Photocyclisation of enamides. Part 20. Photocyclisation ofN-naphthylacrylamides and synthesis of the basic indolo[4,3-fg]quinoline nucleus of ergot alkaloids
Abstract
Photocyclisation of some N-naphthylacrylamides (1)–(6) provided a general synthetic route to benzo [H]-and benzo[f]-quinolines (7)–(12) and two compounds containing the basic indolo[4,3-fg] quinoline nucleus of ergot alkaloids, (17) and (21), were readily prepared.