Synthesis and structural studies of 3,6-disubstituted-bis-1,2,4-triazolo-[4,3-b][3′,4′-f]pyridazines
作者:Ranjana Aggarwal、Mamta、Garima Sumran、Mari Carmen Torralba
DOI:10.1016/j.molstruc.2019.02.082
日期:2019.6
Abstract Synthesis of a series of 3,6-disubstituted-bis-1,2,4-triazolo-[4,3-b][3′,4′-f]pyridazines (4) was accomplished by the oxidative intramolecular cyclization of 6-arylidenehydrazino-3-aryl-1,2,4-triazolo[4,3-b]pyridazine (3) using iodobenzene diacetate (IBD), as a green oxidant, in dichloromethane at room temperature. The compounds 3 and 4 were characterized by IR, NMR (1H and13C), mass spectral
摘要 通过分子内氧化环化合成了一系列 3,6-二取代-双-1,2,4-三唑并-[4,3-b][3',4'-f]哒嗪 (4) 6-亚芳基肼基-3-芳基-1,2,4-三唑并[4,3-b]哒嗪 (3) 使用二乙酸碘苯 (IBD) 作为绿色氧化剂,在二氯甲烷中,室温。化合物3和4通过IR、NMR(1H和13C)、质谱数据和元素分析表征。空间应变的 3,6-二-(2'-氟苯基)-双-1,2,4-三唑并-[4,3-b][3',4'-f]哒嗪 4f 和3,6-di-(4'-fluorophenyl)-bis-1,2,4-triazolo-[4,3-b][3',4'-f]pyridazine 4g 表明哒嗪环具有扭曲的构象,导致非平面三环核。两种化合物都在正交 P212121 空间群中结晶,每个不对称单元包含一个单分子。研究表明,化合物 4f 与相邻分子之间的弱、中心对称 F⋯F 相互作用(距离为 2.882(3)