Highly Enantioselective Conjugate Addition of Thioglycolate to Chalcones Catalyzed by Lanthanum: Low Catalyst Loading and Remarkable Chiral Amplification
作者:Yonghai Hui、Jun Jiang、Wentao Wang、Weiliang Chen、Yunfei Cai、Lili Lin、Xiaohua Liu、Xiaoming Feng
DOI:10.1002/anie.201000105
日期:——
Ramping it up: The titled reaction has been developed using a chiral N,N′‐dioxide–LaIII complex as the catalyst. The reaction proceeded with high yield and enantioselectivity. Remarkably, a high asymmetric amplification was observed, as 98 % ee was achieved using 1 mol % L/La(OTf)3 in which the ee value of L was 2 % ee. Tf=trifluoromethanesulfonyl.
加强:使用手性N,N'-二氧化物-La III络合物作为催化剂,开发了标题反应。反应以高产率和对映选择性进行。显着地观察到高的不对称扩增,因为使用1mol%的L / La(OTf)3达到98% ee,其中L的ee 值为2% ee。Tf =三氟甲磺酰基。