2-methyl-6-phenyl-1,2,3,4,4a,5,6,10b-octahydrobenzo-(c)-(1,6) naphthyridine compounds

Abstract From the Canadian patent

2-METHYL-6-PHENYL-1,2,3,4,4a,5,6,10b-OCTAHYDROBENZOc-1,6 NAPHTHYRIDINE COMPOUNDS, Abstract of the Disclosure This invention provides new compounds of formula I, I, wherein the indicated radical in the 8 or 9 position cf the benzonaphthyridine structure (R1) is hydrogen alkoxy of 1 to 4 carbon atoms or hydroxy and, R2, R3 and R4 are selected in certain combinations from hydrosen, alkyl of 1 to 4 carbon atoms alkoxy of 1 to 4 carbon atoms, benzyloxy hydroxy, halogen, nitro, amino, dimethylamino or -NHCOR5, wherein R5 is hydrogen or alkyl of 1 to 4 carbon atoms, useful as bronchospasmolytics.