β-Lactam Ring Opening in the Reformatsky Reaction of (3R,4R)-4-Acetoxy-3-((1R)-1-{[tert-butyl(dimethyl)silyl]oxy}ethyl)azetidin-2-one with Ethyl 4-Bromo-3-oxopentanoate
作者:Z. R. Valiullina、A. M. Galeeva、M. S. Miftakhov
DOI:10.1134/s1070428021090116
日期:2021.9
Abstract The Reformatskyreaction of (3R,4R)-4-acetoxy-3-((1R)-1-[tert-butyl(dimethyl)silyl]oxy}ethyl)azetidin-2-one with ethyl 4-bromo-3-oxopentanoate gave product of replacement of the acetoxy group by C2-carbanion of the β-keto ester, which underwent retro-aza-Michael reaction with opening of the azetidinone ring with the formation of acyclic ethyl (2Z,4S,5R)-4-carbamoyl-5-[tert-butyl(dimeth
摘要 (3 R ,4 R )-4-乙酰氧基-3-((1 R )-1-[叔丁基(二甲基)甲硅烷基]氧基}乙基)氮杂环丁烷-2-酮与4-溴乙基的Reformatsky反应-3-氧代戊酸酯得到乙酰氧基被β-酮酯的C 2 -碳负离子取代的产物,其经历逆氮杂-迈克尔反应,氮杂环丁酮环打开,形成无环乙基(2 Z ,4 S ,5 R )-4-氨基甲酰基-5-[叔丁基(二甲基)甲硅烷基]氧基}-2-丙酰基己-2-烯酸酯。后者的处理与二-叔丁基酯,得到己-3-烯酸甲酯和二氢吡啶-6-酮衍生物。