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.
Gold(I)-Catalyzed Rearrangement of Propargyl Benzyl Ethers: A Practical Method for the Generation and in Situ Transformation of Substituted Allenes
作者:Benoit Bolte、Yann Odabachian、Fabien Gagosz
DOI:10.1021/ja1020469
日期:2010.6.2
of benzyl propargyl ethers react with a gold(I) catalyst to furnish variously substituted allenes via a 1,5-hydride shift/fragmentation sequence. This transformation is rapid and practical. It can be performed under very mild conditions (room temperature or 60 degrees C) using terminal as well as substituted alkyne substrates bearing a primary, secondary, or tertiary benzyl ether group. The allenes
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
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.