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。
A practical one-pot synthesis of O-unprotected glycosyl thioureas
作者:Inés Maya、Óscar López、José G Fernández-Bolaños、Inmaculada Robina、José Fuentes
DOI:10.1016/s0040-4039(01)01039-5
日期:2001.8
An expeditious and high-yielding one-pot procedure to prepare different types of O-unprotected N-beta -D-glycopyranosyl, N'-substituted thioureas and di-beta -D-glucopyranosyl thioureido bolaamphiphiles from beta -D-glycopyranosylamines via O-unprotected glycopyranosyl isothiocyanates has been developed. (C) 2001 Elsevier Science Ltd. All rights reserved.
New synthetic approaches to sugar ureas. Access to ureido-β-cyclodextrins
作者:Óscar López、Susana Maza、Inés Maya、José Fuentes、José G. Fernández-Bolaños
DOI:10.1016/j.tet.2005.07.041
日期:2005.9
An efficient method for the preparation of urea-bridged cyclodextrins using triphosgene in the isocyanation step in an aqueous two-phase system is reported. Per-O-acetylated glycopyranosylamines and 2-amino-2-deoxy-alpha and beta-D-glucose were also transformed into the corresponding isocyanates using either an aqueous two-phase or an anhydrous dichloromethane medium, and converted in situ into ureas. An alternative method for the preparation of sugar-derived ureas consisting of desulfurization of sugar thioureas with mercury oxide is also presented. (c) 2005 Elsevier Ltd. All rights reserved.