A highly effective synthesis of 2-alkynyl-7-azaindoles: Pd/C-mediated alkynylation of heteroaryl halides in water
摘要:
The reaction of 4-chloro-2-iodo-7-azaindole with terminal alkynes was investigated using 10% Pd/C-PPh3-Cul as a catalyst system in water. This study afforded a new, mild and selective process for the preparation of 2-alkynyl-4-chloro-7-azaindole in good yields via C-C bond forming reaction. The resulting chloro, derivative can be functionalized further via another Pd-mediated C-C bond forming reaction with arylboronic acid. (C) 2009 Elsevier Ltd. All rights reserved.