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Photoinduced Decarboxylative Borylation of Carboxylic Acids

Alexander Fawcett, Johan Pradeilles, Yahui Wang, Tatsuya Mutsuga, Eddie L Myers, Varinder K Aggarwal

Science. 2017 Jul 21;357(6348):283-286.

PMID: 28619717

Abstract:

The conversion of widely available carboxylic acids into versatile boronic esters would be highly enabling for synthesis. We found that this transformation can be effected by illuminating the N-hydroxyphthalimide ester derivative of the carboxylic acid under visible light at room temperature in the presence of the diboron reagent bis(catecholato)diboron. A simple workup allows isolation of the pinacol boronic ester. Experimental evidence suggests that boryl radical intermediates are involved in the process. The methodology is illustrated by the transformation of primary, secondary, and tertiary alkyl carboxylic acids as well as a diverse range of natural-product carboxylic acids, thereby demonstrating its broad utility and functional group tolerance.

Chemicals Related in the Paper:

Catalog Number Product Name Structure CAS Number Price
AP13826272 Bis(catecholato)diboron Bis(catecholato)diboron 13826-27-2 Price
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