Improved processes for preparing intermediates useful for preparing antibacterial N-[1-oxo-2-alkyl-3-(N-hydroxyformamido)-propyl}-(carbonylamino-aryl or -heteroaryl)-azacyclo4-7alkanes or thiazacyclo4-7alkanes, which have one or more of the following features: (1) make use of a particular β-lactam intermediate; (2) which make use of a particular resolving agents, enantiomerically pure substituted propionic acids, especially (R)-2-butyl-3-hydroxy-propionic acid; (3) which avoid the use of hydrogen peroxide; and (4) which facilitate selective debenzylation reducing production of waste by-products.
改进的过程,用于制备抗菌N-[1-氧代-2-烷基-3-(N-羟甲酰胺基)-丙基]-(羰基
氨基)-芳基或杂环芳基-氮杂环4-7烷或
硫杂环4-7烷的中间体,具有以下一项或多项特征:(1)利用特定的β-内酰胺中间体;(2)利用特定的分离剂,对映纯的取代
丙酸,尤其是(R)-2-丁基-3-羟基-
丙酸;(3)避免使用
过氧化氢;以及(4)促进选择性去苄基化,减少废弃副产物的产生。