Nuclear analogs of β-lactam antibiotics. XIX. Syntheses of racemic and enantiomeric p-nitrobenzyl carbapen-2-em-3-carboxylates
作者:Yasutsugu Ueda、Christopher E. Damas、Vivianne Vinet
DOI:10.1139/v83-391
日期:1983.10.1
Racemic and enantiomeric p-nitrobenzyl carbapen-2-em-3-carboxylates 3, 3a, and 3b were prepared starting from inexpensive sorbic acid through the key intermediates, azetidinone esters 4, thus establishing a total synthesis of the p-nitrobenzyl ester of a natural product SQ 27,860. Optical resolution was achieved readily on azetidinone menthyl esters, 12. The absolute configurations were also established
从廉价的山梨酸开始,通过关键中间体氮杂环丁酮酯 4 制备了外消旋和对映异构对硝基苄基碳烯-2-em-3-羧酸酯 3、3a 和 3b,从而建立了对硝基苄酯的全合成天然产品 SQ 27,860。对氮杂环丁酮薄荷酯 12 很容易实现光学拆分。还建立了绝对构型。