On the stability of S-(alkylsulfanyl) cysteine derivatives during solid-phase synthesis
作者:B. H. Rietman、R. F. R. Peters、G. I. Tesser
DOI:10.1002/recl.19951140102
日期:——
that the tritylsulfanyl group as a thiol protection is comparable with the tert-butylsulfanyl group in these respects. It is stable in trifluoroacetic acid and is rapidly reduced by thiols and phosphines. For all three cysteine esters rapid racemization was observed in piperidine (25%) in DMF, the amides being chirally stable. The demonstrated chiral instability of cysteine esters has consequences for
Ñ乙酰基小号- (烷硫基)半胱氨酸苄酯合成为模型ñ -acylated小号- (烷硫基)的半胱氨酸残基通过酯键与固相连接的。涉及的S-保护是:乙基硫烷基,成熟的叔丁基硫烷基和新开发的三苯甲基硫烷基。我们研究了使用Fmoc策略(Fmoc SPPS)在固相肽合成中常用的试剂中二硫化物的化学行为。发现三苯乙硫基作为硫醇保护剂与叔酸相当。在这些方面,丁基-硫烷基。它在三氟乙酸中稳定,并被硫醇和膦迅速还原。对于所有三种半胱氨酸酯,在DMF中的哌啶(25%)中均观察到快速消旋,酰胺具有手性稳定。已证明的半胱氨酸酯的手性不稳定性对使用Fmoc方案进行肽的固相合成有影响。