Enantioselective reaction of α-lithiated thiazolidines as new chiral formyl anion equivalents
作者:Libo Wang、Shuichi Nakamura、Yuji Ito、Takeshi Toru
DOI:10.1016/j.tetasy.2004.08.010
日期:2004.10
The reaction of lithiated N-Boc-thiazolidine and N-Boc-benzothiazolidine with benzophenone in the presence of (−)-sparteine afforded the products with up to 97% ee and 93% ee, respectively. The reaction with various aromatic and aliphatic aldehydes also afforded the products with high enantioselectivity and moderate diastereoselectivity. Each diastereomer could be converted to optically active diols
在(-)-天冬氨酸的存在下,锂化的N - Boc-噻唑烷和N -Boc-苯并噻唑烷与二苯甲酮的反应分别提供了具有高达97%ee和93%ee的产物。与各种芳族和脂族醛的反应也提供了具有高对映选择性和中等非对映选择性的产物。每种非对映异构体都可以转化为旋光性二醇。因此,锂化的N -Boc-噻唑烷和N -Boc-苯并噻唑烷用作手性甲酰基阴离子等同物。确认反应通过动态热力学拆分途径进行。