transfer (PCET). Mechanistic experiments and DFT calculations support the possibility of a concerted protonelectron-transfer (CPET) pathway. This Birch-type reduction demonstrates that a small nucleophilic organic molecule can be used as a single electron-transfer (SET) reducing agent with a proper proton source.
Selective Catalytic Synthesis of α-Alkylated Ketones and β-Disubstituted Ketones via Acceptorless Dehydrogenative Cross-Coupling of Alcohols
作者:Dipanjan Bhattacharyya、Bikash Kumar Sarmah、Sekhar Nandi、Hemant Kumar Srivastava、Animesh Das
DOI:10.1021/acs.orglett.0c04098
日期:2021.2.5
phosphine-free pincer ruthenium(III) catalyzed β-alkylation of secondaryalcohols with primary alcohols to α-alkylated ketones and two different secondaryalcohols to β-branched ketones are reported. Notably, this transformation is environmentally benign and atom efficient with H2O and H2 gas as the only byproducts. The protocol is extended to gram-scale reaction and for functionalization of complex vitamin E
Rapid and Regioselective Hydrogenation of α,β-Unsaturated Ketones and Alkylidene Malonic Diesters Using Hantzsch Ester Catalyzed by Titanium Tetrachloride
作者:Yulin Lam、Jun Che
DOI:10.1055/s-0030-1258556
日期:2010.10
A regioselective hydrogenation of α,β-unsaturated ketones and alkylidenemalonic diesters using Hantzsch ester as the reducing agent and titanium tetrachloride as a catalyst is described. The short reaction times and mild reaction conditions are the advantages of this method.
Electrophilic chemistry of propargylic alcohols in imidazolium ionic liquids: Propargylation of arenes and synthesis of propargylic ethers catalyzed by metallic triflates [Bi(OTf)3, Sc(OTf)3, Yb(OTf)3], TfOH, or B(C6F5)3
作者:Gopalakrishnan Aridoss、Viorel D. Sarca、James F. Ponder Jr、Jessica Crowe、Kenneth K. Laali
DOI:10.1039/c0ob00872a
日期:——
formed. Steric influence of the propargylic moiety on substrate selectivity is reflected in the lack of ortho propargylation for phenol and ethylbenzene by using propargylic alcohol Ia, and notable formation of the ortho isomer employing alcohol Ib. In the later case paraselectivity could be increased by running the reaction at r. t. for 10 h. The Bi(OTf)3-catalyzed reaction of 1,3-dimethoxybenzene with
Iridium Complexes as Efficient Catalysts for Construction of
<i>α</i>
‐Substituted Ketones via Hydrogen Borrowing of Alcohols in Water
作者:Nianhua Luo、Yuhong Zhong、Huiling Wen、Hongling Shui、Renshi Luo
DOI:10.1002/ejoc.202001550
日期:2021.3.5
cross‐coupling of alcohols via hydrogen borrowing is reported, affording a series of α‐alkylated ketones in high yield and chemoselectivities. Moreover, this methodology has the advantages of low catalyst loading and environmentally benign water as the solvent. In addition, a gram‐scale experiment demonstrates the potential application in the practical synthesis of α‐alkylated ketones.