Studies on Seven-membered Ring Compounds. XIII. Reaction of 2-Bromo-7-methoxytropone with Active Methylene Compounds

Reaction of 2-bromo-7-methoxytropone (III) with active methylene compounds was carried out. III reacted with malononitrile to afford heptafulvene derivative, whereas III reacted with cyanoacetamid, diethyl malonate and ethyl p-nitrophenylacetate to yield rearrangement products, coumarin derivatives. III didn't react with ethyl carbamoylacetate, 2-cyanoacetophenone and cyanoacetone, which easily reacted with 2-chlorotropone.