LiBr catalyzed solvent-free ring expansion of epoxides to 1,4-oxathian-2-ones with α-mercaptocarboxylic acids
作者:Atul K. Singh、Ankita Rai、Lal Dhar S. Yadav
DOI:10.1016/j.tetlet.2011.05.010
日期:2011.7
An efficient and rapid (10–20 min) one-pot synthesis of chemically and pharmaceutically interesting 1,4-oxathian-2-ones is reported. The protocol involves LiBr catalyzed regioselective ring-opening–ring-closing reaction cascade of terminal epoxides with α-mercaptocarboxylic acids at rt under solvent-free conditions. Recycling of the catalyst, atom economy, and formation of water as the only by-product
据报道,一种有效且快速的(10-20分钟)一锅法合成的化学和药学上令人感兴趣的1,4-氧杂亚砜-2-酮。该方案涉及在室温下在无溶剂条件下,LiBr催化的末端环氧化物与α-巯基羧酸的区域选择性开环-闭环反应级联。催化剂的再循环,原子经济性和形成水作为本合成中唯一的副产物是与绿色化学有关的其他优点。