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...
Intramolecular Polar [4<sup>⊕</sup>+2] Cycloadditions of Aryl-1-aza-2-azoniaallene Salts: Unprecedented Reactivity Leading to Polycyclic Protonated Azomethine Imines
作者:Daniel A. Bercovici、Jodi M. Ogilvie、Nikolay Tsvetkov、Matthias Brewer
DOI:10.1002/anie.201306553
日期:2013.12.9
Charged up: In the first example of the title salts undergoing a [4⊕+2] cycloaddition reaction, the azo bond and one aromatic π bond make up the 4π component. This reaction appears to be concerted and provides high yields of protonatedazomethineimine products. Substituted alkenes provided products containing all‐carbon or nitrogen‐bearing quaternary centers in high yield.