Synthesis 2023; 55(08): 1260-1266
DOI: 10.1055/a-1979-6009
paper

Synthesis of Five-Membered Organoborate Heterocycles via a Metal-Free Carboboration and Their Use in Cross-Coupling Reactions

Isabel Valencia
,
David Sucunza
,
Patricia García-García
,
Adrián Pérez-Redondo
,
Juan J. Vaquero
We are grateful to the Ministerio de Ciencia e Innovación, AEI, and FEDER (project PID2020-115128RB-I00 and FPU predoctoral grant for I.V.) and the Instituto de Salud Carlos III (FEDER funds, ISCIII RICORS20­40 RD21/0005/0016) for financial support.


Abstract

Treatment of various vinylbenzopyridines with allyl(dichloro)borane affords five-membered organoborate heterocycles via a metal-free carboboration. The reaction between these organoborates and Grignard reagents increases the number of derivatives belonging to this novel family of four-coordinate organoboron compounds. Some of them were used as reagents in phenylations and methylations in moderate to high yields under standard palladium-catalyzed cross-coupling reaction conditions.

Supporting Information



Publication History

Received: 25 October 2022

Accepted after revision: 15 November 2022

Accepted Manuscript online:
15 November 2022

Article published online:
30 January 2023

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