Reaction of monothio-derivatives of 2-heteroarylideneindene-1,3(2H)-diones with quinones
Abstract
The reaction of 2,3-dihydro-2-[2(1H)-pyridylidene]-3-thioxoinden-1-one (5) with 1,4-benzoquinone and with 1,4-naphthoquinone in alcohols afforded thiobenzoylindolizinoquinones (7) and (12) which were characterised by spectroscopy and by oxidation and reduction reactions. In a similar reaction with 1,4-naphthoquinone the 2-isoquinolin-3-ylidene-derivative (6) afforded the pentacyclic quinone (20); the 2-quinolin-2-ylidene-derivative (18) did not undergo the reaction.