Novel 2-azetidinones of the formula ##STR1## wherein R is alkyl of 1 to 4 carbon atoms, R.sub.1 is selected from the group consisting of hydrogen, --OH, protected hydroxy and --OCH.sub.2 --COOR', R' is selected from the group consisting of hydrogen and alkyl of 1 to 4 carbon atoms and R.sub.2 is selected from the group consisting of alkyl of 1 to 4 carbon atoms and hydroxyl protective group and a novel process and novel intermediates for their preparation and a process for the preparation of compounds of the formula ##STR2## wherein R has the above definition, R'd is selected from the group consisting of hydrogen, --OH and protected hydroxyl and R.sub.3 is selected from the group consisting of hydrogen and R.sub.3 ', R.sub.3 ' is amino protective group which are useful intermediates.
化合物的新型2-氮杂
环戊酮,其
化学式为##STR1## 其中R是1至4个碳原子的烷基,R.sub.1选自氢、--OH、保护羟基和--OCH.sub.2--COOR'的群组,R'选自氢和1至4个碳原子的烷基,R.sub.2选自1至4个碳原子的烷基和羟基保护基团,以及其制备的新型过程和新型中间体,以及制备化合物的过程##STR2## 其中R具有上述定义,R'd选自氢、--OH和保护羟基,R.sub.3选自氢和R.sub.3',R.sub.3'是
氨基保护基团,这些中间体是有用的。