Anti-Markovnikov Hydroazidation of Activated Olefins via Organic Photoredox Catalysis
作者:Nicholas P. R. Onuska、Megan E. Schutzbach-Horton、José L. Rosario Collazo、David. A. Nicewicz
DOI:10.1055/s-0039-1690691
日期:2020.1
bioactive and medicinally relevant molecules. Historically, the formal hydroazidation of simple activatedolefins and styrenes has proven difficult due to the inherent propensity of these compounds to oligomerize. Herein is disclosed a method for the anti-Markovnikov hydroazidation of activatedolefins, catalyzed by an organic acridinium salt under irradiation from blue LEDs. This method is applicable
A Mn(<scp>iii</scp>)/TEMPO-co-mediated tandem azidation–1,2-carbon migration reaction of allylic silyl ethers
作者:Zhi-Min Chen、Zhen Zhang、Yong-Qiang Tu、Ming-Hui Xu、Fu-Min Zhang、Chen-Chen Li、Shao-Hua Wang
DOI:10.1039/c4cc04707a
日期:——
A novel Mn(III)/TEMPO-co-mediated tandem azidation-1,2-carbon migration reaction of allylic silylethers with an unactivated C=C bond has been explored, generating alpha-aryl-alkyl beta-azido ketones with an alpha-quaternary stereocenter.
Organocatalytic Asymmetric Fluorination/Semipinacol Rearrangement: An Efficient Approach to Chiral β-Fluoroketones
作者:Zhi-Min Chen、Bin-Miao Yang、Zhi-Hua Chen、Qing-Wei Zhang、Min Wang、Yong-Qiang Tu
DOI:10.1002/chem.201202444
日期:2012.10.8
An asymmetricfluorination/semipinacol rearrangement of 2‐oxa allylic alcohols, as catalyzed by cinchona‐alkaloid derivatives, gives chiral β‐fluoro ketones with moderate to high levels of enantioselectivity (see scheme). Both enantiomers of the product could be obtained by using the appropriate catalyst.
A novel copper‐catalyzed tandem trifluoromethylation/semipinacol rearrangement reaction of allylic alcohols has been achieved under mild conditions. This reaction is valuable for the difunctionalization of alkenes through simultaneous construction of a CCF3 bond and a quaternary carbon center, and could provide a straightforward strategy for the preparation of α‐quaternary β‐trifluoromethyl ketone
Radical phosphinylation of α,α-diaryl allylic alcohols with concomitant 1,2-aryl migration
作者:Xue-Qiang Chu、You Zi、Hua Meng、Xiao-Ping Xu、Shun-Jun Ji
DOI:10.1039/c4cc02114b
日期:——
A novel radical phosphinylation of alpha,alpha-diaryl allylic alcohols with arylphosphine oxides was described for the direct preparation of alpha-aryl-beta-phosphinylated carbonyl ketones in medium to good yields via 1,2-aryl migration. In this reaction, formation of new C(Ar)-C(sp(3)) and C(sp(3))-P bonds was observed.