FeCl<sub>3</sub>-Catalyzed Coupling of Propargylic Acetates with Alcohols
作者:Zhuang-Ping Zhan、Hui-Juan Liu
DOI:10.1055/s-2006-949645
日期:2006.9
A new method for the synthesis of propargylic ethers by FeCl3-catalyzed alcoholysis of propargylic acetates was developed. The reaction was carried out at room temperature in acetonitrile without exclusion of moisture or air. High product yields were obtained with excellent reaction regioselectivity.
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
Rhenium-catalyzed Coupling of 2-Propynyl Alcohols and Several Nucleophiles via Dehydration
作者:Yoichiro Kuninobu、Hirokazu Ueda、Kazuhiko Takai
DOI:10.1246/cl.2008.878
日期:2008.8.5
Treatment of 2-propynyl alcohols with several nucleophiles in the presence of a catalytic amount of a rhenium complex, [ReBr(CO)3(thf)]2, gave coupling products via dehydration. In these reactions, C–C, C–O, and C–S bonds can be constructed under mild conditions.
Efficient and direct substitution of propargylic alcohol with a variety of oxygen, nitrogen, and carbon nucleophiles catalyzed by MoO2(acac)2/NH4PF6 system was developed. The functional alkynes were obtained in modest to good yields with this versatile and practical protocol.