Research Article

Synthesis, Molecular Modeling, and Biological Evaluation of Novel Tetrahydro-β-Carboline Hydantoin and Tetrahydro-β-Carboline Thiohydantoin Derivatives as Phosphodiesterase 5 Inhibitors

Scheme 3

Synthesis of tetrahydro-β-carboline thiohydantoin derived from D-tryptophan.
562421.sch.003