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Synlett 2004(6): 1077-1079
DOI: 10.1055/s-2004-820045
DOI: 10.1055/s-2004-820045
LETTER
© Georg Thieme Verlag Stuttgart · New York
Cyanosilylation of Ketones Catalyzed by Quaternary Ammonium Salt and N-Oxide
Further Information
Received
14 February 2004
Publication Date:
25 March 2004 (online)
Publication History
Publication Date:
25 March 2004 (online)
Abstract
Dibenzyldimethyl ammonium bromide and triethanolamine N-oxide catalyze the formation of cyanohydrin trimethylsilyl ethers of ketones in 80-99% yield.
Key words
cyanohydrins - ketones - N-oxides - quaternary ammonium salts - organocatalysis
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References
Typical Procedure: To a mixture of ketone (1.1 mmol), dibenzyldimethyl ammonium bromide (0.027 mmol) and triethanolamine N-oxide (0.027 mmol) in CH2Cl2 (0.5 mL) was added trimethylsilyl cyanide (2.2 mmol, 2 equiv.) at r.t. The reaction was monitored by TLC, and after the reaction period described in Table [4] , the reaction mixture was concentrated under reduced pressure and purified by silica gel column to give the pure product with Et2O-petroleum ether (1:100) as the eluent.