Redox-Triggered Ruthenium-Catalyzed Remote C–H Acylation with Primary Alcohols
作者:Xiao Guo、Yang Wu、Gongqiang Li、Ji-Bao Xia
DOI:10.1021/acscatal.0c03343
日期:2020.11.6
related compounds. Prior examples for hydrogenative remote C(sp3)–H functionalization of olefins via a metal walking process featured external reducing agents. Here, we report a strategy for redox-triggered hydrogenative remote C(sp3)–H acylation of olefins with primary alcohols both as an acylating agent and a reductant, which is validated by the base-free 1,3-diketone synthesis. Mechanistic studies have
From selective transfer hydrogenation to selective hydrogen auto-transfer process: An efficient method for the synthesis of alkenyl ketones via iridium-catalyzed α-alkylation of ketones with alkenyl alcohols
作者:Xiangchao Xu、Chenchen Yang、Shun Li、Chong Meng、Junjie Yu、Jiazhi Yang、Feng Li
DOI:10.1016/j.jcat.2021.08.038
日期:2021.10
in the ligand are crucial for the activity of catalyst and selective transfer hydrogenation is the determining step of the formation of alkenyl ketones as products. Notably, the present research exhibited also the unique potential of metal–ligand bifunctional catalysts for the activation of unsaturated alcohols as electrophiles for hydrogen auto-transfer process.
Manganese-Catalyzed α-Alkylation of Ketones, Esters, and Amides Using Alcohols
作者:Subrata Chakraborty、Prosenjit Daw、Yehoshoa Ben David、David Milstein
DOI:10.1021/acscatal.8b03720
日期:2018.11.2
bond-forming reactions via α-alkylation of ketones, amides, and esters, using primary alcohols. β-Alkylation of secondary alcohols by primary alcohols to obtain α-alkylated ketones is also reported. The reactions are catalyzed by a ( i Pr-PNP)Mn(H)(CO)2 pincer complex under mild conditions in the presence of (catalytic) base liberating water (and H2 in the case of secondary alcohol alkylation) as the sole
intramolecular γ-hydrogen abstraction of the triplet ketone (type IIphotoreaction) occurred to give acetophenone and 1-phenylalk-n-en-1-one (PhC(O)–(CH2)n − 3–CHCH2), respectively, in a 1∶1 product ratio. Type IIphotoreaction occurred in all the 1,ω-diphenylalkane-1,ω-diones. The product 1-phenylalk-n-en-1-one also underwent a photoreaction to give secondary products under prolonged photoirradiation.
alkylaminyl radical formation and maintain the nucleophilicity of fluoride ion. This protocol exhibits excellent functional-group tolerance toward various aryl and unactivated alkenes, furnishing the corresponding β-fluoroamines with high regioselectivity. Mechanistic investigation reveals an aziridinium intermediate via a radical pathway. The syntheticutility of this transformation was demonstrated by