Three-component synthesis of functionalized 5-oxo-4,5-dihydroindeno[1,2-b]pyrans
- PMID: 16779612
- DOI: 10.1007/s11030-006-9022-8
Three-component synthesis of functionalized 5-oxo-4,5-dihydroindeno[1,2-b]pyrans
Abstract
Protonation of the reactive intermediates produced in the reaction between alkyl(aryl) isocyanides and dialkyl acetylenedicarboxylates by indan-1,3-dione leads to vinylnitrilium cations, which undergo carbon centered Michael type addition with the conjugate base of the CH-acid to produce functionalized 5-oxo-4,5-dihydroindeno[1,2-b]pyrans.
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