Efficient, Rhodium-Catalyzed Hydrogenation of α-Dehydroamino Acid Esters with Chiral Monodentate Aminophosphanes Bearing Two Binaphthyl Groups
作者:Luc Eberhardt、Dominique Armspach、Dominique Matt、Loic Toupet、Benoît Oswald
DOI:10.1002/ejoc.200700533
日期:2007.11
appropriate dinaphtho-azepine. When reacted with [Rh(1,5-cyclooctadiene)2]BF4, highly active catalysts for the hydrogenation of α-dehydroamino acid esters were obtained. The highest enantioselectivities (up to 99 % ee) were achieved with the phosphoramidites having two chiral binaphthyl groups with opposite configurations. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
4-4,5-dihydro-3H-dinaphtho[2,1-c:1',2'-e]azepin-4-yl}dinaphtho[2,1-d:1',2'的所有四种立体异构体-f][1,3,2]dioxaphosphepine 由 (R 或 S)-1,1'-binaphthyl-2,2'-diyl chlorophosphite 和适当的 dinaphtho-azepine 制备。当与[Rh(1,5-环辛二烯)2]BF4反应时,得到了用于α-脱氢氨基酸酯加氢的高活性催化剂。使用具有两个相反构型的手性联萘基团的亚磷酰胺实现了最高的对映选择性(高达 99% ee)。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)