Chloral Hydrate as a Water Carrier for the Efficient Deprotection of Acetals, Dithioacetals, and Tetrahydropyranyl Ethers in Organic Solvents
作者:Sosale Chandrasekhar、Annadka Shrinidhi
DOI:10.1080/00397911.2013.876652
日期:2014.7.3
Abstract The efficient deprotection of several acetals, dithioacetals, and tetrahydropyranyl (THP) ethers under ambient conditions, using chloral hydrate in hexane, is described. Excellent yields were realized for a wide range of both aliphatic and aromatic substrates. The method is characterized by mild conditions (room temperatures or below), simple workup, and the ready availability of chloral hydrate
摘要 描述了在环境条件下使用水合氯醛在己烷中对几种缩醛、二硫代缩醛和四氢吡喃 (THP) 醚的有效脱保护。广泛的脂肪族和芳香族底物均实现了优异的产率。该方法的特点是条件温和(室温或低于室温),后处理简单,并且容易获得水合氯醛。在反应条件下不受影响的脱保护、丙酮化物、酯和酰胺中也观察到高化学选择性。产品通常通过色谱纯化并通过光谱进行鉴定。这些结果构成了对当前方法的新补充,该方法涉及有机合成中广泛采用的脱保护策略。反应的机理似乎很可能涉及底物吸附在微溶性水合氯醛表面上。图形概要