S‐Acyl cysteine peptides containing α‐, β‐ or γ‐amino acid residues undergo long‐range S‐ to N‐acyl transfer to give analogs of native tripeptides and tetrapeptides containing additional carbon atoms in the chain. The ease of intramolecular S → N‐acyl transfer relative to intermolecular transacylation is favored increasingly for 9 < 12 < 13 ~ 10‐membered cyclic transition states; the observed order
含有α,β或γ
氨基酸残基的S酰基半胱
氨酸肽经历了从S到N酰基的长距离转移,从而提供了天然三肽和四肽在链中包含其他碳原子的类似物。在9 <12 <13〜10元环化过渡态下,分子内S → N酰基转移相对于分子间转酰基反应的难易程度越来越受到青睐。观察到的顺序解释了构象和分子间的相互作用。版权所有©2012欧洲肽协会和John Wiley&Sons,Ltd.