Activation of Mononuclear Arene Ruthenium Complexes for Catalytic Propargylation Directly with Propargyl Alcohols
作者:Emilio Bustelo、Pierre H. Dixneuf
DOI:10.1002/adsc.200600512
日期:2007.4.2
ligand. The in situ generated catalyst has been applied to catalytic transformations of alkynes and propargylic alcohols: propargylation of furans, propargyl ether synthesis from internal and terminal propargylic alcohols with propargyl, homopropargyl and allyl alcohols, selective dimerization of phenylacetylene into E-enyne, and propargyl alcohol rearrangement into α,β-unsaturated aldehydes and ketones
[(对伞花基)RuX(CO)(PR 3)] [OTf](R = Ph,Cy; X = Cl,OTf)类型的单核络合物促进呋喃与炔丙醇的直接催化炔丙基化。这些前体是通过活化炔丙醇从[(对-cymene)RuCl(OTf)(PR 3)]原位产生的,导致经由亚烯基和烯基-羟基卡宾中间体形成羰基配体。催化活性物质的产生需要短的初始热活化以诱导对-异丙基配体的去配位。在原位生成的催化剂已用于炔烃和炔丙醇的催化转化:呋喃的炔丙基化,内部和末端炔丙醇与炔丙基,高炔丙基和烯丙基醇的炔丙基醚合成,苯乙炔的选择性二聚为E-烯炔和炔丙醇重排为α ,β-不饱和醛和酮通过Meyer-Schuster重排。含有内部CC键的炔丙醇的炔丙基化表明通过Nicholas型中间体(金属稳定的炔丙基阳离子)的活化。
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.
Gold-catalyzed nucleophilicsubstitution on propargylicalcohols, with various C-, O-, and S-nucleophiles, is described under very mild conditions (room temperature, dichloromethane) in 0-97% yield.
作者:Joshua J. Kennedy-Smith、Lauren A. Young、F. Dean Toste
DOI:10.1021/ol049649p
日期:2004.4.1
A mild aromaticpropargylation reaction, employing an air- and moisture-tolerant rhenium-oxo complex ((dppm)ReOCl(3)) as a catalyst and a propargyl alcohol as the electrophile, is described. The reaction tolerates a broad range of functional groups and regioselectively affords propargylic arenas without formation of the isomeric allenyl adducts. The potential of this rhenium(V)-catalyzed reaction is