Enantioselective Cyanosilylation of Ketones with Amino Acid/BINAP/Ruthenium(II)-Lithium Phenoxide Catalyst Systems
作者:Masato Uemura、Nobuhito Kurono、Yusuke Sakai、Takeshi Ohkuma
DOI:10.1002/adsc.201200027
日期:2012.7.9
Enantioselective reactions of simple ketones, α,α‐ and β,β‐dialkoxy ketones, and α‐alkoxy ketones with trimethylsilyl cyanide catalyzed by the bimetallic systems of amino acid/BINAP/ruthenium(II) complexes and lithium phenoxide have been studied [BINAP=2,2′‐bis(diphenylphosphino)‐1,1′‐binaphthyl]. The Ru(PhGly)2(BINAP)‐lithium phenoxide system showed high enantioselectivity for the reaction of acetophenone
研究了简单的酮,α,α和β,β-二烷氧基酮和α-烷氧基酮与氨基酸/ BINAP /钌(II)配合物和二氧化锂的双金属体系催化的三甲基甲硅烷基氰化物的对映选择性反应[BINAP = 2,2'-双(二苯基膦基)-1,1'-联萘基]。Ru(PhGly)2(BINAP)-苯酚锂体系对苯乙酮衍生物的反应具有很高的对映选择性,从而可以提供高达90%ee的氰化产物[PhGly =苯基甘氨酸]。对于二烷氧基酮和α-烷氧基酮的氰基硅烷化反应,Ru(t -Leu )2(BINAP)-苯酚氧化锂系统表现出最佳的催化剂性能,可生产ee高达99%ee和98%的氰醇衍生物ee分别[ t -Leu =叔亮氨酸]。在最佳情况下,出色的催化活性导致反应完全转化,底物与催化剂的摩尔比(S / C)为10,000。