Russian Journal of Plant Physiology.
Vol. 55.
2008.
P. 463-468
(Chemical Equation Presented) Reaction of 10-cyanotetrahydrobenzo[b][1,6] naphthyridines (1-6) with activated alkynes affords stable benzo[b]pyrrolo[2,1- f][1,6]naphthyridine-4-ium ylides (7-14) in moderate yields. A proposed mechanism for their formation consists of a new tandem multistage process. © 2008 American Chemical Society.