Ultrasound irradiation promotes the synthesis of new 1,2,4-triazolo[1,5-a]pyrimidine
                                
                                    
                                        作者:Clarissa P. Frizzo、Elisandra Scapin、Mara R.B. Marzari、Taiana S. München、Nilo Zanatta、Helio G. Bonacorso、Lilian Buriol、Marcos A.P. Martins                                    
                                    
                                        DOI:10.1016/j.ultsonch.2013.12.007
                                    
                                    
                                        日期:2014.5
                                    
                                    Ultrasonic irradiation was used in the synthesis of a series of novel 1,2,4-triazolo[1,5-a]pyrimidines. The products were synthetized from the cyclocondensation reaction of 1,1,1-trifluoro-4-metoxy-3-alken-2-one [CF3C(O)CHC(R)OMe, where R=Ph, 4-F-C6H4, 4-Br-C6H4, 4-I-C6H4, 4-CH3-C6H4, 4-CH3O-C6H4, Thien-2-yl, Biphen-4-yl] or β-enaminones [RC(O)CHCHNMe2, where R=Ph, 4-F-C6H4, 4-Br-C6H4, 4-I-C6H4, 4-CH3-C6H4
                                    超声辐射用于合成一系列新型的
1,2,4-三唑并[1,5-a]
嘧啶。产物是由1,1,1-三
氟-4-甲氧基-3-烯烃-2-酮[CF3C(O)CHC(R)OMe的环缩合反应合成的,其中R = Ph,4-F-
C6H4, 4-Br-    、4-I-    、4-
CH3-    、4-   O-    ,
噻吩-2-基,
联苯-4-基]或β-烯酮[RC(O)CHCHNMe2,其中R = Ph,4-F-    ,4-Br-    ,4-I-    ,4-   -    ,4-   O-    ,4-
NO2-    ,
噻吩-2-基,
联苯-4-基,
萘-2-基,
吡咯-2-基,CCl3]与
乙酸中的5-
氨基-
1,2,4-三唑在99°C的条件下进行5-17分钟的超声波照射。与传统的热加热(油浴)相比,该方法具有许多优势,例如反应时间短,条件温和,区域选择性高,产率高。