Patent ID: 8207328

Claim:
A compound represented by Formula 1: wherein R 1 is selected from the group consisting of optionally substituted acyl and optionally substituted alkyloxy-carbonyl; and R 2 is selected from the group consisting of optionally substituted benzyl, optionally substituted benzhydryl, optionally substituted trityl, and optionally substituted naphthylmethyl, wherein the R 1 and R 2 groups are optionally substituted with one substituent selected from the group consisting of halogen, nitro, amino, azido, oxo, hydroxyl, thiol, carboxy, carboxy ester, carboxamide, alkylamino, alkyldithio, alkylthio, alkoxy, acylamido, acyloxy, and acylthio, each substituent consisting of 1 to 3 carbon atoms, except for when R 1 is defined as the optionally substituted acyl group, wherein the optionally substituted acyl group may be substituted one or several times with at least one substituent selected from the group consisting of hydroxy, C 1-6 -alkoxy, C 2-6 -alkenyloxy, carboxy, oxo, C 1-6 -alkoxycarbonyl, C 1-6 -alkylcarbonyl, formyl, aryl, aryloxycarbonyl, aryloxy, arylamino, arylcarbonyl, heteroaryl, heteroarylamino, heteroaryloxycarbonyl, heteroaryloxy, heteroarylcarbonyl, amino, mono- and di(C 1-6 -alkyl)amino, carbamoyl, mono- and di(C 1-6 -alkyl)aminocarbonyl, amino-C 1-6 -alkyl-aminocarbonyl, mono- and di(C 1-6 -alkyl)amino-C 1-6 -alkyl-aminocarbonyl, C 1-6 -alkylcarbonylamino, cyano, guanidino, carbamido, C 1-6 -alkyl-sulphonyl-amino, aryl-sulphonyl-amino, heteroaryl-sulphonyl-amino, C 1-6 -alka-noyloxy, C 1-6 -alkyl-sulphonyl, C 1-6 -alkyl-sulphinyl, C 1-6 -alkylsulphonyloxy, nitro, C 1-6 -alkylthio, and halogen, wherein any alkyl or alkoxy group in the substituents for the optionally substituted acyl group may be substituted with at least one of hydroxy, C 1-6 -alkoxy, C 2-6 -alkenyloxy, amino, mono- and di(C 1-6 -alkyl)amino, carboxy, C 1-6 -alkylcarbonylamino, halogen, C 1-6 -alkylthio, C 1-6 -alkyl-sulphonyl-amino, and guanidino.