Remarkable contrast between chemospecificities in acid-mediated arylation of δ- and γ-ketocarboxylic acids was revealed: in the presence of P2O5–MsOH, TfOH, PPA, and MsOH, arylation of δ-ketocarboxylic acid 1A with arenes takes place at the carboxycarbonyl carbon, while that of γ-ketocarboxylic acid 1B takes place at the ketone carbonyl carbon, specifically.
1-(2-Iodophenyl)-1H-tetrazole as a ligand for Pd(II) catalyzed Heck reaction
作者:Arun Kumar Gupta、Chung Hyun Song、Chang Ho Oh
DOI:10.1016/j.tetlet.2004.03.162
日期:2004.5
1-(2-Iodophenyl)-1H-tetrazole 2 was synthesized by the reaction of 2-iodoaniline, sodium azide and triethyl orthoformate in acetic acid. The newly synthesized ligand 2 was successfully used in Heckreaction to give the cross-coupled products in excellent yields.
An Electrophilic Trifluoromethylthiolation of Silylenol Ethers and <i>β</i>
-Naphthols with Diethylaminosulfur Trifluoride and (Trifluoromethyl)trimethylsilane
作者:Perumal Saravanan、Pazhamalai Anbarasan
DOI:10.1002/adsc.201800366
日期:2018.8.6
efficient and general trifluoromethylthiolation of silylenol ethers and β‐naphthols have been accomplished employing the combination of diethylaminosulfur trifluoride (DAST) and (trifluoromethyl)trimethylsilane (CF3TMS) as source of electrophilic trifluoromethylthio moiety for the synthesis of α‐trifluoromethylthiolated carbonyl compounds and β‐naphthols in good yields. Important features of this method
Pt-Catalyzed Oxidative Rearrangement of Cyclic Tertiary Allylic Alcohols to Enones Using Aqueous Hydrogen Peroxide
作者:Takashi Nagamine、Yoshihiro Kon、Kazuhiko Sato
DOI:10.1246/cl.2012.744
日期:2012.7.5
An oxidative rearrangement of cyclic tertiary allylic alcohols to β-disubstituted α,β-unsaturated ketones by Pt black catalyst with aqueous hydrogen peroxide is described. The reaction proceeds under organic solvent- and halide-free conditions and gives only water as a coproduct. The Pt black catalyst is commercially available and can be reused at least four times.
Palladium-Catalyzed Oxidative Rearrangement of Tertiary Allylic Alcohols to Enones with Oxygen in Aqueous Solvent
作者:Jingjie Li、Ceheng Tan、Jianxian Gong、Zhen Yang
DOI:10.1021/ol502578h
日期:2014.10.17
A one-pot procedure for Pd(TFA)2-catalyzed 1,3-isomerization of tertiary allylic alcohols to secondary allylic alcohols followed by a Pd(TFA)2/neocuproine-catalyzed oxidative reaction to β-disubstituted-α,β-unsaturated kenones was developed.