Journal
ORGANIC LETTERS
Volume 4, Issue 16, Pages 2629-2631Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol020088g
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[GRAPHICS] 4-(4'-Aryloxybut-2'-ynylthio)[1]benzopyran-2-ones are refluxed in chlorobenzene to afford 4-aryloxymethylthlopyrano[3,2-c][1]benzopyran-5(2H)-ones which are subsequently subjected to heating in o-dichlorobenzene in the presence of N,N-diethylaniline and then treated with pyridine hydrotribromide to give [6,6]pyranothiopyrans in almost quantitative yield.
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