Studies toward the total synthesis of 1-oxacephalosporins 3: synthesis of a (±)-trans-7-benzoylamino-3-carbamoyloxymethyl-1-oxa-3-cepheh-3-carboxylate from 1,3-dihydroxyacetone
作者:Hans Schmincke、Dieter Hoppe
DOI:10.1016/0040-4020(89)80100-0
日期:1989.1
strategy in the total synthesis of 1-oxacephalosporins the title compound 12 was constructed from 1,3-dihydroxy=acetone, methyl isocyanoacetate, and azidoacetyl chloride in 10 steps. Inter=mediates are the -formyl α,β-dehydroaminoacid ester 5, the 1,3-thiazoline-4-carboxylate 6, the -methyl thioformimidate 7, the 4-azido-3-methylthio-2-azetidinone 8 and the oxazolinoazetidinone 11. The synthesis also includes
作为1-氧杂头孢菌素全合成中新策略的第一个例子,标题化合物12由1,3-二羟基=丙酮,异氰基乙酸甲酯和叠氮基乙酰氯分十步构建。间=介导是甲酰α,β-dehydroaminoacid酯5,1,3- thiazoline- 4 -羧酸叔丁酯6中,甲基thioformimidate 7中,4叠氮基3 -甲硫基-2-氮杂环丁酮8和oxazolinoazetidinone 11。该合成还包括碱基诱导的/异构化的不对称保护的γ,γ′-二羟基-β-甲基丁烯酸酯侧链在4-苯甲酰氨基-2-氮杂环丁酮9中。