Synlett 2011(4): 551-554  
DOI: 10.1055/s-0030-1259515
LETTER
© Georg Thieme Verlag Stuttgart ˙ New York

Rasta Resin-PPh3BnCl and its Use in Chromatography-Free Carbonyl Cyanosilylation Reactions

Yan Teng, Patrick H. Toy*
Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. of China
Fax: +85228571586; e-Mail: phtoy@hku.hk;
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Publikationsverlauf

Received 29 October 2010
Publikationsdatum:
27. Januar 2011 (online)

Abstract

Rasta resin-PPh3BnCl, a new heterogeneous polystyrene-based phosphonium salt, has been synthesized and used to catalyze cyanosilylation reactions of aldehydes and ketones. It was found to be more efficient as a catalyst than a similar heterogeneous phosphonium salt anchored onto a polystyrene-based on the Merrifield resin architecture of 2% divinylbenzene cross-linking. In these reactions rasta resin-PPh3BnCl was separated from the desired reaction product simply by filtration, and it could be reused without significant loss of catalytic activity numerous times.

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See Supporting Information for details.

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General Procedure for Cyanosilylation Reactions To a solution of the aldehyde or ketone substrate (0.5 mmol) and TMSCN (0.75 mmol) in CHCl3 was added 2 or 3 (0.025 mmol). The reaction mixture was stirred at 50 ˚C until TLC analysis indicated that the starting material was completely consumed. The reaction mixture was then filtered and the polymer-supported catalyst was washed with CH2Cl2 (2 × 50 mL). The combined filtrate was concentrated in vacuo to afford the desired product. All products were characterized by MS, ¹H NMR, and ¹³C NMR spectroscopy.