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【结 构 式】

【分子编号】11948

【品名】ethyl 5-chloro-3-phenyl-7,8-dihydrofuro[2,3-g][1,2]benzisoxazole-7-carboxylate

【CA登记号】

【 分 子 式 】C18H14ClNO4

【 分 子 量 】343.7662

【元素组成】C 62.89% H 4.1% Cl 10.31% N 4.07% O 18.62%

与该中间体有关的原料药合成路线共 2 条

合成路线1

该中间体在本合成路线中的序号:(XII)

3) The chlorination of 1,3-dimethoxybenzene (V) with SO2Cl2 in CHCl3 gives 1-chloro-2,4-dimethoxybenzene (VI), which is condensed with (II) by means of AlCl3 in dichloroethane yielding 5-chloro-2-hydroxy-4-methoxybenzophenone (VII). The cyclocondensation of (VII) with hydroxylamine - HCl and then with acetic anhydride - sodium acetate in refluxing DMF affords 5-chloro-6-methoxy-3-phenyl-1,2-benzoisoxazole (VIII), which is demethylated with pyridine hydrochloride at 180 C, giving 5-chloro-6-hydroxy-3-phenyl-1,2-benzoisoxazole (IX). The condensation of (IX) with dimethylamine and formaldehyde in water gives 5-chloro-7-(dimethylaminomethyl)-6-hydroxy-3-phenyl-1,2-benzoisoxazole (X), which is cyclized with (ethoxycarbonylmethyl)dimethylsulfonium bromide (XI) by means of K2CO3 in DMF, yielding 5-chloro-3-phenyl-7,8-dihydrofuro[2,3-g]-1,2-benzoisoxazole-7-carboxyli c acid ethyl ester (XII). Finally, this compound is hydrolyzed with NaOH in refluxing ethanol. 4) The condensation of isoxazole (IX) with allyl bromide by means of K2CO3 in DMF gives 6-allyloxy-5-chloro-3-phenyl-1,2-benzoisoxazole (XIII), which is rearranged with refluxing N,N-dimethylaniline yielding 7-allyl-5-chloro-6-hydroxy-3-phenyl-1,2-benzisoxazole (XIV). The cyclization of (XIV) with m-chloroperbenzoic acid (MCPBA) in refluxing CHCl3 or N-bromosuccinimide in DMSO affords 5-chloro-3-phenyl-7,8-dihydrofuro[2,3-g]-1,2-benzisoxazole-7-methanol (XV), which is finally oxidized with CrO3-H2SO4 in acetone or KMnO4 in dichloroethane. 5) The alkylation of phenol (IX) with ortho-acrylic acid trietyl ester (XXI) by means of pivalic acid in refluxing toluene gives the substituted chromane (XXIII), which is then treated with Br2 in pyridine-CHCl3 to afford ethyl ester (XII), already obtained.

1 Sato, H.; Koga, H.; Dan, T.; Onuma, E. (Chugai Pharmaceutical Co. Ltd.); Furobenzisoxazole derivs. EP 0205872; US 4791209 .
2 Koga, H.; Sato, H. (Chugai Pharmaceutical Co. Ltd.); Industrial process for the preparation of furobenzisoxazole derivs. JP 1989143875 .
3 Koga, H.; Sato, H. (Chugai Pharmaceutical Co. Ltd.); Method for the synthesis of furobenzisoxazole derivs. JP 1989143876 .
4 Koga, H.; Sato, H. (Chugai Pharmaceutical Co. Ltd.); Method for the preparation of furobenzisoxazole derivs. JP 1989131180 .
5 Prous, J.; Castaner, J.; AA-193. Drugs Fut 1991, 16, 11, 985.
6 Onuma, E.; Dan, T.; Koga, H.; Sato, H.; Aoki, B.; Tanaka, H.; Studies on uricosuric diuretics. II. Substituted 7,8-dihydrofuro[2,3-g]-1,2-benzisoxazole-7-carboxylic acids and 7,8-dihydrofuro[2,3-g]benzoxazole-7-carboxylic acids. Chem Pharm Bull 1991, 39, 7, 1760-72.
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
(II) 10463 Benzoyl chloride 98-88-4 C7H5ClO 详情 详情
(V) 11934 m-Dimethoxybenzene; 1,3-Dimethoxybenzene; 3-Methoxyphenyl methyl ether 151-10-0 C8H10O2 详情 详情
(VI) 11942 1-Chloro-2,4-dimethoxybenzene; 2-Chloro-5-methoxyphenyl methyl ether 7051-13-0 C8H9ClO2 详情 详情
(VII) 11943 (5-Chloro-2-hydroxy-4-methoxyphenyl)(phenyl)methanone C14H11ClO3 详情 详情
(VIII) 11944 5-Chloro-3-phenyl-1,2-benzisoxazol-6-yl methyl ether; 5-Chloro-6-methoxy-3-phenyl-1,2-benzisoxazole C14H10ClNO2 详情 详情
(IX) 11945 5-Chloro-3-phenyl-1,2-benzisoxazol-6-ol C13H8ClNO2 详情 详情
(X) 11946 5-Chloro-7-[(dimethylamino)methyl]-3-phenyl-1,2-benzisoxazol-6-ol C16H15ClN2O2 详情 详情
(XI) 11947 (2-Ethoxy-2-oxoethyl)(dimethyl)sulfonium bromide 5187-82-6 C6H13BrO2S 详情 详情
(XII) 11948 ethyl 5-chloro-3-phenyl-7,8-dihydrofuro[2,3-g][1,2]benzisoxazole-7-carboxylate C18H14ClNO4 详情 详情
(XIII) 11949 Allyl 5-chloro-3-phenyl-1,2-benzisoxazol-6-yl ether; 6-(Allyloxy)-5-chloro-3-phenyl-1,2-benzisoxazole C16H12ClNO2 详情 详情
(XIV) 11950 7-Allyl-5-chloro-3-phenyl-1,2-benzisoxazol-6-ol C16H12ClNO2 详情 详情
(XV) 11941 (5-Chloro-3-phenyl-7,8-dihydrofuro[2,3-g][1,2]benzisoxazol-7-yl)methanol C16H12ClNO3 详情 详情
(XXII) 11951 3,3,3-Triethoxy-1-propene; 1,1-Diethoxy-2-propenyl ethyl ether C9H18O3 详情 详情
(XXIII) 11952 5-Chloro-7-ethoxy-3-phenyl-8,9-dihydro-7H-chromeno[6,5-d]isoxazol-7-yl ethyl ether; 5-Chloro-7,7-diethoxy-3-phenyl-8,9-dihydro-7H-chromeno[6,5-d]isoxazole C20H20ClNO4 详情 详情

合成路线2

该中间体在本合成路线中的序号:(XV)

Several related syntheses for AA-193 have been reported: 1) The Friedel-Crafts' condensation of 2,5-dichlorophenol (I) with benzoyl chloride (II) by means of AlCl3 gives 2,5-dichloro-4-hydroxybenzophenone (III), which by reaction with hydroxylamine and KOH is converted to 5-chloro-6-hydroxy-3-phenylbenzisoxazole (IV). The condensation of (IV) with allyl bromide (V) by means of K2CO3 affords the 7-allyl derivative (VI), which is cyclized by means of N-bromosuccinimide and NaOH to 5-chloro-7-(hydroxymethyl)-3-phenyl-7,8-dihydrofuro[2,3-g]-1,2-benzisox azole (VII). Finally, this compound is oxidized to the final product with KMnO4 in refluxing dichloromethane. 2) The chlorination of 1,3-dimethoxybenzene (VIII) with SO2Cl2 gives 1-chloro-2,4-dimethoxybenzene (IX), which is condensed with benzoyl chloride (II) as before, yielding 5-chloro-2,4-dihydroxybenzophenone (X). Tosylation of (X) with tosyl chloride gives the corresponding ditosyl derivative (XI), which by reaction with hydroxylamine is converted to the oxime (XII). Finally, this compound is treated with KOH in order to cyclize to the benzisoxazole (IV). 3) The reaction of the benzisoxazole (IV) with formaldehyde and dimethylamine gives 5-chloro-7-(dimethylaminomethyl)-6-hydroxy-3-phenylbenzisoxazole (XIII), which is condensed and cyclized with the ylide (XIV) to yield the ethyl ester of the desired product (XV). Finally, this compound is hydrolyzed with NaOH.

1 Koga, H.; Kuromaru, K.; Ishizawa, T.; Aoki, B.; Sato, H.; Studies on uricosuric diuretics. V. Convenient and efficient synthesis of 2,3-dihydrobenzofuran derivatives. Chem Pharm Bull 1992, 40, 10, 2597.
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
(I) 11953 2,5-Dichlorophenol 583-78-8 C6H4Cl2O 详情 详情
(II) 10463 Benzoyl chloride 98-88-4 C7H5ClO 详情 详情
(III) 11955 (2,5-Dichloro-4-hydroxyphenyl)(phenyl)methanone C13H8Cl2O2 详情 详情
(IV) 11945 5-Chloro-3-phenyl-1,2-benzisoxazol-6-ol C13H8ClNO2 详情 详情
(V) 11463 3-Bromo-1-propene; 3-Bromopropene;allyl bromide 106-95-6 C3H5Br 详情 详情
(VI) 11950 7-Allyl-5-chloro-3-phenyl-1,2-benzisoxazol-6-ol C16H12ClNO2 详情 详情
(VII) 11941 (5-Chloro-3-phenyl-7,8-dihydrofuro[2,3-g][1,2]benzisoxazol-7-yl)methanol C16H12ClNO3 详情 详情
(VIII) 11934 m-Dimethoxybenzene; 1,3-Dimethoxybenzene; 3-Methoxyphenyl methyl ether 151-10-0 C8H10O2 详情 详情
(IX) 11942 1-Chloro-2,4-dimethoxybenzene; 2-Chloro-5-methoxyphenyl methyl ether 7051-13-0 C8H9ClO2 详情 详情
(X) 11962 (5-Chloro-2,4-dihydroxyphenyl)(phenyl)methanone C13H9ClO3 详情 详情
(XI) 11963 2-benzoyl-4-chloro-5-[[(4-methylphenyl)sulfonyl]oxy]phenyl 4-methylbenzenesulfonate C27H21ClO7S2 详情 详情
(XII) 11964 4-chloro-2-[(hydroxyimino)(phenyl)methyl]-5-[[(4-methylphenyl)sulfonyl]oxy]phenyl 4-methylbenzenesulfonate C27H22ClNO7S2 详情 详情
(XIII) 11946 5-Chloro-7-[(dimethylamino)methyl]-3-phenyl-1,2-benzisoxazol-6-ol C16H15ClN2O2 详情 详情
(XIV) 11966 2-(Dimethylsulfonium)acetic acid ethyl ester inner salt C6H12O2S 详情 详情
(XV) 11948 ethyl 5-chloro-3-phenyl-7,8-dihydrofuro[2,3-g][1,2]benzisoxazole-7-carboxylate C18H14ClNO4 详情 详情
Extended Information