A process for producing a compound of the formula: ##STR1## wherein R.sup.1 is a hydrogen atom, a lower alkyl group or an aralkyl group, and R.sup.2 is a hydrogen atom or a hydroxyl-protecting group, or a salt thereof, which comprises removing from a compound of the formula: ##STR2## wherein R.sup.3 is a hydrogen atom or a hydroxyl-protecting group, R.sup.4 and R.sup.5 which may be the same or different are N-protecting groups selected from the group consisting of lower alkyl groups and aralkyl groups, and X.sup..crclbar. is an anion, the N-protecting group(s), if necessary, together with the hydroxyl-protecting group.
一种生产以下化合物的方法:##
STR1## 其中R.sup.1是
氢原子、较低的烷基基团或芳基烷基基团,R.sup.2是
氢原子或羟基保护基团,或其盐,包括从以下化合物中去除的过程:##
STR2## 其中R.sup.3是
氢原子或羟基保护基团,R.sup.4和R.sup.5可能相同也可能不同,是从较低烷基基团和芳基烷基基团组成的羟基保护基团,以及X.sup..crclbar.是阴离子,N-保护基团(如有必要)与羟基保护基团一起。