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Synlett 2008(7): 1081-1085
DOI: 10.1055/s-2008-1072655
DOI: 10.1055/s-2008-1072655
LETTER
© Georg Thieme Verlag Stuttgart · New York
New Cationic Bisoxazoline-Au(III) Complex Catalyzed Cycloisomerization of 1-Allenyl-1-ethynyl Acetate
Further Information
Received
17 January 2008
Publication Date:
28 March 2008 (online)
Publication History
Publication Date:
28 March 2008 (online)
Abstract
Treatment of 1-allenyl-1-diethynyl acetates in the presence of a Au or Pt catalyst (5 mol%) in toluene at room temperature, followed by methanolysis, gave 4-methylene-2-cyclopentenones. The new cationic bisoxazoline (box)-Au(III) complex {(S,S)-Phbox- or [(R,R)-Bnbox AuCl2]SbF6} accelerated the reaction, providing the products in moderate yield (60-69%).
Key words
1-allenyl-1-diethynyl acetates - 4-alkylidene-2-cyclopentenones - cationic box-Au(III) complex
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