Bicyclo[3.1.0]hexanes from sugar-derived diazo compounds and iodonium ylides. Diastereocontrol and synthetic applications
作者:John K Gallos、Theocharis V Koftis、Zoe S Massen、Constantinos C Dellios、Ioannis T Mourtzinos、Evdoxia Coutouli-Argyropoulou、Alexandros E Koumbis
DOI:10.1016/s0040-4020(02)01002-5
日期:2002.9
The CuI and Rh2(OAc)4 catalyzed decomposition of ethyl 2-diazo-4,5-isopropylidenedioxy-3-oxo-6-heptenoate results in intramolecular cyclopropanation products with opposite diastereoselectivity. In contrast, decomposition of the respective iodonium ylide can proceed without catalysts to give the cyclopropanation products with diastereoselectivity unchangeable by the presence of CuI and Rh2(OAc)4, revealing
CuI和Rh 2(OAc)4催化2-重氮-4,5-异丙基二烯二氧基-3-氧代-6-庚烯酸乙酯的分解,产生非对映选择性相反的分子内环丙烷化产物。相反,各碘鎓叶立德的分解可在没有催化剂的情况下进行,从而得到具有非对映选择性的环丙烷化产物,由于CuI和Rh 2(OAc)4的存在而不能改变,因此表明,在这种特殊情况下,该反应是亲电子加成碘鎓中心至双键。通过制备许多环戊基,环丙基和双环[3.1.0]己基抗病毒碳环核苷的前体,已经证明了这些反应的综合重要性。