Palladium-Catalyzed Oxidative Rearrangement of Diaryl Alkenyl Carbinols to β,β-Diaryl α,β-Unsaturated Ketones
作者:David Rosa、Arturo Orellana
DOI:10.1021/ol201177t
日期:2011.7.15
An unusual oxidative palladium-catalyzed rearrangement of diaryl alkenyl carbinols to β,β-diaryl α,β-unsaturated ketones is described. The geometry of the alkene product is not determined by the electronic nature of the aryl substitutents but rather is determined by substitution pattern on the aryl rings. The reaction proceeds in good yields, utilizes oxygen at atmospheric pressure as the terminal
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.
Halogen Cation Induced StereoselectiveSemipinacol-type Rearrangement of Allylic Alcohols: A Highly EfficientApproach to α-Quaternary β-Haloketo Compounds
作者:Yong Qiang Tu、Bao Min Wang、Zhen Lei Song、Chun An Fan、Wei Ming Chen
DOI:10.1055/s-2003-40855
日期:——
Allylic alcohols were found to undergo a semipinacol-type rearrangement induced by halogen cation generated from the chloramine-T/ZnX 2 combination, which provided a highly efficient and stereoselective method for the preparation of α-quatemary β-haloketo compounds. This reaction is valuable and versatile since a quaternary carbon could be constructed effectively and three kinds of β-haloketo compounds
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.