Chemodivergent, multicomponent domino reactions in aqueous media: l-proline-catalyzed assembly of densely functionalized 4H-pyrano[2,3-c]pyrazoles and bispyrazolyl propanoates from simple, acyclic starting materials
作者:Pitchaimani Prasanna、Subbu Perumal、J. Carlos Menéndez
DOI:10.1039/c3gc37128j
日期:——
excellent yield employing an L-proline-catalyzed, on-water four-component domino reaction from hydrazines, β-dicarbonyl compounds, nitriles and dialkylacetylenedicarboxylates that generates two rings by the creation of C–C (two), C–N, CN and C–O bonds and presumably involves a sequence of hydrazone formation, cyclocondensation, Michael, [1,3]-hydrogen shift, Michael addition and 6-exo-dig annulation