δ--α-aminoadipoyl--cysteinyl--propargylglycine, δ--α-aminoadipoyl--cysteinyl--cyanoalanine and δ--α-aminoadipoyl--cysteinyl--[4,4,5,5-2H4]-norvaline were synthesised and incubated with the enzyme Isopenicillin N Synthase (IPNS). All incubation mixtures contained biologically active products, and led to the isolation of four new penicillins (β-ethyl, α-acetylenic, α- and β-nitrile) following purification by
三个三肽δ- -α-aminoadipoyl- -cysteinyl- -propargylglycine,δ- -α-aminoadipoyl- -cysteinyl- -cyanoalanine和δ- -α-aminoadipoyl- -cysteinyl- - [4,4,5,5- 2合成H 4 ]-正缬
氨酸,并与异
青霉素N合酶(I
PNS)一起孵育。所有孵育混合物均含有
生物活性产物,并通过反相HPLC纯化后导致分离出四种新的
青霉素(β-乙基,α-炔属,α-和β-腈)。与I
PNS形成单取代
青霉素的立体
化学是合理的。