A Facile Synthesis of [1]Benzopyrano[4,3
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Ivano, Ivo C. ;Karagiosov, Stoyan K. ;Simeonov, Mario F.
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Article
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1992
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John Wiley and Sons
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English
β 455 KB
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## Abstract The title compounds 5aβc and 7aβm have been prepared by Vilsmeier formylation of 4βaminocoumarins 1 yielding aldehydes 2, and subsequent condensation of 2 with CβH acids in the presence of piperidine. This condensation probably proceeds via the intermediate ylidenemalonic esters 4. By m