title: Solid phase synthesis of 3,4,7-trisubstituted 4,5,8,9-tetrahydro-3H-imidazo[1,2-a][1,3,5]triazepin-2(7H)-thiones and N-alkyl-4,5,7,8-tetrahydro-3H-imidazo[1,2-a][1,3,5]triazepin-2-amines.
abstract: The solid-phase parallel synthesis of 3,4,7-trisubstituted 4,5,8,9-tetrahydro-3H-imidazo[1,2-a][1,3,5]triazepin-2(7H)-thiones and N-alkyl-4,5,7,8-tetrahydro-3H-imidazo[1,2-a][1,3,5]triazepin-2-amines starting from resin-bound dipeptides is described. The key synthetic steps involve the cylization of an amino and a guanidino functionality using thiocarbonyldiimidazole and the subsequent transformation of the resulting thiourea moiety to a substituted guanidine group using HgCl(2) and various amines. Following cleavage from the resin, the desired products were obtained in good yields and good to moderate purities, depending on the building blocks employed.
authors.affiliation: Torrey Pines Institute for Molecular Studies, 3550 General Atomics Court, San Diego, California 92121, USA.
authors.forename: Cornelia E
authors.initials: CE
authors.lastname: Hoesl
authors.forename: John M
authors.initials: JM
authors.lastname: Ostresh
authors.forename: Richard A
authors.initials: RA
authors.lastname: Houghten
authors.forename: Adel
authors.initials: A
authors.lastname: Nefzi
mesh_terms: D002851:Chromatography, High Pressure Liquid; D020650:Combinatorial Chemistry Techniques / Q000379:methods*; D003500:Cyclization; D006146:Guanidines / Q000737:chemistry*; D015394:Molecular Structure; D014227:Triazines / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D006146:Guanidines; D014227:Triazines