Title

Vanadyl Acetylacetonate Catalyzed Methylenation of Imidazo[1,2-a]pyridines by Using Dimethylacetamide as a Methylene Source: Direct Access to Bis(imidazo[1,2-a]pyridin-3-yl)methanes

Document Type

Article

Date of Original Version

6-30-2016

Abstract

An efficient protocol has been developed for the methylenation of imidazo[1,2-a]pyridines using dimethylacetamide (DMA) as methylene source in the presence of vanadyl acetylacetonate [VO(acac)2] as the catalyst and iodobenzene diacetate as the oxidant. The reaction involves coupling of sp3- and sp2-hybridized carbons and proceeds through the formation of an iminium ion. A wide variety of imidazo[1,2-a]pyridines were converted to bis(imidazo[1,2-a]pyridin-3-yl)methanes in good to excellent yields. A gram-scale reaction demonstrated the potential for the scale-up processes. (Figure presented.) .

Publication Title

Advanced Synthesis and Catalysis

Volume

358

Issue

13

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