, the particle size is about 1 to 150 pm, more preferably about 2 to 100 Pm.

The pharmaceutical composition of the present invention is preferably a suspension as described above.

The pharmaceutical composition of the present invention is preferably in the form of fine particles. This is because said pharmaceutical composition is less likely to cause excess pain to the patient when administered through an injection needle for ordinary subcutaneous or intramuscular injection.

The pharmaceutical composition of the present invention is preferably an injectable preparation.

Methods of preparing microcapsules as a sterile preparation include, but are not limited to, the method in which the entire production process is sterile, the method in which gamma rays are used as sterilant, and the method in which an antiseptic is added.

The pharmaceutical composition of the present invention can be used to prevent and treat bone diseases WO 96/39134 PCT/JP96/01506 35 bone fractures, refracture, osteoporosis, osteomalacia, Behcet's syndrome of bone, ankylosing spondylitis, rheumatoid arthritis, and joint tissue destruction caused by deformation gonarthritis and the related diseases), to repair bone tissue after surgery for multiple myeloma, lung cancer, breast cancer, etc., and to regenerate periodontal tissue in periodontopathy, because it shows a sustained release property with the enhanced activity of the nonpeptide osteogenetic promoting substance, and has a sustained-release time for 1 week to 3 months, depending on biodegradable polymer type and content, etc.. The pharmaceutical composition of the present invention is particularly effective in bone fracture patients, because the patients are usually fixed the affected portion and covered with plaster bandage and desire to promote the healing by a single administration rather than by multiple administrations. The sustained-release preparation consisting of the pharmaceutical composition of the present invention can be used in combination of the other active agents. For example, in the case of the compound represented by the formula as osteogenetic promoting substance, as the active agent to be combined with, mention is made of a formulation of calcium compound sodium carbonate), calcitonin, vitamin D alfacalcidol), sex hormone estrogen, estradiol), prostaglandin Al, bisphosphonic acid, ipriflavone, fluoride compound (e.g.

sodium fluoride), vitamin K 2 BMP (bone morphogenetic protein), FGF (fibroblast growth factor), PDGF (platelet derived growth factor), TGF-P (transforming growth factor- IGF-1 (insulin like growth factor-1), IGF-2 (insulin like growth factor-2), PTH (parathyroid hormone), and so on.

With low toxicity, the pharmaceutical composition of the present invention can be safely used in mammals humans, bovines, horses, pigs, dogs, cats, mice, rats, rabbits).

1.

WO 96/39134 PCT/JP96/01506 36 The pharmaceutical composition of the present invention is expected to serve as a safe preparation of high efficacy proving a constant drug effect with low toxicity and meeting the requirements of the prevention and treatment of bone diseases, repair of damaged bone tissue, and regeneration of periodontal tissue in periodontitis etc., because it releases the drug constantly over an extend period of time. For example, when the pharmaceutical composition of the present invention is used to treat bone fractures femoral neck fracture), it can be allowed to efficiently exhibit its osteogenetic promoting action in local and to significantly shorten the healing time, which is conventionally 2 to 6 months following onset of bone fracture. Accordingly, patients shortly return to normal social life, and can be also prevented various complication caused by senile bone fractures.

The dose of the pharmaceutical composition of the present invention may be an effective amount of the nonpeptide osteogenetic promoting substance, although depending on type and content of the non-peptide osteogenetic promoting substance, release time of the drug, and subject animals, etc.. For example, when the pharmaceutical composition of the present invention is used in the form of microcapsules to treat a bone fracture portion, it may be administered at about 0.01 to 500 mg, preferably about 5 to 50 mg, based on the active ingredient content compound per adult (weighing 50 kg) per dosing, once every week to every 3 months.

Brief Description of Drawings Fig. 1 is a graphic representation of fibular bone mineral content (mg) at 2 weeks after administration of microcapsule containing compound A and placebo microcapsule (control) to rats.

Fig. 2 is a graphic representation of temporal change in compound A retention rate at administration site in rats 37 receiving subcutaneous implantation at their backs of a tablet containing microcapsule containing compound A. The abscissa indicates time (weeks) after administration. The ordinance indicates subcutaneous remaining rate of compound A.

Fig. 3 is a graphic representation of temporal change concentration compound A in blood of rats receiving subcutaneous implantation at their backs of a microcapsule containing compound A. The abscissa indicates time (weeks) after administration. The ordinance indicates concentration (pg/ml) of compound A in blood.

Fig. 4 is a graphical representation of the bone Smineral content (BMC), after the injection into the fibula cutting portion, of Compound A-suspension preparation, Sand (II) Compound A-sustained release preparation. The abscissa indicates which preparation was injected. The ordinance indicates the bone mineral content (BMC) gain (mg).

5555* 37a Best Mode for Carrying Out the Invention The present invention is hereinafter described in more detail by means of the following reference examples, working examples and test examples, which examples are not to be construed as limitative. In the working examples and test examples below, room temperature is defined as a temperature between about 0 and 300C.

Examples Reference Example 1 Production of 2 R,4S)-(-)-l,2,4,5-tetrahydro-4-methyl-7,8methylenedioxy-5-oxo-3-benzothiepine-2-carboxylic acid a-methoxycarbonylbenzyl ester A solution of l-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (12.59 g) in dichloromethane (200 ml) was added drop by drop to a solution of tetrahydro-4-methyl-7,8-methylenedioxy-5-oxo-3-benzothiepine-2-carboxylic acid (15.34 g) and methyl mandelic acid (18.19 g) in N,N-dimethylformamide (DMF) (200 i: ml) at 0°C, followed by the addition of 4-dimethylaminopyridine (DMAP) (3.34 After being stirred at 0°C for 1 hour and at room temperature for 15 hours, the mixture was poured over water and extracted with ethyl acetate. The ethyl acetate layer was washed with water and dried *000 0 0 WO 96/39134 PCT/JP96/01506 38 (MgSO 4 after which the solvent was distilled off. The residual crystal was collected by filtration, washed with ether-hexane, and twice recrystallized from ethyl acetatehexane to yield the title compound (4.09 g, yield 17%).

Melting point: 140-141°C Optical rotation [aiD (23 0 -244.2° (c 0.50, CHCl 3 Reference Example 2 Production of 2

R,

4 S)-(-)-l,2,4,5-tetrahydro-4-methyl-7,8methylenedioxy-5-oxo-3-benzothiepine-2-carboxylic acid A mixture of 2

R,

4 S)-(-)-1,2,4,5-tetrahydro-4-methyl- 7,8-methylenedioxy-5-oxo-3-benzothiepine-2-carboxylic acid (R)-a-methoxycarbonylbenzyl ester as obtained in Reference Example 1 (4.18 acetic acid (45 ml) and concentrate hydrochloric acid (30 ml) was stirred for 30 minutes under refluxing conditions. The reaction mixture was poured over water (800 ml). The resulting crystal was collected by filtration, and dissolved in ethyl acetate (150 ml). The ethyl acetate layer was washed with water and dried (MgSO 4 after which the solvent was distilled off. The residual crystal was collected by filtration, washed with hexane, and recrystallized from ethyl acetate-hexane to yield the title compound (1.62 g, yield 59%) in the form of a colorless needle.

Melting point: 194-195 0

C

Optical rotation [aiD (23 0 -210.8° (c 0.50, CH 3

OH)

Reference Example 3 Production of (2R,4S)-(-)-N-[4-(diethoxyphosphorylmethyl)phenyl]-1,2,4,5-tetrahydro-4-methyl-7,8-methylenedioxy-5-oxo-3-benzothiepine-2-carboxamide (compound A) WO 96/39134 PCT/JP96/01506 39 ;CONH-

-CH

2 P

(OC

2

H

5 2 0 CH 3 A solution of l-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (0.39 g) in dichloromethane (7 ml) was added drop by drop to a solution of 1,2,4,5-tetrahydro-4-methyl-7,8-methylenedioxy-5-oxo-3benzothiepine-2-carboxylic acid (0.47 g) as obtained in Reference Example 2 (0.41 g) and diethyl 4-aminobenzylphosphonate (0.41 g) in N,N-dimethylformamide (DMF) (7 ml) at 0°C, followed by the addition of l-hydroxybenzotriazole (HOBt) (0.28 After being stirred at 0°C for 1 hour and at room temperature (25 0 C) for 15 hours, the mixture was poured over water and extracted with ethyl acetate. The ethyl acetate layer was washed with water and dried (MgS0 4 after which the solvent was distilled off. The residual crystal was collected by filtration, and recrystallized from ethyl-hexane acetate and methanolhexane to yield compound A (0.37 g, 44%) in the form of a colorless prism.

Melting point: 181-182°C Optical rotation [a]D (23 0 -187.4° (c 0.50, CHC1 3 Example 1 A dichloromethane solution of a lactic acid-glycolic acid copolymer "hereinafter also referred to as PLGA; lactic acid-glycolic acid content ratio (mol%) and weightaverage molecular weight based on GPC measurement are shown in Table 1; produced by Wako Pure Chemical Industry" and a lactic acid homopolymer (hereinafter also referred to as PLA) was prepared (hereinafter also referred to as solution using a formula shown in Table 1. Similarly, a di- WO 96/39134 PCT/JP96/01506 40 chloromethane solution of compound A was also prepared using a formula shown in Table 1 (hereinafter also referred to as solution Solutions A and B were uniformly mixed together. The mixture was injected to 0.1% aqueous solution of polyvinyl alcohol (EG-40, produced by The Nippon Synthetic Chemical Industry) (hereinafter also referred to as PVA solution) set at 15 0 C in advance in a volume specified in Table 1, and emulsified using a turbine-type homomixer at 7,000 rpm to yield an o/w emulsion, which was then stirred at room temperature for 3 hours to volatilize the dichloromethane. After solidification, the oil phase was centrifuged at 2,000 rpm using a centrifuge (05PR-22, Hitachi Ltd.). The collected microcapsule fraction was again dispersed in distilled water, then centrifuged, followed by washing of released drug, etc.. The collected microcapsules were again dispersed in a small amount of distilled water, then lyophilized. Microcapsules of the particle sizes shown in Table 1 were obtained. The ratio of microcapsules incorporated in compound A was 100%.

Table 1 Solution A Solution B Mir-L/G Weight- Di- PVA Liquid Particle mir-Polymer Dichiorome Volume Sie() capsules Polymer Content average Weight chloro- Compound A thane (ml) (ml) Sie(m Ratio molecular methane Weight (g) (mol%) Weight No. 1 PLGA 75/25 10500 2.4 2.5 0.1 1.0 400 24 No. 2 PLGA 75/25 6500 2.4 1.0 0.1 1.0 400 No. 3 PLGA 75/25 17100 2.4 1.5 0.1 1.0 400 38 No. 4 PLA 100/0 12000 2.4 2.0 0.1 1.0 800 37 No. 5 PLGA 9o/10 20000 2.4 2.0 0.1 1.0 400 No. 6 PLGA 85/15 12100 2.4 2.0 1 0.1 1.0 1 800 51 Lactic acid/Glycolic acid Content Ratio WO 96/39134 PCT/JP96/01506 42 Example 2 About 8 g of a lactic acid-valerolactone copolymer (PLV 2500ML, produced by Taki Chemical, hereinafter also referred to as PLV) or a glycolic acid-caprolactone copolymer (PGC 2500MG, produced by Taki Chemical, hereinafter also referred to as PGC) was placed in a centrifugal tube and heated to about 50 0 C in a water bath. About 80 mg of compound A was mixed in each tube, followed by uniform dispersion, to yield an ointment preparation, which was stored at a cold place.

Example 3 500 mg of microcapsule No. 1 as obtained in Example 1 was uniformly dispersed in two test tubes of fibrinogen solution for Tisseel (produced by Nippon Zoki Pharmaceutical). Two test tubes of thrombin solution for Tisseel were gradually added. Subsequently, each mixture was immediately aspirated into a plastic syringe. The syringe was kept standing at 37 0 C for 30 minutes to solidify the content. After solidification, the content was extruded from the syringe tip and cut using a razor into pellets about 200 u1 in volume.

Example 4 Four milligrams of compound A was filled in the bone defect filler hollow hydroxyapatite (Boneceram P, produced by Sumitomo Pharmaceuticals, 3 mm diameter, 14 mm length, 1 mm pore size). Both ends of the hollow were sealed with clay.

Example To microcapsule No. 3 as obtained in Example 1 which contains compound A (content ratio 20% pulverized gelatin (produced by Nitta Gelatin) was added, to yield a microcapsule-containing tablet preparation 5.5 mm in diameter and 125 mg in weight.

4 1.

WO 96/39134 PCT/JP96/01506 43 Example 6 Microcapsule No. 7 containing compound A (content ratio 10%) was prepared in the same manner as in Example 1, except that PLGA having a lactic acid-glycolic acid content ratio of 85/15 (mol%) and weight-average molecular weight of 14,900 (produced by Wako Pure Chemical Industry). Mean particle size was 31 dm.

Example 7 A dichloromethane solution containing 2.4 g of PLGA (produced by Wako Pure Chemical Industry) whose the lactic acid/glycolic acid content ratio is 85/15 and the weightaverage molecular weight is 14,900 and 0.1 g of the compound A was prepared in the same manner as Example 1.

And 0.2 g of estradiol was added into the solution.

Further PVA solution was put into the solution to obtain O/W emulsion. Microcapsule No. 8 containing the compound A and estradiol was prepared. The mean particle size was 27 )um.

Test Example 1 500 mg of microcapsule No. 1 as obtained in Example 1 was weighed accurately and transferred to a glass centrifugal tube and kept standing at 37 0 C in a powder state. After a given time, the microcapsules were dissolved in a small amount of acetonitrile and quantitatively analyzed by high performance liquid chromatography (hereinafter also referred to as HPLC). The stability tests are shown in Table 2.

The drug content was over 95% even after 4 weeks.

WO 96/39134 PCT/JP96/01506 44 Table 2 Days Remaining 0 99 7 97 14 97 21 28 96 Test Example 2 Microcapsule Nos. 2, 3 and 4 as obtained in Example 1, each 5 mg, were weighed accurately and transferred to a glass vial, followed by shaking in a 37 0 C water bath (TAITEC, incubator M-100, 115 strokes/minute) in the presence of 10 ml of a release test solution (phosphate buffer supplemented with 10% bovine serum albumin, pH To each 100 ul sample taken over time, 100 ul of acetonitrile was added. After shaking, this mixture was centrifuged.

The resulting supernatant was assayed by HPLC to determine the amount of compound A released. The release tests are shown in Table 3.

Three kinds of microcapsules of different release patterns were obtained.

WO 96/39134 PCT/JP96/01506 45 Table 3 Remaining Days No. 2 No. 3 No. 4 0.0 0.0 0.0 0.0 0.3 81.7 8.4 5.7 92.2 18.1 10.5 91.0 27.3 14.8 88.6 36.6 86.4 67.6 33.3 82.9 70.8 11.0 82.8 74.1 Test Example 3 Microcapsule Nos. 3 to 6 as obtained in Example 1, each 25 mg, were dispersed in 0.3 ml of a dispersant (solution of 1.5 mg of carboxymethyl cellulose, 0.3 mg of polysorbate 20 and 15 mg of mannitol in distilled water) and subcutaneously injected to the heads of male SD rats (n 5) at 5 weeks of age under ether anesthesia using a 22G injection needle. Rats were killed at given time intervals 2 after administration. Microcapsules remaining at the administration site were taken out and assayed by HPLC to determine the amount of compound A in the microcapsules.

The results are shown in Table 4.

Various kinds of microcapsules of different release patterns were obtained in vivo as well. Specifically, microcapsule No. 3 was found to have a sustained-release duration of 1 month, microcapsule Nos. 4 and 5 are over 1 month, and microcapsule No. 6 is 3 weeks.

WO 96/39134 PCT/JP96/01506 46 Table 4 Remaining Days No. 3 No. 4 No. 5 No. 6 0 100 100 100 100 1 89 82 62 76 7 47 70 62 47 14 20 48 55 23 21 17 33 44 2 28 2 17 32 6 Test Example 4 An ointment preparation as obtained in Example 2 was filled in an ointment tube. A chip for micropipet attachment was attached to the tube end to facilitate administration to animals. The ointment was subcutaneously administered to the backs of male SD rats (n 5) at weeks of age under ether anesthesia. The amount of administration was based on the tube weight difference between before and after administration. Rats were killed at given time intervals. The amount of residual compound A was determined by HPLC. The results are shown in Table An ointment preparation releasing the entire dose in 1 to 2 weeks was obtained.

WO 96/39134 PCT/JP96/01506 47 Table Remaining Days PGC PLV 0 100 100 1 36 7 9 0 14 1 1 Test Example Under pentobarbital anesthesia, the heads of male SD rats (n 8) at 6 weeks of age were incised, and the periosteum was detached. A hole 4 mm in diameter was then made in the left calvaria using a dental drill. After 1 week following suturing, 25 mg of microcapsule No. 3 as obtained in Example 1 was dispersed in 0.3 ml of a dispersant (solution of 1.5 mg of carboxymethyl cellulose, 0.3 mg of polysorbate 20 and 15 mg of mannitol in distilled water) and subcutaneously administered to the right temple using a 22G injection needle. For control, rats receiving 0.3 ml of the above dispersant alone were used. Three weeks later, the rats were killed. The calvaria was excised and subjected to soft X-ray analysis. Using the photograph obtained, the area of newly formed bone at the bone defect portion was determined by image analysis.

A significant increase in the area of newly formed bone was noted in the microcapsule administration group, 3 demonstrating the excellent osteogenetic promoting activity of the pharmaceutical composition of the present invention.

Test Example 6 Under pentobarbital anesthesia, the left legs of male SD rats (n 8) at 6 weeks of age were incised, and the central portion of the left fibula was exposed then cut uscentral portion of the left fibula was exposed then cut us- WO 96/39134 PCT/JP96/01506 48 ing a cutter. 25 mg of microcapsule No. 1 as obtained in Example 1 was embedded in the fibula cutting portion, followed by suturing. Two weeks later, the rats were killed. The fibula was excised and analyzed using a bone mineral analyzer (DSC-600, Aloca Co., Ltd., Tokyo) to determine the bone mineral content. The bone mineral content in the untreated right fibula was also determined.

The measurement for the right fibula was subtracted from that for the left fibula to obtain the bone mineral content in the callus. For control, compound A-free placebo microcapsules were prepared in the same manner as that used to prepare microcapsule No. 1, and compared with the counterpart in the same manner as in Test Example 5. The results are shown in Figure 1.

Administration of drug-containing microcapsules resulted in significantly increased bone mineral contents, demonstrating the excellent osteogenetic promoting activity of the pharmaceutical composition of the present invention.

Test Example 7 mg of microcapsule No. 1 containing compound A (content ratio as obtained in Example 1 was locally administered to fibular fracture model rats by the method described in Test Example 6. After 2 and 3 weeks, bone mineral content was determined. For control, bone mineral content was determined in a group receiving a placebo microcapsule (drug-free microcapsule) and a spontaneous healing group. The results are shown in Table 6.

WO 96/39134 PCT/JP96/01506 49 Table 6 Bone Mineral Increment (mg) Group 2 Weeks 3 Weeks Untreated group 9.1 1.2 7.7 1.4 Placebo 10.2 1.0 9.8 1.7 microcapsule group Drug-containing Drug-containing 15.2 1.4 15.1 2.2 microcapsule group The drug-containing microcapsule group was found to have a significantly higher bone mineral content, in comparison with the control groups, demonstrating the excellent osteogenetic promoting activity of the pharmaceutical composition of the present invention.

Test Example 8 A microcapsule-containing tablet preparation as obtained in Example 5 was subcutaneously implanted in the backs of male SD rats (n 8) at 5 weeks of age under ether anesthesia. The amount of drug remaining at the administration site was determined by HPLC over time. The results are shown in Figure 2. The subject tablet exhibited a sustained-release property for 6 weeks.

Test Example 9 In accordance with the method of Miyamoto et al.

"Shinpei Miyamoto, Hideki Yoshikawa and Kunio Takaoka: The Bone, 7, 85-96 (1983)", tibiae of rabbits (weighing 3 to 4 kg) were cut to form a bone defect 5 mm in length, which was then filled by inserting a microcapsule-containing tablet preparation as obtained in Example 5, and the wound was fixed externally. For control, a placebo microcapsulecontaining tablet preparation which does not contain compound A was used. Soft X-ray radiography revealed bone WO 96/39134 PCT/JP96/01506 50 adhesion in rabbits administering the tablet containing compound A 2 months after surgery, while no bone adhesion was noted in the rabbits receiving the placebo tablet.

Test Example Microcapsule No. 7 containing compound A (content ratio 10%) as obtained in Example 6 was subcutaneously administered to the backs of male SD rats (n 5) at 5 weeks of age under ether anesthesia, by the method described in Test Example 3 (100 mg/kg rat body weight, based on compound A).

Blood drug concentration was determined by HPLC over time.

The results are shown in Figure 3. A blood drug concentration of 0.05 to 0.1 pg/ml was obtained even at 4 weeks after administration.

Test Example 11 A rat fibular fracture model was prepared by the method described in Test Example 6, to which microcapsule No. 7 containing compound A (content ratio 10%) as obtained in Example 6 was locally administered in the form of a lyophilized powder (1 mg/rat) or a suspension in the dispersant described in Test Example 5 (5 mg/0.25 ml/rat). Two weeks later, bone mineral content was determined by the method described in Test Example 6, and compared with the control placebo microcapsule group. The results are shown in Table 7.

WO 96/39134 PCT/JP96/01506 51 Table 7 Bone Mineral Increment (mg) Group Lyophilized Powder Suspension Powder Placebo 8.3 0.7 7.6 0.9 microcapsule group Drug-containing Drug-containing 12.2 0.8 10.2 0.8 microcapsule group Whether the drug form was lyophilized powder or suspension, the drug-containing microcapsule group was found to have a significantly higher bone mineral content, in comparison with the control groups, demonstrating the excellent osteogenetic promoting activity of the pharmaceutical composition of the present invention.

Test Example 12 A rat fibular fracture model was prepared by the method described in Test Example 6. And microcapsule No. 7 was suspended into a dispersion medium containing various concentration of sodium phosphate which is prepared by adjusting a solution of D-sorbitol (2.5 sodium chloride (0.9 polysorbate (0.1 g) and carboxymethyl cellulose (0.5 g) in distilled water.

The suspension was locally administered (5 mg/0.25 ml/rat). Two weeks later, bone mineral content was determined by the same method described in Test Example 6.

The results are shown in Table 8.

WO 96/39134 PCT/JP96/01506 52 Table 8 Sodium phosphate Bone Mineral In- Content (mM) crement (mg) 0 7.0 0.6 2 9.2 1.4 9.6 100 12.0 1.6 Effect of the invention Showing enhanced osteogenetic promoting activity with low toxicity over a long period of time, the pharmaceutical composition of the present invention can be safely used as a prophylactic/therapeutic agent for various bone diseases in mammals, bone fractures, osteoporosis, osteomalacia, Behcet's syndrome of bone, ankylosing spondylitis, rheumatoid arthritis, gonarthritis deformans, and joint tissue destruction caused by the related diseases, as a bone tissue repairing agent after surgery for multiple myeloma, lung cancer, breast cancer, etc., and as a periodontal tissue regeneration promoter in periodontopathy, etc..

Industrial Applicability The pharmaceutical composition comprising a nonpeptide osteogenetic substance and a biodegradable polymer is a useful agent for treating and/or preventing bone diseases.

52a Exp erimn nt (1)Materials: (i)Compound A: (2R,4S)-(-)-N-[4-(diethoxyphosphorylmethyl)phenyl]-1,2,4,5-tetrahydro-4methyl- 7 ,8-methylenedioxy-5-oxo-3-benzothiepine-2-carboxamide (ii)Compound A-sustained release preparation: A suspension, which comprises 25 mg of Microcapsule No.l as obtained in Example 1 described in the specification of the present application including 1mg of Compound A, and 0.lml of dispersing agents, i.e. 5% mannitol, 0.5% carboxymethylcellulose sodium and 0.2% Tween 80(trade name).

(iii)Compound A-suspension: A suspension which comprises 1mg of Compound A and 0.lml of .'dispersing agents, i.e. 5% mannitol, 0.5% carboxymethylcellulose *:,.sodium and 0.2% Tween 80(trade name).

(2)Test Methods: Under pentobarbital anesthesia, the left legs of male SD rats at :::weeks of age were incised, and the central portion of the left fibula was exposed, and then cut using a cutter. 0.1 ml of the Compound A-sustained release .*preparation or compound A-suspension of the above materials was injected to the fibula cutting portion, followed by suturing. Three weeks later, fibula of the rat was excised and analyzed to determine the bone mineral content using a bone mineral analyzer (DSC-600, Aloca Co., Ltd., Japan).

"(3)Results: Results obtained are shown in Fig.4 (4)Conclusion: The administration of Compound A-sustained release preparation of the :present invention results in significantly increased bone mineral contents than 'the administration of Compound A-suspension.

The increment of the bone mineral content represents the formation of callus, which is essential for the healing of bone fractures. In this context, the callus-formation activities of Compound A-sustained release formulation can accelerate the healing of bone diseases such as bone fractures and bone defects.

Furthermore, the sustained release of Compound A plays a pivotal role for the bone formation.

-52b- This demonstrates the excellent osteogenetic promoting activity of the pharmaceutical composition of the present invention.

In the claims which follow and in the preceding description of the invention, except where the context requires otherwise due to express language or necessary implication, the words "comprises" and "comprising" are used in the sense of "includes" and "including", i.e. the features specified may be associated with further features in various embodiments of the invention.

O

000 S *oo see* *0 O 00 0 9 0 0 0 0* 00 00 0 0 r 9 0

Claims (34)

1. A pharmaceutical composition which is a sustained release composition comprising a non-peptide osteogenetic promoting substance and a biodegradable polymer.

2. A pharmaceutical composition according to claim 1, which further comprises a phosphoric acid or its salt.

3. A pharmaceutical composition according to claim 1, wherein the non-peptide osteogenetic promoting substance is non-steroid.

4. A pharmaceutical composition according to claim 1, which is used for local administration.

5. A pharmaceutical composition according to claim 1, see which is used for promotion of bone fracture healing. e*

6 A pharmaceutical composition according to claim 1, wherein the non-peptide osteogenetic promoting substance is a compound represented by the formula: B (CH2)k Al (I) R *see wherein ring A is an optionally substituted benzene ring R is a hydrogen atom or an optionally substituted hydrocarbon group; B is an optionally esterified or amidated carboxyl group; X is -CH(OH)- or k is 0 or 1; and k' is 0, 1 or 2, or its salt.

7 A pharmaceutical composition according to claim 6 wherein the ring A is a benzene ring which may be substituted by 1 or 2 substituents selected from the group 54 consisting of a halogen, C 1 -1 0 alkyl, C 1 10 alkoxy, -0- (CH 2 wherein n is 1 to 3 and C-1io alkylthio.

8. A pharmaceutical composition according to claim 6, wherein B is -CON(R 1 )(R 2 wherein R 1 and R 2 are independently a hydrogen atom, an optionally substituted hydrocarbon group or an optionally substituted 5 to 7 membered heterocyclic group.

9. A pharmaceutical composition according to claim 8, wherein R 1 is hydrogen atom or a C1- 10 alkyl group, and R 2 is a phenyl or phenyl-C1- 3 alkyl group which may be substituted by a halogen, C 1 -6 alkoxy, mono- or di-Cl-6 alkoxyphosphoryl, mono- or di-C 1 -6 alkoxyphosphoryClC 1 _3 S. alkyl, -CH 2 P (CH 2 )p wherein p is 2 to 4 or C1-6 II .0 0 alkoxycarbonyl or (ii) a 5- or 6-membered heterocyclic *500 1 group containing 1 or 2 nitrogen atom(s) or 1 nitrogen atom and 1 sulfur atom, which may be substituted by a phenyl.

10. A pharmaceutical composition according to claim 6, wherein R is a hydrogen atom, Ci-6 alkyl group or phenyl group.

11. A pharmaceutical composition according to claim 6, wherein k is 1 and k' is 0.

12. A pharmaceutical composition according to claim 1, V wherein the non-peptide osteogenetic promoting substance is an optically active compound represented by the formula: /OR 4 \CONH CH 2 P O O5 (I I 0 OR 0 R3 wherein R 3 is a lower alkyl group; and R 4 and R 5 are independently a lower alkyl group or bind together to form a lower alkylene group. 55

13. A pharmaceutical composition according to claim 12, wherein R 3 R 4 and R 5 are independently a CI- 6 alkyl group.

14. A pharmaceutical composition according to claim 1, wherein the compound is (2R, (diethoxyphosphorylmethyl)phenyl]-1,2,4,5-tetrahydro-4- methyl-7,8-methylenedioxy-5-oxo-3-benzothiepine-2- carboxamide.

A pharmaceutical composition according to claim 1, wherein the ratio by weight of the biodegradable polymer based on the non-peptide osteogenetic promoting substance is about 1 to 100 times.

16. A pharmaceutical composition according to claim 1, which comprises (diethoxyphosphorylmethyl)phenyl]-1,2,4, 0 methyl-7,8-methylenedioxy-5-oxo-3-benzothiepine-2- carboxamide and a biodegradable polymer.

S•17. A pharmaceutical composition according to claim 16, which further comprises a phosphoric acid or its salt.

18. A pharmaceutical composition according to claim 17, wherein the phosphoric acid or its salt is sodium phosphate. &sea

19. A pharmaceutical composition according to claim 16, wherein the content ratio of diethoxyphosphorylmethyl)phenyl]-1,2,4,5-tetrahydro-4- methyl-7,8-methylenedioxy-5-oxo-3-benzothiepine-2 carboxamide based on the biodegradable polymer is about to 30% and the content ratio of sodium phosphate based on (2R,4S)-(-)-[N-(diethoxyphosphorylmethyl)phenyl]- 1,2,4,5-tetrahydro-4-methyl-7,8-methylenedioxy-5-oxo-3- benzothiepine-2-carboxamide and the biodegradable polymer is about 0.1 to

20% A pharmaceutical composition according to claim 16, wherein the biodegradable polymer is a lactic acid- glycolic acid copolymer. 56

21. A pharmaceutical composition according to claim wherein the ratio of lactic aicd/glycolic acid is about 90/10 to 50/50 and the weight-average molecular weight is about 8000 to 50000.

22. A pharmaceutical composition according to claim 1, wherein the biodegradable polymer is an aliphatic polyester.

23. A pharmaceutical composition according to claim 22 wherein the aliphatic polyester is a lactic acid- glycolic acid copolymer.

24. A pharmaceutical composition according to claim 1, wherein is in the form of a suspension.

A pharmaceutical composition according to claim 1, i: which is used for injection.

26. Use of a pharmaceutical composition according to claim 1 for manufacturing an agent for treating or preventing bone diseases. os**

27. Use of a biodegradable polymer to enhance osteogenetic promoting activity of a non-peptide osteogenetic promoting substance.

28. Method for treating or preventing bone diseases in mammals which comprises administering to a subject in need an effective amount of a pharmaceutical composition according to claim 1. s

29. Method according to claim 28, wherein the bone diseases are bone fractures.

30. An agent for treating or preventing bone diseases with enhanced osteogenetic promoting activity, which comprises a non-peptide osteogenetic promoting substance and a biodegradable polymer. -57-

31. Use of an effective amount of a pharmaceutical composition according to claim 1 for treating or preventing bone diseases.

32. Use according to claim 31 wherein the bone diseases are bone fractures.

33. A pharmaceutical composition according to claim 1 when used in treating or preventing bone diseases.

34. A pharmaceutical composition according to claim 1 when used in treating or preventing bone diseases, wherein the bone diseases are bone fractures. A pharmaceutical composition comprising a non- peptide osteogenetic promoting substance and a **biodegradable polymer sustantially as herein described with reference to any one of Examples 1 to 7. Dated this 18 th day of January 2000 TAKEDA CHEMICAL INDUSTRIES, LTD. By their Patent Attorneys GRIFFITH HACK