New bifunctional phosphines were prepared as chiral organocatalysts for the enantioselective [4+2] cycloaddition between α,β-unsaturated imines and methyl vinyl ketone. In the presence of 10 mol % of amide-phosphine, the [4+2] cycloaddition reaction was achieved in good-to-excellent yields (up to 95%) and diastereoselectivities (up to 99:1 dr) with moderate-to-good enantioselectivities (up to 82% ee)
制备了新的双功能膦作为手性有机催化剂,用于α,β-不饱和
亚胺与甲基
乙烯基酮之间的对映选择性[4 + 2]环加成。在10 mol%的酰胺膦存在下,[4 + 2]环加成反应的收率达到良好至优异(高达95%)和非对映选择性(高达99:1 dr),而中等至良好的对映选择性(最高ee达82%)。这种方法学为功能化的四氢
吡啶的不对称构建建立了新的协议。