A compound of the formula ##STR1## in which R is hydrogen, or optionally substituted alkyl, alkenyl, alkinyl, aralkyl, aryl, heteroaryl, heteroaralkyl, aryloxyalkyl, heteroaryloxyalkyl, alkoxyalkyl, arylthioalkyl, heteroarylthioalkyl, alkylthioalkyl, alkoxy, aryloxy, alkylthio or arylthio. The compounds are prepared by novel processes and are suitable as intermediates for .beta.-lactam antibiotics.
公式为##STR1##的化合物,其中R为氢,或可选的取代基的烷基,烯基,炔基,芳基烷基,芳基,杂环芳基,杂环芳基烷基,芳氧烷基,杂环芳氧烷基,烷氧基烷基,芳
硫烷基,杂环芳
硫烷基,烷
硫烷基,烷氧基,芳氧基,烷
硫基或芳
硫基。这些化合物是通过新型工艺制备的,适用于β-内酰胺类抗生素的中间体。