Synthesis of 3,5-Disubstituted Pyrazoles via Cope-Type Hydroamination of 1,3-Dialkynes
摘要:
An efficient method for the synthesis of 3,5-disubstituted pyrazoles is described. The reactions of 1,3-dialkynes with hydrazine proceeded smoothly in dimethyl sulfoxide under mild reaction conditions to produce 3,5-disubstituted pyrazoles in satisfactory to excellent yields. A one-pot procedure of the transformation has been developed.
A co-operative Ni–Cu system for C<sub>sp</sub>–C<sub>sp</sub> and C<sub>sp</sub>–C<sub>sp2</sub> cross-coupling providing a direct access to unsymmetrical 1,3-diynes and en-ynes
作者:Nirmalya Mukherjee、Debasish Kundu、Brindaban C. Ranu
DOI:10.1039/c4cc07413k
日期:——
An efficient cross coupling of alkynes with alkynyl and alkenyl halides catalysed by a Ni–Cu system without any ligand leading to the synthesis of a series of functionalised 1,3-di-ynes and en-ynes has been achieved.