A highly convenient method for the synthesis of 2-substituted pyrrole derivatives 7a-c from pyrrole using phosgene was developed. Successively, 7-methyl-6,7-dihydro-1H,5H-pyrrolo[2,3-c]azepine-4,8-dione 1a and 6,7-dihydro-1H,5H-pyrrolo[2,3-c]azepine-4,8-dione 1b (aldisin) were synthesized by phosphorus pentoxide/methanesulfonate and polyphosphoricacid cyclization.
Disclosed herein are pyrroloazepine derivatives represented by the following formula (I):
wherein R means a hydrogen atom, a linear or branched C1-6 alkyl group or a C7-1 10 aralkyl group, A denotes a linear or branched C2-10 alkylene, alkenylene or alkynylene group, Z stands for 0, NOR1 or NOCORs in which R1 and Rs is a hydrogen atom or an alkyl, aryl or aralkyl group, and Y means a particular piperidinyl or pyrrolidinyl group; and salts thereof. Their preparation processes are also disclosed.