The gold(I)-catalyzed aldol reaction utilizing chiral ferrocenylamine ligands: Synthesis of N-benzyl-substituted ligands
作者:Stephen D. Pastor、Rudolf Kesselring、Antonio Togni
DOI:10.1016/0022-328x(92)83189-o
日期:1992.5
The synthesis and characterization of (R)-N-2-[(R)-N-2-hydroxy-1-propyl-N-benzyl]aminoethyl}-N-benzyl-1-[(S)-1′,2-bis(diphenylphosphino)ferrocenyl]ethyl amine (9) and selected carbamate esters is described. The stereoselectivity of the gold(I)-catalyzed reaction of benzaldehyde with methyl iso-cyanoacetate was compared using the N-benzyl-substituted versus the corresponding N-methyl-substituted ferrocenylamine
(R)-N- 2-[(R)-N -2-羟基-1-丙基-N-苄基]氨基乙基} -N-苄基-1-[(S)-1'的合成与表征,描述了2-双(二苯基膦基)二茂铁基]乙胺(9)和选择的氨基甲酸酯。使用N-苄基取代的与相应的N-甲基取代的二茂铁基胺配体比较了苯甲醛与异氰基乙酸甲酯的金(I)催化的反应的立体选择性。使用N获得的较低的非对映异构和对映选择性-苄基取代的二茂铁基胺配体与为具有中心和平面手性的二茂铁基胺配体的金(I)-催化的醇醛缩合反应的立体选择步骤提出的过渡态模型相一致。