Perhydro-1,3-benzoxazines derived from (−)-8-aminomenthol as ligands for the catalytic enantioselective addition of diethylzinc to aldehydes
作者:Celia Andrés、Rebeca Infante、Javier Nieto
DOI:10.1016/j.tetasy.2010.07.016
日期:2010.9
The catalytic potency of a series of perhydro-1,3-benzoxazines prepared from (−)-8-aminomenthol was examined in the enantioselective addition of diethylzinc to aldehydes. When (2R,3S,3aS,4aR,6R,8aS)-2-isopropyl-6,9,9-trimethyl-3-phenyldecahydro-4aH-pyrrolo[2,1-b][1,3]benzoxazin-3-ol 7b was used as a chiral ligand, 1-substituted propanols with an (R)-configuration were obtained in high yields and enantiomeric
在将二乙基锌对醛进行对映选择性加成反应中,研究了由(-)-8-氨基薄荷醇制得的一系列全氢-1,3-苯并恶嗪的催化效能。当(2 R,3 S,3a S,4a R,6 R,8a S)-2-异丙基-6,9,9-三甲基-3-苯基十氢-4a H-吡咯并[ 2,1- b ] [1 ,3]苯并恶嗪-3-醇7b用作手性配体,以高收率获得具有(R)-构型的1-取代的丙醇,对映体过量高达> 99%。可以回收并使用催化剂,而不会损失其活性。