Derivatives of arylhydrazonic acids. Part 2: A facile approach to novel 4,5-dihydro-1H-1,2,4-triazoles via cyclization of amidrazones
摘要:
Starting from arylhydrazonoyl chlorides, the amide arylhydrazones (amidrazones) were obtained by nucleophilic substitution of the chloride function with ammonia, amines or anilines. Treatment of amidrazones with alkyl ketones under acidic catalysis led generally to 4,5-dihydro-1H-1,2,4-triazoles. In addition, with aldehydes 1H-1,2,4-triazoles or aryl condensed 4,5-dihydro-1H-1,3,4-triazepines were formed depending on substitution pattern of amidrazone moiety. The structures of the new products have been established by H-1 and C-13 NMR studies. (C) 2002 Elsevier Science Ltd. All rights reserved.
HETEROCYCLIC SYNTHESIS USING NITRILIMINES: PART 3(1). SYNTHESIS OF SUBSTITUTED 1,2,4,5-TETRAZINES AND 1,2,4,5-TETRAAZA-2-PENTENES
作者:Hany M. Dalloul、Peter H. Boyle
DOI:10.1515/hc.2003.9.5.507
日期:2003.1
The reaction of nitrilimines 2a.b with hydrazones of aliphatic ketones 3 (RHNN=CR'R) led to the formation of the cyclocondensation products 1,2,4,5-tetrazines 4a-g when R = CH3, and to acyclic electrophilic addition products 5a-g when R = H, rather than the cyclocondensation tetrazines products 8.
当 R = CH3 时,腈亚胺 2a.b 与脂肪族酮 3 腙 (RHNN=CR'R) 的反应导致环缩合产物 1,2,4,5-四嗪 4a-g 的形成,以及非环状亲电加成当 R = H 时产物 5a-g,而不是环缩合四嗪产物 8。
Buelow; King, Justus Liebigs Annalen der Chemie, 1924, vol. 439, p. 212
作者:Buelow、King
DOI:——
日期:——
Shawali, Ahmed S.; Hassaneen, Hamdi M.; Fahmy, Abdelgawad A., Phosphorus, Sulfur and Silicon and the Related Elements, 1990, vol. 53, # 1-4, p. 259 - 265
作者:Shawali, Ahmed S.、Hassaneen, Hamdi M.、Fahmy, Abdelgawad A.、Abunada, Nada M.、Mousa, Hiyam A. H.
DOI:——
日期:——
SHAWALI, AHMAD S.;HASSANEEN, HAMDI M.;FAHMY, ABDELGAWAD A.;ABUNADA, NADA +, PHOSPH., SULFUR AND SILICON AND RELAT. ELEM., 53,(1990) N-4, C. 259-265
作者:SHAWALI, AHMAD S.、HASSANEEN, HAMDI M.、FAHMY, ABDELGAWAD A.、ABUNADA, NADA +
DOI:——
日期:——
Lipoxygenase-Inhibitoren, 4. Mitt.: Synthese und Cyclisierungsreaktionen offenkettigerN1-arylsubstituierter Amidrazone
Ausgehend von α‐Carbonylcarbonsäurearylhydrazonochloriden, die durch Japp‐Klingemann‐Spaltung erhalten werden, werden α‐Carbonylcarbonsäurearylhydrazonoamide,‐ester sowie ‐thioester synthetisiert, deren inhibitorische Wirkung gegenüber 15‐ bzw. 5‐Lipoxygenase beschrieben wird. Umsetzungen der Amidrazonderivate mit Formaldehyd führen zu Triazol‐,Triazolin‐ und in unerwarteter Weise zu Benzotriazepinderivaten