In this work, a novel N-bromo sulfonamide reagent, namely N,2-dibromo-6-chloro-3,4-dihydro-2H-benzo[e][1,2,4]thiadiazine-7-sulfonamide 1,1-dioxide (DCDBTSD), is synthesized and fully characterized by IR, UV, 1H and 13C NMR, XRD, TG/DTG as well as mass spectra. The presented N-bromo sulfonamide is used as a new and highly efficient catalyst for the synthesis of 4,4â²-(arylmethylene)-bis(3-methyl-1-phenyl-1H-pyrazol-5-ol)s via one-pot pseudo five component condensation reaction of phenylhydrazine, acetoacetate derivatives and arylaldehydes. Mechanistically, Br+ ions, which are generated by the catalyst, can catalyze this reaction in neutral media. This methodology offers several advantages, such as use of non-toxic and inexpensive materials, high yields, short reaction times and clean workup.
本研究合成了一种新型 N-
溴磺酰胺试剂,即 N,2-二
溴-6-
氯-3,4-二氢-2H-苯并[e][1,2,4]噻二嗪-7-磺酰胺 1,1-二氧化物(
DCDBT
SD),并通过红外光谱、紫外光谱、1H 和 13C NMR、XRD、TG/DTG 以及质谱对其进行了全面表征。所提出的 N-
溴磺酰胺被用作一种新型高效催化剂,通过苯
肼、
乙酰乙酸衍
生物和芳基醛的单锅伪五组分缩合反应合成 4,4â²-(芳基亚甲基)-双(
3-甲基-1-苯基-1H-吡唑-5-醇)。从机理上讲,催化剂产生的 Br+ 离子可在中性介质中催化这一反应。这种方法具有多种优势,如使用无毒、廉价的材料,产率高、反应时间短和操作简便。