Radical 1,2-Alkylarylation/Acylarylation of Allylic Alcohols with Aldehydes via Neophyl Rearrangement
作者:Changduo Pan、Qingting Ni、Yu Fu、Jin-Tao Yu
DOI:10.1021/acs.joc.7b01255
日期:2017.7.21
A metal-free 1,2-alkylarylation of allylicalcohols with aliphatic aldehydes through concomitant radical neophyl rearrangement was developed, providing 1,2-diphenyl-3-alkyl propanones in moderate to good yields. Moreover, when cyclopropanecarbaldehyde and aryl carbaldehydes were concerned, acylarylation was involved leading to 1,4-dicarbonyl compounds.
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.
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.
Fe(<scp>iii</scp>)-mediated isomerization of α,α-diarylallylic alcohols to ketones via radical 1,2-aryl migration
作者:Ziyang Deng、Changwei Chen、Sunliang Cui
DOI:10.1039/c6ra20007a
日期:——
An Fe(III)-mediated radical 1,2-aryl migration of α,α-diarylallylic alcohols for the isomerization to ketones is described. The Fe(acac)3–silane would convert the alkene to an alkyl radical and initiates a 1,2-aryl migration-oxidation process. Thus Fe(acac)3 serves as an olefin hydrogen atom transfer initiator and oxidant, while various allylic alcohols could isomerize to ketones in moderate to good