A series of 12-aminotetrahydroisoquinocarbazoles and relatedcompounds were synthesized using an intramolecular Diels-Alder reaction and screened for antiarrhythmic activity in chloroform-induced ventricular arrhythmias in mice. Several compounds showed more potent activity than disopyramide. There was some correlation between substituents on aromatic ring and angular position, and antiarrhythmic activity
Intramolecular Diels-Alder reaction of 3-formimidoylindoles having olefinic substituents at the 1-position of the indole ring gave stereoselectively fused pyridoindole compounds. Double bond migration from 2,3,3a,4,12,12a,12b,12c-octahydrobenz[de]inidolo[3,2,1-ij][1,6]naphthyridin-11(1H)-ones (4) to 2,3,3a,4,5,12,12a,12b-octahydrobenz[de]indolo[3,2,1-ij][1,6]naphthyridin-11(1H)-one (5) was performed using 10% Pd-C as a catalyst.