A new process is provided for preparing the key carbapenem intermediates of the formula ##STR1## wherein R.sup.5 and R.sup.6 each independently represent hydrogen or methyl and R.sub.1 represents a conventional carboxyl-protecting group.
提供了一种新的制备公式为##
STR1##的关键
碳青霉
烯中间体的过程,其中R.sup.5和R.sup.6分别独立表示
氢或
甲基,R.sub.1表示传统的羧基保护基团。