发明授权
US4992541A Process for the preparation of 1,1-dioxo-7-substituted cephems 失效
制备1,1-二氧代-7-取代头孢烯的方法

Process for the preparation of 1,1-dioxo-7-substituted cephems
摘要:
The present invention relates to an improved process for the preparation of the compounds of formula (I) ##STR1## which involve the direct oxidation without N-protection of the compound of the formula (II) ##STR2##
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