Novel synthetic protocol toward pyrazolo[3,4-h]-[1,6]naphthyridines via Friedlander condensation of new 4-aminopyrazolo[3,4-b]pyridine-5-carbaldehyde with reactive α-methylene ketones
作者:Madhukar N. Jachak、Sandeep M. Bagul、Muddassar A. Kazi、Raghunath B. Toche
DOI:10.1002/jhet.242
日期:2011.3
Novel pyrazolo[3,4‐h][1,6]naphthyridine derivatives 6, 8, 9, 11, 13, and 15 have been synthesized by Friedlander condensation of new 4‐amino‐3‐methyl‐1‐phenyl‐1H‐pyrazolo[3,4‐b]pyridine‐5‐carbaldehyde (o‐aminoaldehyde) 4 with active methylene ketones, such as symmetric acetone 5a, monoalkylketones 5b, 5c, 5d, 5e, 5f, 5g, 5h, 5i, 5j, 5k, unsymmetrical dialkyl ketones 7a, 7b, p‐bromophenylacetonitrile
新型吡唑并[3,4 ħ ] [1,6]二氮杂萘衍生物6,8,9,11,13,和15已经被新的4-氨基-3-甲基-1-苯基-1-弗里德兰德缩合合成ħ带有活性亚甲基酮(例如对称丙酮5a),单烷基酮5b,5c,5d,5e,5f,5g,5h,5i的-pyrazolo [3,4- b ]吡啶-5-甲醛(邻氨基醛)4,5J,5K,非对称的二烷基酮7A,7B,p -bromophenylacetonitrile 10,β酮酯12a中,β酮酰胺12b中,或丙二酸二乙酯14分别。J.杂环化学。(2011)。