Hydroheteroarylation of Alkynes under Mild Nickel Catalysis
作者:Yoshiaki Nakao、Kyalo Stephen Kanyiva、Shinichi Oda、Tamejiro Hiyama
DOI:10.1021/ja0623459
日期:2006.6.1
Nickel complexes having a bulky tri(sec-alkyl)phosphine ligand catalyze hydroheteroarylation of alkynes at 35 degrees C. Selective activation of an Ar-H bond over an Ar-CN bond of N-protected 3-cyanoindoles is achieved by a proper choice of ligand and/or an N-protecting group. The catalysis is applicable to a diverse range of heteroarenes to afford cis-hydroheteroarylation products in highly chemo- and stereoselective manners. Excellent regioselectivity is observed with unsymmetrical alkynes to give the corresponding heteroaryl-substituted ethenes having a larger substituent trans to an aryl group.
Practical Approach for Hydroheteroarylation of Alkynes Using Bench-Stable Catalyst
作者:Yoshiaki Nakao、Kyalo Stephen Kanyiva、Tamejiro Hiyama