Asymmetric desymmetrization has been demonstrated to be a powerful strategy for building stereocenters in asymmetric synthesis. Herein, a Pd/Cu catalyzed asymmetric desymmetrization reaction with a simple geminal dicarboxylate is reported. A wide scope of imino esters bearing an aryl or heteroaromatic group were compatible with this bimetallic catalytic system. The reactions proceeded smoothly, giving the desired products in good yields with high to excellent regio-, diastereo-, and enantioselectivity (up to 20 : 1 branched:linear, >20 : 1 dr, >99 % ee). Notably, the reaction favored branched selectivity, which is unusual for the Pd-catalyzed allylic alkylation reaction. In addition, the standard product could be easily transformed to other valuable molecules such as chiral allylic alcohols, carbamates, and organic boron compounds. Furthermore, DFT calculations were conducted to explain the origin of the branched selectivity.

中文翻译：

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通过分支选择性 Pd/Cu 催化的烯丙基取代对简单二羧酸盐进行立体发散去对称化。

不对称去对称化已被证明是在不对称合成中构建立体中心的有力策略。本文报道了 Pd/Cu 催化的不对称去对称化反应与简单的偕二羧酸盐。带有芳基或杂芳基的多种亚氨基酯与这种双金属催化体系相容。反应顺利进行，以良好的收率得到所需的产物，具有高至优异的区域选择性、非对映选择性和对映选择性（高达 20:1 的支链：线性，>20:1 dr，>99 % ee）。值得注意的是，该反应有利于支链选择性，这对于 Pd 催化的烯丙基烷基化反应是不寻常的。此外，标准产品可以很容易地转化为其他有价值的分子，例如手性烯丙醇、氨基甲酸酯和有机硼化合物。