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DABCO-Catalyzed Reaction of Allenic Esters and Ketones with Salicyl N-Tosylimines:  Synthesis of Highly Functionalized Chromenes

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posted on 2005-07-07, 00:00 authored by Yong-Ling Shi, Min Shi
DABCO-catalyzed reactions of salicyl N-tosylimines with ethyl 2,3-butadienoate and penta-3,4-dien-2-one proceed smoothly at room temperature in dichloromethane to give the corresponding chromenes in good to excellent yields.

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