Synthesis of functionalized chromans by P~nBu_3- catalyzed reactions of salicylaldimines and salicylaldehydes with allenic ester

摘要

P~nBu_3-catalyzed cyclization reactions of salicylaldimines and salicylaldehydes with ethyl 2,3-butadienoate gave the corresponding functionalized chromans in moderate to good yields in THF under mild conditions. The new reaction provides a new method for the synthesis of biologically active chroman products.