An efficient and regioselective synthesis of 1,1′-oxalylbis[3-(alkyl/aryl/heteroaryl)-5-(trihalomethyl)-1H-pyrazoles] from 4-alkoxy-1,1,1-trihaloalk-3-en-2-ones
作者:Helio G. Bonacorso、Cleber A. Cechinel、Jussara Navarini、Rosália Andrighetto、Marcos A. P. Martins、Nilo Zanatta
DOI:10.1007/s00706-011-0455-0
日期:2011.3
AbstractThis work describes the regioselective synthesis of two new series of 1,1′-oxalylbis[3-(alkyl/aryl/heteroaryl)-4,5-dihydro-5-hydroxy-5-(trihalomethyl)-1H-pyrazoles], where the 3-substituents are H, Me, C6H5, 4-FC6H4, 4-ClC6H4, 4-BrC6H4, 4-NO2C6H4, 4,4′-BiPh, and 2-furyl, in a one-pot methodology with ethanol as solvent, from the reaction of 4-alkoxy-4-(alkyl/aryl/heteroaryl)-1,1,1-trihaloalk-3-en-2-ones
摘要这项工作描述了两个新的1,1'-草酰双[3-(烷基/芳基/杂芳基)-4,5-二氢-5-羟基-5-(三卤甲基)-1 H-吡唑]系列的区域选择性合成,其中3-取代基是H,我,C 6 H ^ 5,4-FC 6 H ^ 4,4-CLC 6 ħ 4,4- BRC 6 ħ 4,4-NO 2 C ^ 6 ħ 4一锅法中,以乙醇为溶剂,由4-烷氧基-4-(烷基/芳基/杂芳基)-1,1,1-三卤代烷基- 3-en-2-ones与草酰二酰肼(51–89%)。作为补充,还报道了五个所述的草酰双吡唑啉的脱水反应,它们在53中提供了各自的1,1'-草酰双[3-(烷基/芳基/杂芳基)-5-(三卤甲基)-1 H-吡唑]没有两次C(O)-N键裂解的情况下,产率为–78%。 图形概要 。