1,3-Dipolar cycloaddition of diazoacetate compounds to terminal alkynes promoted by Zn(OTf)2: an efficient way to the preparation of pyrazoles
摘要:
A series of pyrazoles were prepared in good yields via 1,3-dipolar cycloaddition of diazoacetate compounds to terminal alkynes promoted by Zn(OTf)(2) under mild conditions. It was Supposed that the reaction was through the intermediate of Zn alkynilide. (C) 2009 Elsevier Ltd. All rights reserved.