2019
DOI: 10.1007/s10593-019-02468-8
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N-Boc-4-aminopyrazole-5-carbaldehydes in Friendländer synthesis of pyrazolo[4,3-b]pyridines

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Cited by 9 publications
(3 citation statements)
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“… Methods for the synthesis of pyrazolo [4,3- b ]pyridines: ( A ) annulation of a pyridine fragment to an amino substituted pyrazole ring [ 14 , 15 , 16 , 17 , 18 , 19 , 20 ]; ( B ) annulation of a pyrazole ring to functionalized pyridine core [ 22 ]; ( C ) synthesis from available 3-nitropyridines. …”
Section: Figures and Schemesmentioning
confidence: 99%
See 1 more Smart Citation
“… Methods for the synthesis of pyrazolo [4,3- b ]pyridines: ( A ) annulation of a pyridine fragment to an amino substituted pyrazole ring [ 14 , 15 , 16 , 17 , 18 , 19 , 20 ]; ( B ) annulation of a pyrazole ring to functionalized pyridine core [ 22 ]; ( C ) synthesis from available 3-nitropyridines. …”
Section: Figures and Schemesmentioning
confidence: 99%
“…Methods for the synthesis of pyrazolo [4,3- b ]pyridines are usually based on the annulation of a pyridine fragment to an amino-substituted pyrazole ring, Scheme 1 A. Two main approaches include cyclocondensation of unstable 4-aminopyrazole-5-carbaldehydes in their N-protected forms [ 14 , 15 , 16 ], as well as cyclization of 5-functionalized 4-aminopyrazoles [ 17 ]. Another example deals with cyclization of 4-amino-5-(indol-3-yl)pyrazole with aldehydes [ 18 , 19 ] or sodium nitromalonodialdehyde [ 20 ].…”
Section: Introductionmentioning
confidence: 99%
“…Автори праці [10] описали синтез 2-аміноімідазо [4,5-b]тієно [2,3-е]піридину реакцією Фрідлендера 3-аміно-5-метил-2-тіофенкарбальдегіду із креатиніном (2-аміно-1-метил-5Н-імідазол-4-он) у присутності N,O-біс(триметилсиліл)ацетаміду (BSA) як розчинника та конденсувального реагенту. З метою отримання їх піразоловмісних аналогів видавалося доцільним апро-бувати в подібній конденсації із креатиніном раніше синтезовані нами N-Bос-4-амінопіразол-5карбальдегіди 1a -d [41].…”
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