Bulky<i>P*</i>-Chirogenic Diazaphospholidines as Monodentate Ligands for Asymmetric Catalysis
作者:Konstantin N. Gavrilov、Eduard B. Benetskiy、Tatiana B. Grishina、Eugenie A. Rastorguev、Marina G. Maksimova、Sergey V. Zheglov、Vadim A. Davankov、Benjamin Schäffner、Armin Börner、Stephane Rosset、Gaelle Bailat、Alexandre Alexakis
DOI:10.1002/ejoc.200900058
日期:2009.8
been designed and developed. Ligands of this type exhibited high enantioselectivities in Pd-catalysed allylic substitution reactions of (E)-1,3-diphenylallyl acetate with NaSO2pTol (up to 87 % ee), CH2(CO2Me)2 (up to 92 % ee), (C3H7)2NH (up to 93 % ee) and (CH2)4NH (up to 99 % ee). These novel stereoselectors have also been successfully employed in Rh-catalysed asymmetric hydrogenations of dimethyl itaconate
一系列基于 (2R,5S)-3-phenyl-1,3-diaza-2-phosphabicyclo[3.3.0] 辛烷和 (2R,5S)-3-(p-溴苯基)-1,3-二氮杂-2-磷杂双环[3.3.0]辛烷主链已被设计和开发。这种类型的配体在 Pd 催化的 (E)-1,3-二苯基烯丙基乙酸酯与 NaSO2pTol(高达 87% ee)、CH2(CO2Me)2(高达 92% ee)、(C3H7)的烯丙基取代反应中表现出高对映选择性)2NH(高达 93% ee)和 (CH2)4NH(高达 99% ee)。这些新型立体选择剂也已成功用于 Rh 催化的衣康酸二甲酯(最高 76% ee)、甲基 (Z)-2-乙酰氨基-3-苯基丙烯酸酯(最高 73% ee)和 2-乙酰氨基丙烯酸甲酯(高达 98% ee)。