Regiocontrol by Halogen Substituent on Arynes: Generation of 3-Haloarynes and Their Synthetic Reactions

Abstract

The use of arynes as the highly reactive intermediates has attracted substantial attention in organic synthesis. To enhance the utility of arynes, the regiocontrol in the reactions of unsymmetrically substituted arynes is an important task. The introduction of halogen substituent at 3-position of arynes leads to the sufficient regiocontrol for various synthetic reactions. This short review highlights the utility of 3-haloarynes in organic synthesis. The distortion model for explaining the regioselectivity, the representative reactions of 3-haloarynes generated from polyhaloarenes, and the preparation and reactions of easily activatable aryne precursors are summarized.