Ir-Catalyzed Enantioselective Hydrogenation of 2<i>H</i>-1,4-Benzoxazines with a Chiral 1,2,3,4-Tetrahydro-1-naphthylamine Derived Phosphine-aminophosphine Ligand
作者:Juan Hu、Daoyong Wang、Zhuo Zheng、Xiangping Hu
DOI:10.1002/cjoc.201200944
日期:2012.11
Unsymmetrical hybrid chiral phosphine‐aminophosphine ligandderived from 1,2,3,4‐tetrahydro‐1‐naphthylamine has been found to be highly efficient in the Ir‐catalyzed asymmetric hydrogenation of various 3‐aryl‐2H‐1,4‐benzoxazines, providing good enantioselectivities (up to 95% ee) and high catalytic activity (S/C up to 5000).
已发现衍生自1,2,3,4-四氢-1-萘胺的不对称杂化手性膦-氨基膦配体在各种3-芳基-2 H -1,4-苯并恶嗪的Ir催化不对称氢化中非常有效,提供良好的对映选择性(高达95%ee)和高催化活性(S / C高达5000)。
Efficient synthesis of 2,3-dihydro-1,4-benzoxazines via intramolecular copper-catalyzed O-arylation
作者:Zhangqin Liu、Yuanwei Chen
DOI:10.1016/j.tetlet.2009.04.055
日期:2009.7
A highly efficient synthetic approach to 2,3-dihydro-1,4-benzoxazines is described. The method involves a mild intramolecular copper-catalyzed O-arylation of beta aminoalcohol, which works well without N-protection. (C) 2009 Elsevier Ltd. All rights reserved.