[(NHC)AuI]-Catalyzed Formation of Conjugated Enones and Enals: An Experimental and Computational Study
作者:Nicolas Marion、Peter Carlqvist、Ronan Gealageas、Pierre de Frémont、Feliu Maseras、Steven P. Nolan
DOI:10.1002/chem.200700134
日期:2007.7.27
or absence of water in the reaction mixture was found to be crucial. From the same phenylpropargyl acetates, anhydrous conditions led to the formation of indene compounds via a tandem [3,3] sigmatropic rearrangement/intramolecular hydroarylation process, whereas simply adding water to the reaction mixture produced enone derivatives cleanly. Several mechanistic hypotheses, including the hydrolysis of
Gold- and Silver-Catalyzed Reactions of Propargylic Alcohols in the Presence of Protic Additives
作者:Matthew N. Pennell、Peter G. Turner、Tom D. Sheppard
DOI:10.1002/chem.201102830
日期:2012.4.10
secondary and tertiary propargylicalcohols undergo a Meyer–Schusterrearrangement to give enones at room temperature in the presence of a gold(I) catalyst and small quantities of MeOH or 4‐methoxyphenylboronic acid. The syntheses of the enone natural products isoegomaketone and daphenone were achieved using this reaction as the key step. The rearrangement of primary propargylicalcohols can readily be combined
A General Procedure for the Synthesis of Enones via Gold-Catalyzed Meyer−Schuster Rearrangement of Propargylic Alcohols at Room Temperature
作者:Matthew N. Pennell、Matthew G. Unthank、Peter Turner、Tom D. Sheppard
DOI:10.1021/jo102263t
日期:2011.3.4
Meyer−Schuster rearrangements of propargylic alcohols take place readily at room temperature in toluene with 1−2 mol % PPh3AuNTf2, in the presence of 0.2 equiv of 4-methoxyphenylboronic acid or 1 equiv of methanol. Good to excellent yields of enones can be obtained fromsecondary and tertiary alcohols, with high selectivity for the E-alkene in most cases. A one-pot procedure for the conversion of primary
Triazole-Gold-Promoted, Effective Synthesis of Enones from Propargylic Esters and Alcohols: A Catalyst Offering Chemoselectivity, Acidity and Ligand Economy
作者:Dawei Wang、Yanwei Zhang、Alexandria Harris、Lekh Nath S. Gautam、Yunfeng Chen、Xiaodong Shi
DOI:10.1002/adsc.201100314
日期:2011.10
(TA-Au) were revealed as the effectivecatalysts in promoting propargylicester rearrangement and sequential allene hydration, giving the enones with excellent yields (up to 97% yields, 0.2% loading). The catalysts could also catalyze the more challenging Meyer–Schuster rearrangement (0.5% loading, up to 98% yields). The reported reaction confirmed TA-Au as a chemoselectivecatalyst in promoting alkyne activation
Triazole acetyl gold(III) catalyzed Meyer–Schuster rearrangement of propargyl alcohols
作者:Yongchun Yang、Yanan Shen、Xiaoli Wang、Yao Zhang、Dawei Wang、Xiaodong Shi
DOI:10.1016/j.tetlet.2016.04.043
日期:2016.5
A new type triazole acetyl gold(III) was prepared and found to be an effective catalyst in Meyer–Schusterrearrangement of propargyl alcohols. The reactions proceeded well under much milder conditions to afford enones bearing a wide range of functional groups, thereby opening a new avenue for gold(III) catalysis. In addition, TriaAuCl2 catalyst was also effective on promotion of a-haloenones synthesis