作者:Mandeep Singh、Galit Parvari、Mark Botoshansky、Ehud Keinan、Ofer Reany
DOI:10.1002/ejoc.201301672
日期:2014.2
precursor of all cucurbiturils, its sulfur analog represents a yet unmet synthetic challenge. The reaction between glyoxal and thiourea was found to stop at the level of dihydroxyimidazolidine-2-thione, which is quite unstable under various acidic conditions. In an attempt to answer these questions, several stable analogs of thioglycoluril, that is, monothioglycoluril, ditolylthioglycoluril, and its diether
葫芦脲在严酷的酸性条件下非常高的稳定性以及它们在 30 多年间报告的多产化学性质提出了一个问题:为什么迄今为止还没有硫葫芦脲的报道?此外,尽管甘脲是所有葫芦脲的高度稳定、易于获得的前体,但其硫类似物代表了尚未满足的合成挑战。发现乙二醛和硫脲之间的反应在二羟基咪唑烷-2-硫酮的水平上停止,其在各种酸性条件下非常不稳定。为回答这些问题,制备并表征了几种稳定的巯基脲类似物,即单巯基脲、二甲苯基巯基脲及其二醚衍生物,希望它们可以用作构建