The discovery of the anti-migraine drug sumatriptan (Imigran ® ) 1 has stimulated the search and design of second-generation 5-HT 1D receptor agonists. From the chemical point of view, many of these tryptamines (sumatriptan, 1 CP-122,288, 2 avitriptan, 3 almotriptan 4 ) have the common feature of possessing a sulfamoyl group attached at the indole 5 position through a methylene spacer (Fig. 1). ... In the context of the study of possible almotriptan ...