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Synthesis 2001(6): 0855-0862
DOI: 10.1055/s-2001-13404
DOI: 10.1055/s-2001-13404
PAPER
© Georg Thieme Verlag Stuttgart · New York
Synthesis of Arylspiroketals Related to the Papulacandins via Generation of Phthalide Oxycarbenium Ions
Further Information
Received
20 November 2000
Publication Date:
24 September 2004 (online)
Publication History
Publication Date:
24 September 2004 (online)
Abstract
The nucleophilic addition of allylstannanes to oxycarbenium ions generated from phthalide acetate has been studied. The optimum conditions involve the use of trimethylsilyl trifluoromethanesulfonate in dichloromethane at -78 °C. Hydroboration of the allylated products followed by oxidative cyclization provides an efficient synthesis of arylspiroketals which are closely related to the papulacandins.
Key words
phthalides - oxycarbenium ions - papulacandins - spiroketals - allylstannanes
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