SYNTHESIS OF NEW PYRROLO[3,2-<i>l</i>]ACRIDINONES AND PYRROLO[3,2-<i>c</i>][1,8]NAPHTHYRIDINONES BY CONDENSATION OF METHOXYBENZENES OR PHENOLS WITH ISOBUTYRIC ALDEHYDE AND <i>o</i>-AMINONITRILES
DOI:
https://doi.org/10.1007/4074Keywords:
o-aminonitriles, arenes, isobutyric aldehyde, pyrrolo[3, 2-l]acridinone, 2-c][1, 8]naphthyridinone, sulfuric acid, aza-Michael reaction, dearomatization, domino reaction.Abstract
A reaction of methoxybenzenes or phenols with isobutyric aldehyde and 2-amino-5-nitro- or 2-amino-4-chlorobenzonitriles in concentrated H2SO4 medium was used for the preparation of new pyrrolo[3,2-l]acridinone derivatives. Analogous reactions using 2amino-3-pyridinecarbonitrile enabled the synthesis of previously unknown benzo[b]pyrrolo[3,2c][1,8]naphthyridinones.