S. Mataka, T. Ohshima, M. Tashiro
Sep 21, 1982
Journal of Heterocyclic Chemistry
Reaction of diazoindenothiophenes (1 and 2) with benzoyl acetylene (4) afforded the rearrangement products (6a and b) of the initial adducts. The major product of the reaction of diazo indenothiophene (3) with 4 was butadiene derivative 8a. Reaction of 1 with dibenzoylacetylene (5a) gave the rearranged pyrazole (12), while the reaction of 2 and 3, afforded the butadiene derivatives (8b-d).