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.
改进的工艺用于制备中间体,有助于制备抗菌N-[1-氧代-2-烷基-3-(N-羟基甲酰胺基)-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,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,对映异构纯取代
丙酸,特别是(R)-2-丁基-3-羟基-
丙酸;(3)避免使用
过氧化氢;(4)有助于选择性脱苄基,减少废弃产物的产生。