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通过催化剂调控的区域和对映选择性C(sp)-C(sp)偶联实现对手性C2-和C3-烷基化吡咯烷的发散式合成

Divergent Access to Chiral C2- and C3-Alkylated Pyrrolidines by Catalyst-Tuned Regio- and Enantioselective C(sp)-C(sp) Coupling.

作者信息

Wang Xuchao, Xue Jing, Rong Zi-Qiang

机构信息

Frontiers Science Center for Flexible Electronics (FSCFE), Shaanxi Institute of Flexible Electronics (SIFE) & Shaanxi Institute of Biomedical Materials and Engineering (SIBME), Northwestern Polytechnical University (NPU), 127 West Youyi Road, Xi'an, Shaanxi 710072, China.

出版信息

J Am Chem Soc. 2023 Jul 19;145(28):15456-15464. doi: 10.1021/jacs.3c03900. Epub 2023 Jun 12.

Abstract

Novel-substituted pyrrolidine derivatives are widely used in drugs and bioactive molecules. The efficient synthesis of these valuable skeletons, especially enantiopure derivatives, is still recognized as a key bottleneck to overcome in chemical synthesis. Herein, we report a highly efficient catalyst-tuned regio- and enantioselective hydroalkylation reaction for the divergent synthesis of chiral C2- and C3-alkylated pyrrolidines through desymmetrization of the readily available 3-pyrrolines. The catalytic system consists of CoBr with a modified bisoxazoline (BOX) ligand, which can achieve the asymmetric C(sp)-C(sp) coupling via the distal stereocontrol, providing a series of C3-alkylated pyrrolidines in high efficiency. Moreover, the nickel catalytic system allows the enantioselective hydroalkylation to synthesize the C2-alkylated pyrrolidines through the tandem alkene isomerization/hydroalkylation reaction. This divergent method uses readily available catalysts, chiral BOX ligands, and reagents, delivering enantioenriched 2-/3-alkyl substituted pyrrolidines with excellent regio- and enantioselectivity (up to 97% ee). We also demonstrate the compatibility of this transformation with complex substrates derived from a series of drugs and bioactive molecules in good efficiency, which offers a distinct entry to more functionalized chiral -heterocycles.

摘要

新型取代吡咯烷衍生物广泛应用于药物和生物活性分子中。这些有价值骨架的高效合成,尤其是对映体纯的衍生物,仍然被认为是化学合成中需要克服的关键瓶颈。在此,我们报道了一种高效的催化剂调控的区域和对映选择性氢烷基化反应,通过对易得的3-吡咯啉进行去对称化,用于手性C2-和C3-烷基化吡咯烷的发散合成。催化体系由CoBr与修饰的双恶唑啉(BOX)配体组成,其可以通过远程立体控制实现不对称C(sp)-C(sp)偶联,高效地提供一系列C3-烷基化吡咯烷。此外,镍催化体系允许通过串联烯烃异构化/氢烷基化反应进行对映选择性氢烷基化以合成C2-烷基化吡咯烷。这种发散方法使用易得的催化剂、手性BOX配体和试剂,以优异的区域和对映选择性(高达97% ee)提供对映体富集的2-/3-烷基取代吡咯烷。我们还证明了这种转化与源自一系列药物和生物活性分子的复杂底物具有良好的兼容性,这为更功能化的手性杂环提供了一条独特的途径。

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