Functionalized o-bis(chloromethyl)pyridines as precursors for pyridine o-quinodimethane analogues and their [4+2] cycloadducts

Add time:07/14/2019    Source:sciencedirect.com

From oxazinones 4, precursors for pyridine o-quinodimethane analogues are made accessible via cycloaddition with 1,4-dichloro-2-butyne and propargyl chloride. Subsequent 1,4-elimination of the polyfunctional o-bis(chloromethyl)-pyridines affords both 2,3- and 3,4-dimethylene compounds, which are trapped in situ with various dienophiles.

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