The number and the pharmacological activities of drugs featuring a guanidine group is actually amazing. Many synthetic guanidine derivatives have attracted pharmacologists in search of new antihypertensive drugs for their ability to block adrenergic nerve activity through central and/or peripheral
Caracasanamide, one of the hypotensive agents isolated from Verbesina caracasana, is a mixture of (Z)-1a and (E)-1b forms of 1-[(3,4-dimethoxycinnamoyl)amino]-4- [(3-methyl-2-butenyl)-guanidino]butane. The structure of (E)-caracasanamide (1b) was confirmed by high-yielding synthesis starting from
Caracasandiamide, a second hypotensive agent isolated from Verbesina caracasana, is the cyclobutane dimer (truxinic type) of the previously reported 1-[(3, 4-dimethoxycinnamoyl)amino]-4-[(3-methyl-2-butenyl)guanidino]butane (caracasanamide) (Delle Monache, G.; et al. BioMed. Chem. Lett. 1992, 25,
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