Expanding available pyrazole substitution patterns by sydnone cycloaddition reactions
作者:A.W. Brown、J.P.A. Harrity
DOI:10.1016/j.tet.2017.04.049
日期:2017.6
We report the use of alkynylsilanes for the regiocontrolled synthesis of pyrazoles from functionalised sydnones. The strategies outlined herein allow a range of pyrazoles to be accessed with substitution patterns that are otherwise not directly obtained with high selectivity by alkyne cycloadditions. Moreover, this study serendipitously highlighted a simple and convenient procedure for the synthesis
A Mild and Regioselective Route to Fluoroalkyl Aromatic Compounds via Directed Cycloaddition Reactions
作者:David L. Cousins、Yee Hwee Lim、Joseph P. A. Harrity
DOI:10.1021/acs.joc.2c00800
日期:2022.8.5
The synthesis of perfluoroalkyl-substituted (hetero)arenes by benzannulation strategies is complementary to ring functionalization approaches as it obviates the need for pre-existing functionality and innate regiocontrol. We report a mild and regiospecific boron-directed benzannulation method as a vehicle for accessing a range of perfluoroalkyl-substituted (hetero)aromatic building blocks that can