alkaline earth salt of/the/ methylsulfuric acid 在
三乙胺 作用下,
以65%的产率得到(+)-(3R,4S)-1-(3-butenyl)-4-[(2S)-2,2,-dimethyl-1,3-dioxolan-4-yl]-3-phenoxy-2-azetidinone
参考文献:
名称:
通过2-氮杂环丁酮系链的烯醛的分子内硝酮-烯烃环加成反应快速进入对映纯多环β-内酰胺
摘要:
New enantiomerically pure fused 2 or bridged 3 polycyclic beta-lactam systems are regio- and stereoselectively prepared via intramolecular nitrene-alkene cycloaddition of 2-azetidinone-tethered alkenyl-aldehydes 1. The regioselectivity of the cycloaddition can be tuned by moving the alkene substituent from N1 to C3 on the 2-azetidinone ring. (C) 1999 Elsevier Science Ltd. All rights reserved.