申请人:Otsuka Kagaku Kabushiki Kaisha
公开号:US06339152B1
公开(公告)日:2002-01-15
The present invention is directed to a process for preparing an exo-methylenepenam compound wherein a cephem compound is reduced with a metal having a standard oxidation-reduction potential of up to −0.3 (V/SCE) in an amount of at least one mole per mole of the cephem compound and with a metal compound having a higher standard oxidation reduction potential than the metal and in an amount of 0.001 to 10 moles per mole of the cephem compound and wherein X is a halogen atom, lower alkylsulfonyloxy, trifluoromethanesulfonyloxy, trichloromethanesulfonyloxy, arylsulfonyloxy, toluenesulfonyloxy, or halogenated sulfonyloxy
本发明涉及一种制备外环亚甲基青霉烷化合物的方法,其中将头孢菌素化合物与具有标准氧化还原电位高达-0.3(V/SCE)的金属在摩尔比下至少一摩尔的量还原,并与具有比金属更高标准氧化还原电位的金属化合物在头孢菌素化合物的摩尔比下为0.001到10摩尔的量还原,其中X是卤素原子、低碳基磺酰氧基、三氟甲磺酰氧基、三氯甲磺酰氧基、芳基磺酰氧基、甲苯磺酰氧基或卤代磺酰氧基。