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Pd(ii)-Catalyzed enantioselective arylation of unbiased methylene C(sp3)–H bonds enabled by a 3,3′-F2-BINOL ligand†
Xu Yang,Meng-Xue Jiang,Tao Zhou,Ye-Qiang Han,Xue-Tao Xu,Kun Zhang
Chemical Communications Pub Date : 04/28/2021 00:00:00 , DOI:10.1039/D1CC01690C
Abstract

Palladium-catalyzed asymmetric functionalization of unbiased methylene C(sp3)–H bonds is a long-standing challenge. Here, we report a Pd(II)-catalyzed highly enantioselective arylation of unbiased methylene C(sp3)–H bonds enabled by a strongly coordinating bidentate 2-pyridinylisopropyl (PIP) directing group and an easily accessible 3,3′-F2-BINOL chiral ligand. The use of aryl iodides with the combination of 3,3′-F2-BINOL was beneficial for high enantiocontrol. A range of aliphatic amides and aryl iodides were tolerated, providing the desired arylated products in high enantioselectivities (up to 96% ee). The PIP directing group could be removed under mild conditions without erosion of enantiopurity.

Graphical abstract: Pd(ii)-Catalyzed enantioselective arylation of unbiased methylene C(sp3)–H bonds enabled by a 3,3′-F2-BINOL ligand
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