摘要:
A compound useful as an anti-bacterial agent, having the formula wherein R2 together with the nitrogen atom to which it is attached forms a cyclic aminoguanidine group or derivative thereof as defined
摘要:
Cephalosporin derivatives of formula II ##STR1## wherein R.sup.a denotes hydrogen or a silyl group; R.sup.b denotes a group of formula --OR.sup.e, wherein R.sup.e denotes hydrogen or alkyl; and R.sup.c and R.sup.d together denote a bond; in free form or in salt form.
摘要:
Cephalosporin derivatives of formula ##STR1## wherein R.sub.1 signifies hydrogen or a silyl protecting group, processes for their production and their use as intermediate products.
摘要:
3-Imino-cephalosporin derivatives of formula II ##STR1## wherein Y denotes alkyl, aryl or heterocyclyl; and R.sup.a and R.sup.d denote hydrogen or a silyl group; in free form or in salt form, and methods of preparation.
摘要翻译:式II的3-亚氨基 - 头孢菌素衍生物,其中Y表示烷基,芳基或杂环基; R a和R d表示氢或甲硅烷基; 以游离形式或盐形式,以及制备方法。
摘要:
A process for the production of a 3-vinylcephalosporin compound of formula I wherein R1 and R2 may be the same or different and denote hydrogen or an organic radical, which comprises subjecting a 3-iodomethyl-cephalosporin to a Wittig reaction in the presence of a weak base.
摘要:
A process for the production of a 3-vinylcephalosporin compound of formula I wherein R1 and R2 denote hydrogen or an organic group by a Wittig reaction reacting first a compound of formula II with a compound of formula P(R4)3 or P(OR4)3 to produce a compound of formula III and secondly reacting the compound of formula III with a weak base of formula or of formula R10—COO−W+ wherein R5 is hydrogen, alkly or aryl and R6 and R7 are each an activated group of formula —COOR8, —CN, —SO2R8, —COR8 or —CON(R8)2; or R5 and R8 are each aryl and R7 is an activated group of formula —COOR8, —CN, —SO2R8, —COR8 or —CON(R8)2, W+ is an alkali metal cation and R10 is alkyl or aryl to produce a compound of formula IV and finally reacting a compound of formula IV with a compound of formula V to produce a compound of formula I.