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〖来源〗J Antibiot 〖合成路线〗 〖标题〗Synthesis and oral activity of ME1207, a new orally active cephalosporin 〖合成方法〗The reaction of 3-(chloromethyl)-7-(phenylacetamido)-3-cephem-4-carboxylic acid 4-methoxybenzyl ester (I) with triphenylphosphine and NaI in acetone gives the corresponding phosphonium salt (II), which is condensed with 4-methylthiazole-5-carboxaldehyde (III) by means of NaHCO3 in dichloromethane affording 3-[2(Z)-(4-methylthiazol-5-yl)vinyl]-7-(phenylacetamido)-3-cephem-4-carboxylic acid 4-methoxybenzyl ester (IV). The cleavage of the amido group of (IV) with PCl5 and pyridine yields the 7-amino compound (V), which is condensed with 2-(methoxyimino)-2-[2-(tritylamino)thiazol-4-yl]acetic acid (VI) by means of POCl3 in dichloromethane giving 3-[2(Z)-(4-methylthiazol-5-yl)vinyl]-7-[2(Z)-methoxyimino)-2-(2-tritylamino)thiazol-4-yl)acetamido]-3-cephem-4-carboxylic acid 4-methoxybenzyl ester (VII). The deprotection of (VII) with trifluoroacetic acid and anisole yields the free amino acid (VIII), which is finally esterified with iodomethyl pivalate (IX) in DMF. 〖作者〗Sakagami, K.; Tamura, A.; Yoshida, T.; Nishihata, K.; Fukatsu, S.; Atsumi, K. 〖参考〗Sakagami, K.; Tamura, A.; Yoshida, T.; Nishihata, K.; Fukatsu, S.; Atsumi, K.; Synthesis and oral activity of ME1207, a new orally active cephalosporin. J Antibiot 1990, 43, 8, 1047 〖出处〗J Antibiot1990,43,(8):1047 〖来源〗Drugs Fut 〖合成路线〗 〖标题〗Cefditoren Pivoxil 〖合成方法〗The reaction of 3-(chloromethyl)-7-(phenylacetamido)-3-cephem-4-carboxylic acid 4-methoxybenzyl ester (I) with triphenylphosphine and NaI in acetone gives the corresponding phosphonium salt (II), which is condensed with 4-methylthiazole-5-carboxaldehyde (III) by means of NaHCO3 in dichloromethane affording 3-[2(Z)-(4-methylthiazol-5-yl)vinyl]-7-(phenylacetamido)-3-cephem-4-carboxylic acid 4-methoxybenzyl ester (IV). The cleavage of the amido group of (IV) with PCl5 and pyridine yields the 7-amino compound (V), which is condensed with 2-(methoxyimino)-2-[2-(tritylamino)thiazol-4-yl]acetic acid (VI) by means of POCl3 in dichloromethane giving 3-[2(Z)-(4-methylthiazol-5-yl)vinyl]-7-[2(Z)-methoxyimino)-2-(2-tritylamino)thiazol-4-yl)acetamido]-3-cephem-4-carboxylic acid 4-methoxybenzyl ester (VII). The deprotection of (VII) with trifluoroacetic acid and anisole yields the free amino acid (VIII), which is finally esterified with iodomethyl pivalate (IX) in DMF. 〖作者〗Casta馿r, J.; Prous, J. 〖参考〗Casta馿r, J.; Prous, J.; Cefditoren Pivoxil. Drugs Fut 1992, 17, 8, 665 〖出处〗Drugs Fut1992,17,(8):665 〖备注〗Synthesis The reaction of 3-(chloromethyl)-7-(phenylacetamido)-3-cephem-4-carboxylic acid 4-methoxybenzyl ester (I) with triphenylphosphine and NaI in acetone gives the corresponding phosphonium salt (II), which is condensed with 4-methylthiazole-5-carboxaldehyde (III) by means of NaHCO3 in dichloromethane affording 3-[2(Z)-(4-methylthiazol- -5-yl)vinyl]-7-(phenylacetamido)-3-cephem-4-carboxylic acid 4-methoxybenzyl ester (IV). The cleavage of the amido group of (IV) with PCl5 and pyridine yields the 7-amino compound (V), which is condensed with 2-(methoxyimino)-2-[2-(tritylamino)thiazol-4-yl]acetic acid (VI) by means of POCl3 in dichloromethane giving 3-[2(Z)-(4-methylthiazol-5-yl)vinyl]-7-[2(Z)-methoxyimino)-2- (2-tritylamino)thiazol-4-yl)acetamido]-3-cephem-4-carboxylic acid 4-methoxybenzyl ester (VII). The deprotection of (VII) with trifluoroacetic acid and anisole yields the free amino acid (VIII), which is finally esterified with iodomethyl pivalate (IX) in DMF (1-3). Scheme 1. Description Yellow powder, m.p. 127-9? alpha(20,D) -48.5?(c 0.5, MeOH). Manufacturer Meiji Seika Kaisha, Ltd. (Japan). References 1. Atumi, K., Sakagami, K., Yamamoto, Y., Yoshida, T., Nishihata, K., Kondo, S., Fukatsu, S. (Meiji Seika Kaisha, Ltd.). New cephalosporin cpds. and the production thereof. EP 175610, ES 8704955, JP 86178991, JP 87019593. 2. Sakagami, K., Atsumi, K., Tamura, A., Yoshida, T., Nishihata, K., Fukatsu, S. Synthesis and oral activity of ME1207, a new orally active cephalosporin. J Antibiot 1990, 43(8): 1047. 3. Sakagami, K., Atsumi, K., Yamamoto, Y., Tamura, A., Yoshida, T., Nishihata, K., Fukatsu, S. Synthesis and oral activity of pivaloyloxymethyl 7-[(Z)-2-(2-aminothiazol-4-yl)-2-methoxyiminoacetamido]-3(Z)- -(4-methylthiazol-5-yl)vinyl-3-cephem-4-carboxylate (ME1207) and its related compound. Chem Pharm Bull 1992, 39(9): 2433. 〖来源〗Chem Pharm Bull 〖合成路线〗 〖标题〗Synthesis and oral activity of pivaloyloxymethyl 7-[(Z)-2-(2-aminothiazol-4-yl)-2-methoxyiminoacetamido]-3(Z)--(4-methylthiazol-5-yl)vinyl-3-cephem-4-carboxylate (ME1207) and its related compound 〖合成方法〗The reaction of 3-(chloromethyl)-7-(phenylacetamido)-3-cephem-4-carboxylic acid 4-methoxybenzyl ester (I) with triphenylphosphine and NaI in acetone gives the corresponding phosphonium salt (II), which is condensed with 4-methylthiazole-5-carboxaldehyde (III) by means of NaHCO3 in dichloromethane affording 3-[2(Z)-(4-methylthiazol-5-yl)vinyl]-7-(phenylacetamido)-3-cephem-4-carboxylic acid 4-methoxybenzyl ester (IV). The cleavage of the amido group of (IV) with PCl5 and pyridine yields the 7-amino compound (V), which is condensed with 2-(methoxyimino)-2-[2-(tritylamino)thiazol-4-yl]acetic acid (VI) by means of POCl3 in dichloromethane giving 3-[2(Z)-(4-methylthiazol-5-yl)vinyl]-7-[2(Z)-methoxyimino)-2-(2-tritylamino)thiazol-4-yl)acetamido]-3-cephem-4-carboxylic acid 4-methoxybenzyl ester (VII). The deprotection of (VII) with trifluoroacetic acid and anisole yields the free amino acid (VIII), which is finally esterified with iodomethyl pivalate (IX) in DMF. 〖作者〗Yamamoto, Y.; Yoshida, T.; Tamura, A.; Atsumi, K.; Fukatsu, S.; Sakagami, K.; Nishihata, K. 〖参考〗Yamamoto, Y.; Yoshida, T.; Tamura, A.; Atsumi, K.; Fukatsu, S.; Sakagami, K.; Nishihata, K.; Synthesis and oral activity of pivaloyloxymethyl 7-[(Z)-2-(2-aminothiazol-4-yl)-2-methoxyiminoacetamido]-3(Z)--(4-methylthiazol-5-yl)vinyl-3-cephem-4-carboxylate \IăȈú耀û耀 〖出处〗Chem Pharm Bull1992,39,(9):2433 〖来源〗EP 0175610; ES 8704955; JP 1986178991; JP 1987019593 〖合成路线〗 〖标题〗New cephalosporin cpds. and the production thereof 〖合成方法〗The reaction of 3-(chloromethyl)-7-(phenylacetamido)-3-cephem-4-carboxylic acid 4-methoxybenzyl ester (I) with triphenylphosphine and NaI in acetone gives the corresponding phosphonium salt (II), which is condensed with 4-methylthiazole-5-carboxaldehyde (III) by means of NaHCO3 in dichloromethane affording 3-[2(Z)-(4-methylthiazol-5-yl)vinyl]-7-(phenylacetamido)-3-cephem-4-carboxylic acid 4-methoxybenzyl ester (IV). The cleavage of the amido group of (IV) with PCl5 and pyridine yields the 7-amino compound (V), which is condensed with 2-(methoxyimino)-2-[2-(tritylamino)thiazol-4-yl]acetic acid (VI) by means of POCl3 in dichloromethane giving 3-[2(Z)-(4-methylthiazol-5-yl)vinyl]-7-[2(Z)-methoxyimino)-2-(2-tritylamino)thiazol-4-yl)acetamido]-3-cephem-4-carboxylic acid 4-methoxybenzyl ester (VII). The deprotection of (VII) with trifluoroacetic acid and anisole yields the free amino acid (VIII), which is finally esterified with iodomethyl pivalate (IX) in DMF. |
5楼2009-03-23 22:32:57
