Asymmetric [4 + 2] cycloaddition of optically pure 1-aminodiene 1 onto substituted phosphonodienophiles 2 and 4 provided respectively chiral β- and γ-amidophosphonocyclohexenes with good selectivities. The absolute stereochemistry of the major diastereoisomer was experimentally proved by NMR experiments and the facial selectivity of diene 1 is discussed on the basis of ab initio calculations.
将光学纯度为 1-aminodiene 1 与取代的膦二烯类化合物 2 和 4 进行不对称 [4 + 2] 环加成,可分别得到手性 δ- 和 δ³-
氨基膦
环己烯,并具有良好的选择性。核磁共振实验证明了主要非对映异构体的绝对立体
化学性质,并根据 ab initio 计算讨论了二烯 1 的面选择性。