Herein an operationally simple alkylation of methylene ketones with primary alcohols is reported. Use of an inexpensive and earth abundant Mn/1,10-phenanthroline system enables direct access to a series of functionalised branchedketones including one-pot sequential double alkylation and Alzheimer's drug donepezil. Preliminary mechanistic investigation, determination of the rate and order of reactions
demonstrate a general and broadly applicable catalytic cross coupling of methylene ketones and secondary alcohols with a series of primaryalcohols to disubstituted branched ketones. A simple and nonprecious Fe2(CO)9 catalyst enables one-pot oxidations of both primary and secondary alcohols to a range of branched gem-bis(alkyl) ketones. A number of bond activations and formations selectively occurred in
A transition-metal-free and base promoted C–C bond forming reaction of benzyl C(sp3)–H bond with organoammonium salts via C–N bondcleavage has been reported. Benzyl ammonium salts as well as cinnamyl ammonium salt could couple readily with various benzyl C(sp3)–H species, producing the corresponding products in moderate to excellent yields with good functional group tolerance. Late stage chemical
Four‐Component Borocarbonylation of Vinylarenes Enabled by Cooperative Cu/Pd Catalysis: Access to β‐Boryl Ketones and β‐Boryl Vinyl Esters
作者:Yang Yuan、Fu‐Peng Wu、Jian‐Xing Xu、Xiao‐Feng Wu
DOI:10.1002/anie.202006427
日期:2020.9.21
general four‐component synthetic procedure for the preparation of β‐boryl ketones and β‐boryl vinyl esters. Joint catalyzed by palladium and copper catalysts, borocarbonylative reaction between vinylarenes, aryl halides/triflates, B2Pin2, and carbon monoxide proceed successfully. A variety of synthetically useful β‐boryl ketones were synthesized in good to high yields by using aryl iodides as the substrates
NNN Pincer Ru(II)-Complex-Catalyzed α-Alkylation of Ketones with Alcohols
作者:Xiao-Niu Cao、Xiao-Min Wan、Fa-Liu Yang、Ke Li、Xin-Qi Hao、Tian Shao、Xinju Zhu、Mao-Ping Song
DOI:10.1021/acs.joc.8b00013
日期:2018.4.6
C–C bonds using alcohols as the alkylating agents, generating water as the only byproduct. A broad range of substrates, including (hetero)aryl- or alkyl-ketones and alcohols, were well tolerated under the optimized conditions. Notably, α-substituted methylene ketones were also investigated, which afforded α-branched steric hindrance products. A potential application of α-alkylation of methylene acetone