申请人:Shionogi & Co., Ltd.
公开号:US04592865A1
公开(公告)日:1986-06-03
Intermediates of the following formula are useful for the synthesis of 1-oxacephalosporins. Their preparation from penicillins and the transformation process to make 1-oxacephalosporins are disclosed. The compounds are of the formula: ##STR1## wherein A is amino or a selected acylamino; COB is carboxy or a selected protected-carboxy; X is halogen or the group OR in which R is a group represented by following formulas: ##STR2## wherein Nu is a selected nucleophilic group; R.sup.1 is a group of the following formula: ##STR3## in which Hal is halogen or alkylsulfonyloxy and R.sup.2 is alkyl or aryl; and Y is hydrogen or methoxy; with the proviso that when R is propargyl or 2-oxopropyl and R.sup.1 is ##STR4## A is in the 3.alpha.-configuration and Y is 3.beta.-hydrogen or A is in the 3.beta.-configuration and Y is 3.alpha.-methoxy.
以下公式的中间体对于合成1-氧代头孢菌素很有用。从青霉素中制备这些中间体,并且揭示了制作1-氧代头孢菌素的转化过程。这些化合物的公式为:##STR1## 其中,A是氨基或选定的酰胺基;COB是羧基或选定的保护羧基;X是卤素或OR基团,其中R是由以下公式表示的基团:##STR2## 其中Nu是选定的亲核基团;R1是以下公式的基团:##STR3## 其中Hal是卤素或烷基磺酰氧基,R2是烷基或芳基;而Y是氢或甲氧基;但是当R为丙炔基或2-氧代丙基,且R1为##STR4## 时,A处于3α构型,Y为3β-氢或A处于3β构型,Y为3α-甲氧基。