A novel and efficient N,N'-dioxide-Gd(III) complex was developed for the highly diastereo- and enantioselective [3+2] cycloaddition of aryl oxiranyl diketones and aldehydes via C-C bond cleavage of oxiranes. The corresponding chiral 1,3-dioxolanes were obtained in excellent yields (up to 99%) with high diastereoselectivities (>95 : 5 dr) and enantioselectivities (up to 91% ee). Moreover, a possible
新型和有效的N,N'-dioxide-Gd(III)络合物被开发用于通过
环氧乙烷的CC键裂解对芳基
环氧乙烷基二酮和醛进行非对映选择性和对映选择性[3 + 2]环加成反应。以优异的产率(高达99%),高非对映选择性(> 95∶5dr)和对映选择性(高达91%ee)获得了相应的手性1,3-二
氧戊环。此外,提出了一个可能的过渡模型来解释不对称感应的起源。