A compound of formula III
wherein
(1) when n signifies 2, R4 signifies hydrogen, alkyl group or alkylaryl group; R5 signifies a hydroxyl protecting group and R6 signifies an amino protecting group; or
(2) when n signifies 3, R5 signifies a hydroxyl protecting group; and R4 and R6 taken together represent a phthalimido group
and wherein the hydroxyl protecting group is an organosilyl group; the amino protecting group is an alkyl carbamate or alkylaryl carbamate group; the term alkyl means hydrocarbon chains, straight or branched, containing from one to six carbon atoms, optionally substituted by aryl, alkoxy, halogen, alkoxycarbonyl or hydroxycarbonyl groups; the term aryl means a phenyl or naphthyl group, optionally substituted by alkoxy, halogen or nitro group; and the term halogen means fluorine, chlorine, bromine or iodine.
式 III 的化合物
其中
(1) 当 n 表示 2 时,R4 表示氢、烷基或烷基芳基;R5 表示羟基保护基团,R6 表示
氨基保护基团;或
(2) 当 n 表示 3 时,R5 表示羟基保护基团;R4 和 R6 合在一起表示邻苯二甲
酰亚胺基团
其中羟基保护基团为有机
硅基团;
氨基保护基团为
氨基甲酸烷基酯或
氨基甲酸烷基芳基酯基团;术语烷基指含有 1 至 6 个碳原子的直链或支链烃链,可选择被芳基、烷氧基、卤素、烷氧基羰基或羟基羰基取代;术语芳基指苯基或
萘基,可选择被烷氧基、卤素或硝基取代;术语卤素指
氟、
氯、
溴或
碘。