α-d-Galacto-2-deoxy-oct-3-ulopyranosonic acids can be converted into unnatural glycopeptides via a one pot intramolecular Ritter reaction. Initially, the ketopyranoside reacts under Lewis acid catalyzed conditions with a nitrile (aromatic or aliphatic) to form a glycosylimino anhydride intermediate which can be isolated. Exposure of this intermediate to simple priamary amines or amino acids produces novel sugar-β-peptides. Three different nitriles and three different amines have been used to generate 6 sugar β-peptides to demonstrate the generality of this reaction.
α-d-Galacto-2-deoxy-oct-3-ulopyranosonic酸可以通过一锅内分子Ritter反应转化为非天然糖肽。最初,酮
吡喃苷在
路易斯酸催化条件下与亲核剂(芳香族或脂肪族)反应,形成可分离的糖基
亚胺酸酐中间体。将该中间体暴露于简单的初级胺或
氨基酸中,生成新型的糖-β-肽。使用了三种不同的腈和三种不同的胺,以生成6种糖β-肽,证明了这一反应的普遍性。