A General Strategy for Aliphatic C–H Functionalization Enabled by Organic Photoredox Catalysis
作者:Kaila A. Margrey、William L. Czaplyski、David A. Nicewicz、Erik J. Alexanian
DOI:10.1021/jacs.8b00592
日期:2018.3.28
Synthetic transformations that functionalize unactivated aliphatic C-H bonds in an intermolecular fashion offer unique strategies for the synthesis and late stage derivatization of complex molecules. Herein we report a general approach to the intermolecular functionalization of aliphatic C-H bonds using an acridinium photoredox catalyst and phosphate salt under blue LED irradiation. This strategy encompasses a range of valuable C-H transformations, including the direct conversions of a C-H bond to C-N, C-F, C-Br, C-Cl, C-S, and C-C bonds, in all cases using the alkane substrate as the limiting reagent. Detailed mechanistic studies are consistent with the intermediacy of a putative oxygen-centered radical as the hydrogen atom-abstracting species in these processes.
Iron(III)/NaBH<sub>4</sub>-Mediated Additions to Unactivated Alkenes: Synthesis of Novel 20′-Vinblastine Analogues
作者:Erick K. Leggans、Timothy J. Barker、Katharine K. Duncan、Dale L. Boger
DOI:10.1021/ol300173v
日期:2012.3.16
An Fe(III)/NaBH4-mediated reaction for the functionalization of unactivated alkenes is described defining the alkene substrate scope, establishing the exclusive Markovnikov addition, exploring a range of free radical traps, examining the Fe(III) salt and initiating hydride source, introducing H2O-cosolvent mixtures, and exploring catalytic variants. Its use led to the preparation of a novel, potent, and previously inaccessible C20'-vinblastine analogue.
Ishikawa, Hayato; Colby, David A.; Seto, Shigeki, Journal of the American Chemical Society, 2009, vol. 131, p. 4904 - 4916
作者:Ishikawa, Hayato、Colby, David A.、Seto, Shigeki、Va, Porino、Tam, Annie、et al.