Synthesis and antitubercular evaluation of amidoalkyl dibenzofuranols and 1H-benzo[2,3]benzofuro[4,5-e][1,3]oxazin-3(2H)-ones
作者:Srinivas Kantevari、Thirumal Yempala、Perumal Yogeeswari、Dharmarajan Sriram、Balasubramanian Sridhar
DOI:10.1016/j.bmcl.2011.05.054
日期:2011.7
3]oxazin-3(2H)-ones was synthesized in very good yields through polyphosphoric acid supported on silica (PPA–SiO2) catalyzed one-pot three component condensation of 2-dibenzofuranol; aromatic aldehydes and acetamide or benzamide or urea under solvent free conditions. At 125 °C the reaction led to the formation of amidoalkyl dibenzofuranols 5a–k where as at 160 °C cyclization take place to give oxazin-3(2H)-one
通过负载在二氧化硅上的多磷酸合成了一种新型的酰胺基烷基二苯并呋喃醇和1 H-苯并[2,3]苯并呋喃[4,5- e ] [1,3]恶嗪-3(2 H)-一。 (PPA–SiO 2)催化2-二苯并呋喃醇的一锅三组分缩合反应;无溶剂条件下的芳族醛和乙酰胺或苯甲酰胺或尿素。在125°C时,该反应导致形成酰胺烷基二苯并呋喃醇5a – k,在160°C时发生环化反应,生成oxazin-3(2 H)-one的类似物6a – e。筛选所有16种化合物的体外抗分枝杆菌活性结核分枝杆菌H37Rv(MTB)产生1-((4-氯苯基)(2-羟基二苯并[ b,d ]呋喃基)甲基)脲5h ; 1-((4-溴苯基)(2-羟基二苯并[ b,d ]呋喃基)甲基)脲5i ; 1-苯基-1 H-苯并[2,3]苯并呋喃[4,5- e ] [1,3]恶嗪-3(2 H)-a 6a(MIC 3.13μg / mL)和1-(4-氯苯基)-1-