Dipeptide-Catalyzed Asymmetric Aldol Condensation of Acetone with (N-Alkylated) Isatins
作者:Gianluigi Luppi、Pier Giorgio Cozzi、Magda Monari、Bernard Kaptein、Quirinus B. Broxterman、Claudia Tomasini
DOI:10.1021/jo050257l
日期:2005.9.1
The aldol condensation of acetone with several isatins is described. The desired compound was obtained in quantitative yield and with good enantioselectivities up to 77%. The best results were obtained with 10 mol % H-d-Pro-l-β3-hPhg-OBn as a catalyst, resulting in the preferential formation of the (R)-enantiomer. The absolute configuration of the newly formed chiral center has been assigned by an
描述了丙酮与几种isatins的醛醇缩合反应。以定量收率获得所需化合物,对映体选择性高达77%。的最好的结果是10%(摩尔)H-获得d -Pro-升-β 3 -hPhg-OBN作为催化剂,导致优先形成的(共- [R )-对映体。通过分子的X射线衍射研究和CD光谱分析确定了新形成的手性中心的绝对构型。