Axially Chiral Phosphine-Oxazoline Ligands in Silver(I)- Catalyzed Asymmetric Mannich Reaction of Aldimines with Trimethylsiloxyfuran
作者:Hong-Ping Deng、Yin Wei、Min Shi
DOI:10.1002/adsc.200900550
日期:2009.11
A new asymmetric catalytic system for the Mannich reaction of aldimines with trimethylsiloxyfuran is described. The combination of an axially chiral phosphine-oxazoline ligand (S)-2-[(R)-2′-(diphenylphosphino)-1,1′-binaphthyl-2-yl]-4-phenyl-4,5-dihydrooxazole with silver acetate and 2,2,2-trifluoroacetic acid is a very effective catalytic system in the asymmetric Mannich reaction of various aldimines
描述了用于亚胺与三甲基甲硅烷氧基呋喃的曼尼希反应的新的不对称催化体系。轴向手性膦-恶唑啉配体(S)-2-[(R)-2'-(二苯基膦基)-1,1'-联萘-2-基] -4-苯基-4,5-二氢恶唑的组合乙酸亚银和2,2,2-三氟乙酸是多种亚胺与三甲基甲硅烷氧基呋喃在二氯甲烷中于-78°C发生的不对称曼尼希反应中非常有效的催化体系,可提供相应的加合物,收率高达99%,99:1(dr)和99%ee(主要的非对映异构体)在温和的条件下。