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Organic letters

Synthesis of functionalized 2H-1-benzopyrans by DBU-catalyzed reactions of salicylic aldehydes with allenic ketones and esters.


PMID 16178575

Abstract

[reaction: see text] DBU-catalyzed reactions of salicylic aldehydes with 3-methylpenta-3,4-dien-2-one, 3-benzylpenta-3,4-dien-2-one, or ethyl 2-methylbuta-2,3-dienoate gave the corresponding functionalized 2H-1-chromenes in good to excellent yields and good diastereoselectivities in some cases in DMSO, respectively.