β-Lactams from ester enolates and silylimines: An enantiospecific synthesis of monocyclic β-lactams.
作者:Patrizia Andreoli、Laura Billi、Gianfranco Cainelli、Mauro Panunzio、Elisa Bandini、Giorgio Martelli、Giuseppe Spunta
DOI:10.1016/s0040-4020(01)86509-1
日期:1991.11
oxidation led to the optically active (3S, 4S ) 3-amino-4-acetoxy-β-laclam. The absolute configuration of this compound was determined by elaboration of this substrate to a key intermediate in the synthesis of the antibiotic “Aztreonam”. Nucleophilic displacement of the acetoxy group led to optically active 3-amino-4-alkyl (aryl)-azetidin-2-ones.
光学活性的3,4-二取代的氮杂环丁烷-2-酮已通过将(S)或(R)-丙醛衍生的手性甲硅烷基苯胺与2,2,5,5,-四甲基-1乙酯的烯醇酯脱核而制得1,2,5-氮杂二硅氮杂环丁烷-1-乙酸盐(STABASE)。β-内酰胺环的C-4位置上的羟乙基侧链氧化,然后进行Baeyer-Villiger氧化,产生旋光性(3S,4S)3-氨基-4-乙酰氧基-β-内酰胺。该化合物的绝对构型是通过将底物精加工成抗生素“氨曲南”合成中的关键中间体来确定的。乙酰氧基的亲核取代导致光学活性的3-氨基-4-烷基(芳基)-氮杂环丁烷-2-酮。