实现了非天然三肽作为靛红的不对称醛醇缩合反应的高度对映选择性有机催化剂的开发。以d-丙氨酸残基为C末端氨基酸残基的H-Pro-Gly- d -Ala-OH表现出最佳的对映选择性。H-Pro-Gly- d -Ala-OH催化的靛红反应生成的各种羟醛加合物的收率高达93%,ee高达97%。通过DFT计算对过渡态的研究表明,通过d-丙氨酸控制的空间环境实现了高光学纯度。
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