Reaction of 4-hydroxy-2-quinolones with thionyl chloride—preparation of new spiro-benzo[1,3]oxathioles and their transformations
作者:Antonín Klásek、Ondřej Rudolf、Michal Rouchal、Antonín Lyčka、Aleš Růžička
DOI:10.1016/j.tet.2012.11.034
日期:2013.1
4-Hydroxy-2-quinolones (1) react with thionyl chloride to give new spiro-benzo[1,3]oxathioles (3) and bis(4-hydroxy-2-quinolone-3-yl)sulfides (2) and small quantities of 3-chloro-4-hydroxyquinolin-2-ones (4). Compounds 3 afford sulfides 2 by heating in different solvents and [1,4]oxathiino[3,2-c:5,6-c′]diquinoline-6,8(5H,9H)-diones (6) by reaction with triphenylphosphine. The reconversion of compounds
4-羟基-2-喹诺酮类(1)与亚硫酰氯反应生成新的螺-苯并[1,3]草硫醇(3)和双(4-羟基-2-喹诺酮-3-基)硫化物(2)和少量数量的3-氯-4-羟基喹啉-2-酮(4)。通过在不同的溶剂中加热,化合物3提供了硫化物2,并通过反应生成了[1,4]氧代吡啶并[3,2- c:5,6- c ']二喹啉-6,8(5 H,9 H)-二酮(6)与三苯膦。化合物2至3的转化是使用溴实现的。讨论了所有转化的反应机理。所有化合物均通过IR,1 H和13 C NMR(在某些情况下还包括15 N NMR)光谱以及EI和/或ESI质谱进行表征。确定了化合物3b的X射线结构。