So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Glushkov, Vladimir A.; Babentsev, Dmitry N.; Dmitriev, Maksim V.; Stepanova, Kseniya A.; Kharintseva, Anastasiya Yu.; Simakhina, Anastasiya E. researched the compound: 2-Furoic hydrazide( cas:3326-71-4 ).Product Details of 3326-71-4.They published the article 《The synthesis of 3-(het)aryl-6,7-dihydro-5H-[1,2,4]-triazolo[3,4-a][2]benzazepines》 about this compound( cas:3326-71-4 ) in Chemistry of Heterocyclic Compounds (New York, NY, United States). Keywords: aryldihydrotriazolobenzazepine preparation; benzazepine hydrazide cyclization. We’ll tell you more about this compound (cas:3326-71-4).
4-Aryl-2-methylbutan-2-ols with methoxy or methylenedioxy substituents participate in the Graf-Ritter reaction with Me thiocyanate in the presence of an acid (H2SO4, MeSO3H) forming 1-methylsulfanyl-2-benzazepines in low yields (11-35%), which underwent cyclization with benzhydrazide or hetarenecarboxylic acid hydrazides upon reflux in o-dichlorobenzene into the corresponding 3-phenyl- and 3-hetaryl-6,7-dihydro-5H-1,2,4-triazolo[3,4-a][2]benzazepines I (R1 = R2 = OMe, R1+R2 = OCH2O; R3 = H, OMe; R4 = Ph, 2-furyl, 2-thienyl, 4-pyridyl) (45-74% yields).
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Reference:
Benzisoxazole – Wikipedia,
Benzisoxazole – an overview | ScienceDirect Topics