Regioselective [3 + 2] Cycloaddition Reaction of 3-Alkynoates with Seyferth–Gilbert Reagent
作者:Yu-Ting Tian、Fa-Guang Zhang、Jun-An Ma
DOI:10.1021/acs.joc.0c02957
日期:2021.2.19
A Et3N-triggered regioselective [3 + 2] cycloaddition reaction of 3-alkynoates with Seyferth–Gilbert reagent has been developed to furnish a series of trisubstituted pyrazole-3-phosphonates. A one-pot cycloaddition/alkylation sequence further offered access to the corresponding fully substituted pyrazoles.
Rhodium(III)-Catalyzed Intermolecular Hydroarylation of Alkynes
作者:Derek J. Schipper、Marieke Hutchinson、Keith Fagnou
DOI:10.1021/ja103080d
日期:2010.5.26
The rhodium(III)-catalyzed hydroarylation of internal alkynes is described. Good yields are obtained for a variety of alkynes, and excellent regioselectivity is observed for unsymmetrically substituted alkynes. The reaction also gives good yields for a range of arenes. Preliminary mechanistic investigations suggest that this reaction proceeds through arene metalation with the cationic rhodium catalyst, which enables challenging intermolecular reactivity.