Catalytic Asymmetric Cyclopropanation of Enones with Dimethyloxosulfonium Methylide Promoted by a La−Li<sub>3</sub>−(Biphenyldiolate)<sub>3</sub> + NaI Complex
作者:Hiroyuki Kakei、Toshihiko Sone、Yoshihiro Sohtome、Shigeki Matsunaga、Masakatsu Shibasaki
DOI:10.1021/ja076797c
日期:2007.11.1
Catalytic asymmetric cyclopropanation of enones with dimethyloxosulfonium methylide using a La−Li3−(biphenyldiolate)3 + NaI complex is described. The present method is complementary to the previously reported catalytic enantioselective methods in terms of ylides used, and trans products were exclusively obtained in good yield (96−73%) and high enantioselectivity (99−84% ee). Use of biphenyldiol 1b-H2
描述了使用 La−Li3−(biphenyldiolate)3 + NaI 复合物对烯酮与二甲基氧锍甲基化物的催化不对称环丙烷化反应。本方法在使用的叶立德方面是对先前报道的催化对映选择性方法的补充,并且反式产物仅以良好的产率 (96-73%) 和高对映选择性 (99-84% ee) 获得。联苯二醇 1b-H2 和 NaI 添加剂的使用对于实现高对映选择性至关重要。