Penicillins of the formula ##STR1## wherein R is hydrogen , sodium, potassium or certain ester groups; R.sub.1 is in the .alpha.-configuration and is hydrogen or methoxy; R.sub.2 is hydrogen, lower aklkyl, cycloalkyl, cycloalkenyl, cycloalkadienyl, substituted or unsubstituted phenyl, benzyl, phenethyl, thienyl, furyl, or pyridyl, or 2-amino-4-thiazolyl; R.sub.3 is lower alkyl or substituted or unsubstituted phenyl, benzyl, phenethyl, thienyl or furyl; and R.sub.4 is hydrogen or lower alkyl; are disclosed. These compounds possess useful antibacterial activity.
公式为##STR1##的
青霉素,其中R为氢,
钠,
钾或某些酯基; R.sub.1处于α构型,为氢或甲氧基; R.sub.2为氢,较低的烷基,环烷基,环烯基,环烷二烯基,取代或未取代的苯基,苄基,苯乙基,
噻吩基,
呋喃基或
吡啶基,或2-
氨基-4-
噻唑基; R.sub.3为较低的烷基或取代或未取代的苯基,苄基,苯乙基,
噻吩基或
呋喃基; R.sub.4为氢或较低的烷基; 这些化合物具有有用的抗菌活性。