Process for preparing pyrrolidinone derivatives of (1) ##STR1## in which R is hydrogen, alkyl or acyl characterized in that a compound of (2) ##STR2## wherein R.sup.1 is hydrogen and R.sup.2 is benzyl or substituted benzyl, or R.sup.1 and R.sup.2 can together form a group ##STR3## where R.sup.4 and R.sup.5 are independently hydrogen, alkyl, phenyl or optionally substituted aryl or together are 1,4-butylene or 1,5-pentylene; R.sup.3 is hydrogen or straight or branched alkyl of 1 to 4 carbon atoms; and X is alkyl subjected to N-deprotection and the deprotected intermediate is cyclized intramolecularly. The deprotected intermediates can be isolated as acid-addition salts.
制备(1)中
吡咯烷酮衍
生物的过程,其中R为氢、烷基或酰基,其特征在于化合物(2)##STR2##其中R.sup.1为氢,R.sup.2为苄基或取代苄基,或R.sup.1和R.sup.2可以一起形成一个基团##STR3##其中R.sup.4和R.sup.5独立地为氢、烷基、苯基或可选择取代芳基,或者一起为1,4-
丁二烯或1,5-
戊二烯;R.sup.3为氢或1至4个碳原子的直链或支链烷基;X为烷基,经过N去保护后,脱保护的中间体被进行分子内环化。去保护的中间体可以作为酸盐形式分离。