InCl<sub>3</sub>/Me<sub>3</sub>SiBr-Catalyzed Direct Coupling between Silyl Ethers and Enol Acetates
作者:Yoshiharu Onishi、Yoshihiro Nishimoto、Makoto Yasuda、Akio Baba
DOI:10.1021/ol200875m
日期:2011.5.20
A combined Lewis acid catalyst of InCl3 and Me3SiBr promoted the direct use of enol acetates in the coupling with low-reactive silyl ethers, in which functional groups including ketones and aldehydes survived. Sterically hindered silyl ethers such as ROSiEt3, ROSiPh3, ROSit-BuMe2, and ROSii-Pr3 were also applicable.
Rhenium complex-catalyzed coupling reaction of enol acetates with alcohols
作者:Rui Umeda、Yuuki Takahashi、Yutaka Nishiyama
DOI:10.1016/j.tetlet.2014.09.054
日期:2014.10
The reaction of enolacetates with alcohols in the presence of a catalytic amount of a rhenium complex, such as ReBr(CO)5, produced the corresponding ketones and aldehydes in moderate to good yields. It was suggested that the preparation of an ether, an intermolecular dehydrated product, was the first step of the reaction.
When benzylic and allylic alcohols were treated with enolacetate in the presence of a catalytic amount of a rhenium complex, ReBr(CO)5, the carbon-carbon bond formation of the alcohols and enolacetate smoothly proceeded to give the corresponding ketones and aldehyde in moderate to good yields. For the reaction of allylic alcohols, γ,δ-unsaturated carbonylcompounds were obtained in good yields. When
InI<sub>3</sub>/Me<sub>3</sub>SiI-catalyzed Direct Alkylation of Enol Acetates Using Alkyl Acetates or Alkyl Ethers
作者:Yoshiharu Onishi、Yoshihiro Nishimoto、Makoto Yasuda、Akio Baba
DOI:10.1246/cl.2011.1223
日期:2011.11.5
A combined Lewis acid of InI3 and Me3SiI was used to catalyze the direct coupling reactions of enolacetates with alkyl acetates or alkyl ethers without generating metal waste. The easily-handled a...
The asymmetriccopper-catalyzedconjugateaddition to α-alkylidene cycloalkanones, substituted at their terminal position with aromatic and aliphatic groups, is reported. While high enantioselectivity is reached using chiral phosphoramidite ligands, with R3Al reagents, moderate diastereoselectivity was observed upon hydrolysis of the aluminium enolates. A Grignard reagent also react with high diastereoselectivity