28491-58-9Relevant articles and documents
Ethyl 5-amino-3-oxo-1,2-dihydro-1h-pyrazole-1-carboxylate in the selective synthesis of partially hydrogenated pyrazolo[3,4-b]pyridin-3-ones
Lebed,Mozgovaya,Kos,Vovk
, p. 368 - 371 (2012)
Ethyl 5-amino-3-oxo-1,2-dihydro-1H-pyrazole-1-carboxylate undergoes selective cyclocondensation with 1,3-dicarbonyl compounds or their synthetic equivalents to give ethyl 3-oxo-1,2-dihydropyrazolo[3,4-b]pyridine-1- carboxylates which are readily converted
STUDIES IN THE FIELD OF NITROGEN HETEROCYCLIC COMPOUNDS. PART VII. CYCLOCONDENSATION OF ETHYL ACETOACETATE WITH 5-AMINO-3-PYRAZOLONE LEADING TO 5H,8H-1,5a,8a-TRIAZAACENAPHTHYLENE DERIVATIVES - NOVEL NITROGEN BRIDGEHEAD RING SYSTEM
Balicki, Roman
, p. 711 - 718 (2007/10/02)
Cyclocondensation of 5-amino-3-pyrazolone (1) with ethyl acetoacetate (2) carried out in alkaline medium (pH ca. 10) led to formation of several products, depending upon the molar ratio of reagents used.Hitherto unknown ester 6, as well as two isomeric derivatives of novel bridgehead ring system, namely: 5H,8H-1,5a,8a-triazaacenaphthylene (B).The structures of the products result from their spectral data (1H NMR, MS) and some chemical transformations.Pathways of the formation of products are also discussed.