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.
DOI:——
日期:——
Sulfonium ion-promoted traceless Schmidt reaction of alkyl azides
Schmidt reaction by sulfonium ions is described. General primary, secondary, and tertiary alkyl azides were converted to the corresponding carbonyl or imine compounds without any trace of the activators. This bond scission reaction through 1,2-migration of C–H and C–C bonds was accessible to the one-pot substitution reaction.