Benzo[h]thiazolo[2,3-b]quinazolines by an efficient p-toluenesulfonic acid-catalyzed one-pot two-step tandem reaction
作者:B. Sakram、B. Sonyanaik、K. Ashok、S. Rambabu、S. K. Johnmiya
DOI:10.1007/s11164-015-2112-4
日期:2016.3
A highly efficient method has been developed for synthesis of 7,9-disubstituted-6,7-dihydro-5H-benzo[h]thiazolo[2,3-b]quinazolines via multicomponent one-pot two-step tandem reaction involving 1-tetralone, arylaldehydes, thiourea, and 4-chlorophenacyl bromide/(3-bromoacetyl)coumarin utilizing p-toluenesulfonic acid as catalyst in glacial acetic acid under reflux conditions. Analytically pure products are formed with excellent yield and short reaction time. All the synthesized compounds were confirmed by their spectral and elemental analyses.
一种高效的方法被开发用于合成7,9-二取代的6,7-二氢-5H-苯并[h]噻唑[2,3-b]喹唑啉,通过多组分一锅法两步串联反应,涉及1-四氢萘酮、芳基醛、硫脲和4-氯苯乙酰溴/(3-溴乙酰)香豆素,采用对甲苯磺酸作为催化剂,在冰醋酸下回流条件进行。通过这种方法形成的产品具有优良的纯度和高产率,同时反应时间短。所有合成化合物均通过光谱和元素分析进行了确认。