Catalytic Asymmetric Cyclopropanation of Allylic Alcohols with Titanium-TADDOLate: Scope of the Cyclopropanation Reaction
作者:André B. Charette、Carmela Molinaro、Christian Brochu
DOI:10.1021/ja0108382
日期:2001.12.1
titanium-TADDOLate complex was effective at catalyzing the cyclopropanation reaction of allylic alcohols in the presence 1 equiv of bis(iodomethyl)zinc. After initial optimization of the catalyst structure, excellent yields and enantiomeric ratios were obtained for 3-aryl- or 3-heteroaryl-substituted allylic alcohols (up to 97:3). Alkyl-substituted allylic alcohols gave modest yields and enantiomeric ratios (up
在 1 当量的双(碘甲基)锌存在下,亚化学计量的钛-TADDOLate 络合物可有效催化烯丙醇的环丙烷化反应。在对催化剂结构进行初步优化后,3-芳基-或3-杂芳基-取代的烯丙醇(高达97:3)获得了优异的产率和对映体比率。烷基取代的烯丙醇的产率和对映体比例适中(高达 87:13),但与其他亚化学计量手性配体观察到的相比,这些更有利。本文介绍了该反应的完整合成范围。