As part of a program of medicinal chemistry undertaken a few years ago, 1., , , , and we are pursuing investigations on the synthesis and reactivity of heterocycles containing nitrogen. Recently we were confronted with the preparation of quinoline derivatives. Our experience in arynic chemistry , and 2. led us to consider the use of didehydroquinolines as intermediates. Taking account of the results previously obtained in the pyridine series, 2., and we anticipated that these ...