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NEt 3-Promoted Construction of Functionalized 4 H-Chromenes via [4+2] Cycloaddition Reaction of ortho-Quinone Methides with β-Ketothioamides
Guangming Nan, Jingbo Zhan, Chunming Yuan, Lirong Wen, Ming Li
Chinese Journal of Organic Chemistry . 2021, (9): 3682 -3691 .  DOI: 10.6023/cjoc202104005