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【结 构 式】

【分子编号】40052

【品名】4-nitrobenzyl (6R,7R)-3-hydroxy-8-oxo-7-[[2-(2-thienyl)acetyl]amino]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate

【CA登记号】

【 分 子 式 】C20H17N3O7S2

【 分 子 量 】475.503

【元素组成】C 50.52% H 3.6% N 8.84% O 23.55% S 13.49%

与该中间体有关的原料药合成路线共 1 条

合成路线1

该中间体在本合成路线中的序号:(III)

The ozonolysis of p-nitrobenzyl ester of 7-amino-3-methylenecephem-4-carboxylic acid (I) in CH2Cl2 gives the p-nitrobenzyl ester of 7-amino-3-hydroxy-3-cephem-4-carboxylic acid (II), which is then condensed with thiophene-2-acetyl chloride (A) in aqueous THF to afford p-nitrobenzyl ester of 7-(thiophene-2-acetamido)-3-hydroxy-3-cephem-4-carboxylic acid (III). The chlorination of (III) with SOCl2, PCl3, POCl3, (COCl)2 or COCl2 in DMF yields p-nitrobenzyl ester of 7-(thiophene-2-acetamido)-3-chloro-3-cephem-4-carboxylic acid (IV), which is then partially hydrolyzed with dry pyridine and PCl5 giving p-nitrobenzyl ester of 7-amino-3-chloro-3-cephem-4-carboxylic acid (V). This compound can be acylated easily to p-nitrobenzyl ester of 7-(D-alpha-phenylglycylamido)-3-chloro-3-cephem-4-carboxylic acid (VI), which is finally hydrogenolyzed with Zn and conc. HCl. An alternative way starting also from (V) is its hydrogenolysis with H2 over Pd/C in THF-MeOH giving the 7-amino-3-chloro-3-cephem-4-carboxylic acid (VII), which is then acylated as usual.

1 Bogan, J.A.; Castaner, J.; Cefaclor. Drugs Fut 1977, 2, 6, 369.
2 Chauvette, R.R. (Eli Lilly and Company); Alpha-aminoacyl-3-halo-cephalosporins. DE 2408698; ES 423531; FR 2218877; GB 1461323; JP 49110689; JP 56138190 .
3 Chauvette, R.R.; Pennington, P.A.; Chemistry of cephalosporin antibiotics. 30. 3-Methoxy- and 3-halo-3-cephems. J Med Chem 1975, 18, 4, 403-8.
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
(A) 15673 2-(2-thienyl)acetyl chloride; 2-Thiopheneacetyl chloride 39098-97-0 C6H5ClOS 详情 详情
(I) 40050 4-nitrobenzyl (6R,7R)-7-amino-3-methylene-8-oxo-5-thia-1-azabicyclo[4.2.0]octane-2-carboxylate C15H15N3O5S 详情 详情
(II) 40051 4-nitrobenzyl (6R,7R)-7-amino-3-hydroxy-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate C14H13N3O6S 详情 详情
(III) 40052 4-nitrobenzyl (6R,7R)-3-hydroxy-8-oxo-7-[[2-(2-thienyl)acetyl]amino]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate C20H17N3O7S2 详情 详情
(IV) 40053 4-nitrobenzyl (6R,7R)-3-chloro-8-oxo-7-[[2-(2-thienyl)acetyl]amino]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate C20H16ClN3O6S2 详情 详情
(V) 40054 4-nitrobenzyl (6R,7R)-7-amino-3-chloro-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate C14H12ClN3O5S 详情 详情
(VI) 40056 4-nitrobenzyl (6R,7R)-7-[[(2R)-2-amino-2-phenylethanoyl]amino]-3-chloro-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate C22H19ClN4O6S 详情 详情
(VII) 40057 (6R,7R)-7-amino-3-chloro-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid C7H7ClN2O3S 详情 详情
(VIII) 40058 4-(chloromethyl)-2,3,5-trimethylphenyl methyl ether; 2-(chloromethyl)-5-methoxy-1,3,4-trimethylbenzene C11H15ClO 详情 详情
Extended Information