t-Butyl 2-ethoxycarbonylcarbapen-1-em-3-exo-carboxylate (1a) reacts with osmium (VIII) oxide to give t-butyl (1SR,5SR,7RS,8RS)-1-ethoxycarbonyl-8-hydroxy-2-oxa-6-azabicyclo[3.2.1]octane-7-carboxylate (7a).
2-乙氧基羰基咔啉-1-em-3-
羧酸叔丁酯(1a)与氧化(VIII)反应生成叔丁基(1 SR,5 SR,7 RS,8 RS)-1-乙氧基羰基-8 -羟基-2-氧杂-
6-氮杂双环[3.2.1]辛烷-7-
羧酸盐(7a)。