Formal [3 + 2] Reaction of α,α-Diaryl Allylic Alcohols with <i>sec</i>-Alcohols: Proceeding with Sequential Radical Addition/Migration toward 2,3-Dihydrofurans Bearing Quaternary Carbon Centers
作者:Weiming Hu、Song Sun、Jiang Cheng
DOI:10.1021/acs.joc.6b00643
日期:2016.5.20
3-dihydrofurans in moderate to excellent yields with good functional group tolerance. This procedure involves sequential radical addition, 1,2-arylmigration, and a dehydration process, where the migration of aryl with lower electron density is favored. Notably, cyclic reactions with sec-alcohols also ran smoothly, providing a novel method to access oxaspiro compounds.
Eosin Y-catalyzed, visible-light-promoted carbophosphinylation of allylic alcohols <i>via</i> a radical neophyl rearrangement
作者:Yao Yin、Wei-Zhi Weng、Jian-Guo Sun、Bo Zhang
DOI:10.1039/c8ob00231b
日期:——
phosphinylation of allylic alcohols with concomitant 1,2-aryl migration is described. This transformation proceeds smoothly under metal-free and mild conditions by using an inexpensive organic dye, eosin Y, as the photocatalyst, affording various β-aryl-γ-ketophosphine oxides in moderate to good yields. Mechanistic studies suggested that the 1,2-aryl migration proceeded through a radical (neophyl) rearrangement
Metal-Free Oxidative Radical Addition of Carbonyl Compounds to α,α-Diaryl Allylic Alcohols: Synthesis of Highly Functionalized Ketones
作者:Xue-Qiang Chu、Hua Meng、You Zi、Xiao-Ping Xu、Shun-Jun Ji
DOI:10.1002/chem.201404463
日期:2014.12.15
A metal‐free directalkylation of simple carbonyl compounds (ketones, esters, and amides) with α,α‐diaryl allylic alcohols is described. The protocol provides facile access to highly functionalized dicarbonyl ketones by a radical addition/1,2‐aryl migration cascade. The regioselectivity of the reaction was precisely controlled by the nature of the carbonyl compound.
Metal-free oxidative direct C(sp<sup>3</sup>)–H bond functionalization of ethers with α,α-diaryl allylic alcohols
作者:Xue-Qiang Chu、Hua Meng、You Zi、Xiao-Ping Xu、Shun-Jun Ji
DOI:10.1039/c4cc04282d
日期:——
A metal-free method for direct C(sp(3))-H bondfunctionalization of simple ethers with alpha,alpha-diaryl allylic alcohols is described. The established protocol provides facile access to alpha-aryl-beta-oxyalkylated carbonyl ketones via radical addition and a 1,2-aryl migration cascade process. An application of the product has been demonstrated in the synthesis of a serotonin antagonist.
Radical 1,2-aryl migration in α,α-diaryl allylic alcohols toward β-silyl ketones
作者:Haibo Peng、Jin-Tao Yu、Yan Jiang、Jiang Cheng
DOI:10.1039/c5ob01855b
日期:——
A copper-catalyzed radical 1,2-aryl migration in α,α-diaryl allylic alcohols is developed, leading to β-silyl carbonyl compounds in moderate to good yields. The migration of aryls with lower aromaticity is favored. This procedure features the employment of silanes as commercially available materials.