Compounds of formula I:
wherein:
R1 is hydrogen or alkyl;
R2 is alkyl optionally substituted by one or more alkoxy groups or halogen atoms;
X is a group of formula -OR3 wherein R3 is alkyl, cycloalkyl, or arylalkyl; or X is a group of formula -NHCVR4 wherein V is oxygen or sulphur, R4 is hydrogen, alkyl, cycloalkyl (which alkyl and cycloalkyl groups may be substituted), alkenyl, aryl, arylalkyl, amino, mono- or di-alkylamino or a group of the formula -OR5 wherein R5 is optionally substituted alkyl, aryl or arylalkyl; or X is a group of formula -NHSO2R4a wherein R4a is alkyl, aryl or a group of formula -CH2COR4b wherein R4b is alkyl or aryl;
Y is optionally substituted alkoxy, cycloalkoxy, arylalkoxy or a group of formula -NR6R7 wherein R6 is hydrogen or alkyl and R7 is alkyl, cycloalkyl (which alkyl and cycloalkyl groups may be substituted), aryl or arylalkyl or R7 is a group of formula -COOR8 wherein R8 is alkyl are useful intermediates in the synthesis of beta-lactam antibiotics.
式 I 的化合物:
其中
R1 是氢或烷基
R2 是被一个或多个烷氧基或卤素原子任选取代的烷基
X是式-OR3的基团,其中R3是烷基、环烷基或芳烷基;或 X是式-NHCVR4的基团,其中V是氧或
硫,R4是氢、烷基、环烷基(烷基和环烷基可被取代)、烯基、芳基、芳烷基、
氨基、单或双烷基
氨基或式-OR5的基团,其中R5是任选被取代的烷基、芳基或芳烷基;或 X 是式-NHSO2R4a(其中 R4a 是烷基、芳基)或式-CH2COR4b(其中 R4b 是烷基或芳基)的基团;
Y 是任选取代的烷氧基、环烷氧基、芳基烷氧基或式-NR6R7 的基团,其中 R6 是氢或烷基,R7 是烷基、环烷基(烷基和环烷基可被取代)、芳基或芳基烷基或 R7 是式-COOR8 的基团,其中 R8 是烷基。