Bio-based triacetic acid lactone in the synthesis of azaheterocycles<i>via</i>a ring-opening transformation
作者:Dmitrii L. Obydennov、Asmaa I. El-Tantawy、Vyacheslav Ya. Sosnovskikh
DOI:10.1039/c8nj01044g
日期:——
These polyfunctional compounds have been converted into biologically important pyridone-3-carboxamides (91–99%) with dimethylformamide dimethyl acetal and also react regioselectively with hydrazines and hydroxylamine to form pyrazolyl- (72–96%) and (isoxazolinyl)acetoamides (60–91%). The conversion of TAL into hetarylacetic acid amides can be performed as one-pot reactions without isolation of polycarbonyl
在本文中,已经发现了一种新的将生物基三乙酸内酯(TAL)转化为氮杂环化合物的方法,例如4-吡啶酮,吡唑,异恶唑啉和异恶唑。主要策略涉及将TAL转化为反应性和多功能聚羰基中间体,这些中间体可作为C-6构建有机化合物的基础材料。TAL在无溶剂条件下或在EtOH中与脂肪族和芳香族胺(包括可生物利用的胺)进行开环转化,得到氨基甲酰化的烯胺酮(40-98%)。这些多官能化合物已与二甲基甲酰胺二甲基乙缩醛转变为生物学上重要的吡啶酮-3-甲酰胺(91–99%),并且还与肼和羟胺发生区域选择性反应,形成吡唑基-(72-96%)和(异恶唑啉基)乙酰胺(60- 91%)。TAL转化为仲乳酸酰胺可以一锅法进行,而无需分离多羰基中间体。