Rj. Friary et al., INTRAMOLECULAR TRANSAMINATIONS OF ENAMINONES - A SYNTHESIS OF FUSED, POLYCYCLIC, N-ARYL PYRIDONES, Tetrahedron, 49(33), 1993, pp. 7169-7178
2-Arylamino-3-pyridinecarbonyl chlorides acylated the beta-carbon atom
s of enamines, and the resulting enaminones cyclized to give a series
of fused polycyclic N-aryl pyridones. The series included 9,10-tetrahy
drobenzo[b][1,8]naphthyridin-5(7H)-one (Sch 40120), an antipsoriatic a
gent.