New heterocyclic systems. Benzo[4,5]cyclohepta[1,2-<i>b</i>]pyrrole and benzo[5,6]cyclohepta[1,2-<i>f</i>]pyrrolizidine derivatives
作者:J. Ackrell、F. Franco、R. Greenhouse A. Guzmàn、J. M. Muchowski
DOI:10.1002/jhet.5570170546
日期:1980.7
The synthesis of the polycyclic pyrrole acetic acids 9e, 13e and 13g by multistep processes from 1-bromo-4-phenylbutan-2-one (6c) is reported. An instance of the use of the 2-chloroethyl moiety as a pyrrole nitrogen protecting group is described. The α-methylaminoketone (6e) was synthesised by a novel two step process from 6c and methyl N-methylformimidate (12).