Copper Catalyzed sp3 C-H Alkenylation

28 May 2024, Version 1
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

The prenyl group is present in numerous biologically active small molecule drugs and natural products. We introduce benzylic C-H alkenylation of substrates Ar-CH3 with alkenylboronic esters (CH2)3O2B-CH=CMe2 as a pathway to form prenyl functionalized arenes Ar-CH2CH=CMe2. Mechanistic studies of this radical relay catalytic protocol reveal diverse reactivity pathways exhibited by the copper(II) vinyl intermediate [CuII]-CH=CMe2 that involve radical capture, bimolecular C-C bond formation, and hydrogen atom transfer (HAT).

Keywords

C-H functionalization
copper
prenylation
C-H alkenylation

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