Ruthenium-catalyzed reduction of racemic tricarbonyl(η6-aryl ketone)chromium complexes using transfer hydrogenation: A simple alternative to the resolution of planar chiral organometallics
作者:Cleber V. Ursini、Gilson H.M. Dias、J. Augusto R. Rodrigues
DOI:10.1016/j.jorganchem.2005.03.048
日期:2005.7
resulted in optically active syn-(R,S)-(η6-aryl alcohol)Cr(CO)3 and (R)-(η6-aryl ketone)Cr(CO)3 compounds in 31–97% ee. Reduction of racemic (η6-thiochroman-4-one)Cr(CO)3 with the catalyst precursor generated from (+)-norephedrine, instead of (−)-ephedrine, inverted the configuration of the products obtained. Syn-(S,R)-(η6-thiochroman-4-ol)Cr(CO)3 and (S)-(η6-thiochroman-4-one)-Cr(CO)3 were isolated
外消旋平面手性(η 6 -芳基酮)的Cr(CO)3个配合物(芳基酮= -1-二氢茚酮,1-四氢萘酮,4-苯并二氢吡喃酮和二氢苯并噻喃-4-酮)通过回流以Cr(CO)芳基酮制备在二丁醚和THF的10∶1混合物中得到6。有机金属酮的通过转移氢化在含有KOH和催化剂前体的2-丙醇的减少,从将[RuCl产生2(η 6 -苯)] 2( - ) -麻黄碱,导致光学活性和顺- ([R ,小号) - (η 6 -芳基醇)的Cr(CO)3和(- [R )- (η 6 -芳基酮)的Cr(CO)在31–97%ee中包含3种化合物。外消旋的减少(η 6二氢苯并噻喃-4-酮)的Cr(CO)3与来自(+)所产生的催化剂前体-降麻黄碱代替( - ) -麻黄碱,反相获得的产物的结构。顺式- (小号,- [R )- (η 6二氢苯并噻喃-4-醇)的Cr(CO)3和(小号) - (η 6二氢苯并噻喃-4-酮)-Cr(CO)3分离的ee分别为49%和>