E. Csuzdi et al., NEW FORMATION OF PYRROLIZINES BY INTRAMOLECULAR CYCLIZATION OF PHENACYL SUBSTITUTED TETRAHYDROPYRIDINES, Synlett, (6), 1994, pp. 429-430
Cyclization of 1 -phenacyl-4-phenyl- 1,2,5,6-tetrahydropyridines under
acidic conditions resulted 1,7-bis-phenyl-5,7a-dihydro-3H-pyrrolizine
s, and the originally expected 4,6-bis-phenyl-1-azabicyclo[3.2.1]octa-
3,6-diene system was produced as a minor product.