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报道了氮杂环卡宾催化烯酮与氰基查尔酮的[4+2]不对称环加成反应.通过L-焦谷氨酸衍生的大位阻卡宾催化烯酮与氰基查尔酮反应,以良好的产率、良好的顺反选择性和优良的对映选择性得到相应的手性多取代二氢吡喃酮类化合物.
The [4 + 2] asymmetric cycloaddition reaction of enone and cyanate chalcone catalyzed by aza-heterocyclic carbenes was reported.According to the enantioselectivity of enketene and cyano-chalcone catalyzed by L-pyroglutamic acid, The corresponding chiral polysubstituted dihydropyranones were obtained with good yield, good cis-trans selectivity and excellent enantioselectivity.