Enantioselective addition of terminal alkynes to N-(diphenylphosphinoyl)imines catalyzed by Zn–BINOL complexes
作者:Gonzalo Blay、Eric Ceballos、Alicia Monleón、José R. Pedro
DOI:10.1016/j.tet.2012.01.037
日期:2012.3
Chiral nonracemic N-(diphenylphosphinoyl)-protected propargylic amines have been prepared by addition of terminal alkynes to N-(diphenylphosphinoyl)aldimines in the presence of dimethylzinc and 3,3'-dibromo-BINOL as catalyst. The reaction works with a variety of aromatic and heteroaromatic aldimines and with different alkynes, providing the expected products in generally good yields and enantiomeric excesses (up to 96%). (C) 2012 Elsevier Ltd. All rights reserved.
Merging Nucleophilic and Hydrogen Bonding Catalysis: An Anion Binding Approach to the Kinetic Resolution of Propargylic Amines
作者:Eric G. Klauber、Chandra Kanta De、Tejas K. Shah、Daniel Seidel
DOI:10.1021/ja105337h
日期:2010.10.6
An efficient kinetic resolution of primary propargylic amines with s-factors of up to 56 is reported. The strategy is based on a dual catalytic approach, namely the use of a newly developed and easy-to-make thiourea-amide anion binding catalyst in combination with 4-(dimethylamino)pyridine (DMAP), both employed at a 5 mol% catalyst loading. Benzylic amines are also resolved with s-factors of up to 38.