on a base, which goes through SN2-SN2 nucleophilic substitution and intramolecular Michael addition. The product structures are confirmed by x-ray crystallography, and a tentative mechanism of the cascade process is presented.
                                    由 
4-羟基
香豆素和 Baylis-Hillman 
溴化物衍生的 5-Oxo-2,3,4,5-
四氢吡喃并[3,2-c]色烯-3-
羧酸酯可在短时间内以优异的产率高效获得。转化依赖于碱基,它经历了 SN2-SN2 亲核取代和分子内迈克尔加成。X 射线晶体学证实了产物结构,并提出了级联过程的初步机制。