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    • 20. 发明授权
    • Hydroxy protecting group removal in penems
    • 半胱氨酸中的羟基保护基团去除
    • US5457193A
    • 1995-10-10
    • US400013
    • 1995-03-06
    • Angelo BedeschiFranco Zarini
    • Angelo BedeschiFranco Zarini
    • C07D499/897C07D499/88C07D499/00
    • C07D499/88Y02P20/55
    • The present invention relates the removal of t-butyldimethylsilyl protecting groups in the preparation of penems which are useful antibiotics. The invention provides a process for preparing a compound of the formula I: ##STR1## wherein R is a free or protected hydroxy or amino group or an alkoxy, acyloxy or an optionally substituted carbamoyloxy group, and R.sub.1 is selected from:a) hydrogen;b) a C.sub.2 -C.sub.4 alkenyl group;c) a p-NO.sub.2 benzyl group;d) a linear or branched alkanoyloxy C.sub.1 -C.sub.2 alkyl group; ande) (2-oxo-1,3-dioxolen-4-yl)methyl optionally substituted by C.sub.1 -C.sub.4 alkyl at the 5-position or a pharmaceutically acceptable salt thereof, which process comprises reacting a compound of the formula II: ##STR2##
    • 本发明涉及在作为有用的抗生素的青霉烯制剂中除去叔丁基二甲基甲硅烷基保护基。 本发明提供了制备式I化合物的方法:其中R是游离或保护的羟基或氨基或烷氧基,酰氧基或任选取代的氨基甲酰氧基,R 1选自:a)氢 ; b)C 2 -C 4烯基; c)p-NO 2苄基; d)直链或支链烷酰氧基C 1 -C 2烷基; 和e)任选被5-位的C 1 -C 4烷基取代的(2-氧代-1,3-二氧杂环戊烯-4-基)甲基或其药学上可接受的盐,该方法包括使式II化合物: 图像> II