Synthetic Protocol toward Fused Pyrazolone Derivatives via a Michael Addition and Reductive Ring Closing Strategy
作者:Nikita Parekh、Joice Thomas、Jubi John、Radhika Kusurkar、Wim M. De Borggraeve、Wim Dehaen
DOI:10.1021/jo5005795
日期:2014.6.6
A new class of pyrazolo[3,4-c]pyridine-3,7-dione and pyrazolo[3,4-d]azepine-3,7-dione scaffolds was synthesized via a Michael addition and reductive cyclization strategy. These fused heterocycles were accessed from simple starting materials such as nitroolefins and 3-ethoxycarbonyl(methylene)pyrazoline-5-one. The pyrazolo-fused heterocycles were obtained in good overall yields.
通过迈克尔加成和还原环化策略合成了一类新型的吡唑并[3,4- c ]吡啶-3,7-二酮和吡唑并[3,4- d ]氮杂3,7-二酮骨架。这些稠合的杂环是从简单的起始原料,例如硝基烯烃和3-乙氧基羰基(亚甲基)吡唑啉-5-酮获得的。以良好的总收率获得了吡唑并稠合的杂环。