Abstract: Full details of the total synthesis of PDE I (2) and PDE I1 (3), two 3', 5'-CAMP phosphodiesterase inhibitors possessing the identical, functionalized 1, 2-dihydro-3H- pyrrolo [3, 2-e] indole structure constituting the central and right-hand segments of the potent antitumor antibiotic CC-1065 (l), are described. The linkage of two 1, 2-dihydro-3H-pyrrolo [3, 2-e] indole units in the preparation of PDE-I dimer methyl ester (4) is detailed and ...