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Synthesis 2007(14): 2115-2120
DOI: 10.1055/s-2007-983749
DOI: 10.1055/s-2007-983749
PAPER
© Georg Thieme Verlag Stuttgart · New York
Efficient Synthesis of Substituted Tetrahydrothiopyrano[2,3-b]thiopyran-4,5-diones by a Double Annulation Strategy from Dialkenoylketene Dithioacetals
Further Information
Received
30 March 2007
Publication Date:
03 July 2007 (online)
Publication History
Publication Date:
03 July 2007 (online)
Abstract
An efficient synthetic procedure for substituted 2,3,6,7-tetrahydrothiopyrano[2,3-b]thiopyran-4,5-diones by a double annulation strategy is described. The ring systems are made in good yields from readily available dialkenoylketene dithioacetals in the presence of either sodium sulfide nonahydrate/N,N-dimethylformamide (DMF) or a sodium hydride/DMF/amine system.
Key words
amines - annulations - dialkenoylketene dithioacetals - sodium hydride - sodium sulfide
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