Simple and efficient synthesis of O-unprotected glycosyl thiourea and isourea derivatives from glycosylamines
作者:Óscar López、Inés Maya、José Fuentes、José G Fernández-Bolaños
DOI:10.1016/j.tet.2003.10.092
日期:2004.1
bolaamphiphiles (two-step synthesis) and of 2-amino-4,5-dihydro-(1,2-dideoxy-β-d-glucopyranoso)[1,2-d]oxazoles (three-step synthesis) from glycopyranosylamines are reported. The method involves the preparation of O-unprotected β-d-gluco (and d-galacto)pyranosyl isothiocyanates which are in equilibrium with the corresponding 1,2-cyclic thiocarbamates, coupling with amines to afford glycosyl thioureas and treatment
实用,简便且高产的一锅合成不同的O-未保护的吡喃葡萄糖基硫脲和硫脲基双亲苯胺(两步合成)以及2-氨基-4,5-二氢-(1,2-二脱氧-β-d-报道了从吡喃葡糖胺中得到的吡喃并吡喃糖)[1,2- d ]恶唑(三步合成)。该方法包括制备与相应的1,2-环硫代氨基甲酸酯处于平衡状态的O-未保护的β-d-葡萄糖(和d-半乳糖)吡喃糖基异硫氰酸酯,与胺类偶联以提供糖基硫脲,并用黄色汞处理(II )氧化物以生成反式稠合的双环异脲。以此方式制备了d-葡萄糖Trehazolin类似物。在原位转化Ñ,还报道了将N-二烷基,N'-吡喃葡萄糖基硫脲转化成相应的脲。