A highly stereoselective synthesis of the 1β-methylcarbapenem key intermediate from (R)-3-hydroxybutyric acid
作者:Yuko Kobayashi、Yoshio Ito、Shiro Terashima
DOI:10.1016/s0040-4020(01)80578-0
日期:1992.1
Baeyer-Villiger reaction accompanying novel cleavage of the acetal moiety. The Reformatsky reaction of 6 with sterically crowded 3-(2-bromopropionyl)-2-oxazolidone derivatives readily afforded the title key intermediate after sequential chemical manipulations.
(3R,4R)-4-乙酰氧基-3-[(R)-1-(甲酰氧基)乙基] -2-氮杂环丁酮6可以通过[2 + 2 ]从(R)-3-羟基丁酸高立体选择性地制备氯磺酰基异氰酸酯与2H,4H-1,3-二恶英衍生物的]-环加成反应和伴随乙缩醛部分新裂解的Baeyer-Villiger反应。6与空间拥挤的3-(2-溴丙酰基)-2-恶唑烷酮衍生物的Reformatsky反应在连续的化学操作后很容易提供标题关键中间体。