Abstract
PDE-I (I), a new inhibitor of cyclic adenosine-3', 5'-monophosphate phosphodiesterase, was synthesized in seven steps of reactions from 1-acetyl-2, 3-dihydro-7-hydroxy-6-methoxy-5-nitro indole (III) via the key intermediate, 5-amino-1-carbamoyl-2, 3-dihydro-7-hydroxy-6-methoxy indole (VII), which has the hydroindole skelton and the sites for the introduction of the pyrrole moiety necessary for the preparation of 1.
