Issue 29, 2017

DDQ-promoted direct C5-alkylation of oxazoles with alkylboronic acids via palladium-catalysed C–H bond activation

Abstract

A novel and concise C5-alkylation of oxazoles using alkylboronic acids as alkyl donors via Pd(II)-catalysed C–H bond activation has been achieved in moderate to good yields with satisfactory functional group tolerance. Instead of commonly used BQ as a key promoter, DDQ was discovered to be a better additive that significantly promoted this alkylation. This efficient and advanced method represents the first C(sp2)–C(sp3) cross-coupling reaction at the C5-position of oxazoles, which is particularly attractive due to its potential applications in the late-stage functionalization of oxazole-containing bioactive molecules.

Graphical abstract: DDQ-promoted direct C5-alkylation of oxazoles with alkylboronic acids via palladium-catalysed C–H bond activation

Supplementary files

Article information

Article type
Communication
Submitted
04 May 2017
Accepted
01 Jul 2017
First published
03 Jul 2017

Org. Biomol. Chem., 2017,15, 6084-6088

DDQ-promoted direct C5-alkylation of oxazoles with alkylboronic acids via palladium-catalysed C–H bond activation

B. Lei, X. Wang, L. Ma, H. Jiao, L. Zhu and Z. Li, Org. Biomol. Chem., 2017, 15, 6084 DOI: 10.1039/C7OB01083D

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