申请人:E. R. Squibb & Sons, Inc.
公开号:US04111978A1
公开(公告)日:1978-09-05
New compounds of the following general formula, and their salts ##STR1## wherein R.sub.1 and R.sub.2 each is hydrogen, lower alkyl, lower alkenyl, phenyl, hydroxyphenyl, chlorophenyl, benzyl, phenethyl, or R.sub.1 and R.sub.2 together complete a cyclopentyl or cyclohexyl group; R.sub.3 is hydrogen, lower alkyl, lower alkenyl, cyclopentyl, cyclohexyl, phenyl, hydroxyphenyl, aminophenyl, chlorophenyl, benzyl, furyl, thienyl, pyrrolidyl or pyridyl; and R.sub.5 is hydrogen or lower alkyl; are intermediates for the production of cephalosporin derivatives.
以下是通用式的新化合物及其盐,其中R1和R2分别为氢、较低的烷基、较低的烯基、苯基、羟基苯基、氯苯基、苄基、苯乙基,或R1和R2共同组成环戊基或环己基;R3为氢、较低的烷基、较低的烯基、环戊基、环己基、苯基、羟基苯基、氨基苯基、氯苯基、苄基、呋喃基、噻吩基、吡咯基或吡啶基;R5为氢或较低的烷基。这些化合物是头孢菌素衍生物的中间体。