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Synthesis 2008(21): 3533-3536  
DOI: 10.1055/s-0028-1083191
PSP
© Georg Thieme Verlag Stuttgart ˙ New York

Direct Reduction of Esters to Ethers with an Indium(III) Bromide/Triethylsilane Catalytic System

Norio Sakai*, Toshimitsu Moriya, Kohji Fujii, Takeo Konakahara
Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science (RIKADAI), Noda, Chiba 278-8510, Japan
e-Mail: sakachem@rs.noda.tus.ac.jp;
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Publikationsverlauf

Received 27 June 2008
Publikationsdatum:
16. Oktober 2008 (online)

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Abstract

An indium(III) bromide-triethylsilane reagent system promotes direct reduction of esters to produce the corresponding unsymmetrical ethers. This simple catalytic system accommodated other carbonyl compounds, such as a tertiary amide and a carboxylic acid.

Key words

reduction - indium(III) bromide - silane - ether

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9

When the reaction was carried out using 2 and 3 equiv of Et3SiH, the product 2a was obtained in 67% and 91% yields, respectively. Using more than 3 equiv of Et3SiH led to complete reduction.