Aminolysis of 2,2-difluoro-4-alkoxy-1,3,2-dioxaborinanes: route to β-keto amides and β-enamino carboxamides
作者:Bogdan Štefane、Slovenko Polanc
DOI:10.1016/j.tet.2007.08.085
日期:2007.11
4-Alkoxy substituted 1,3,2-dioxaborinanes 1, readily available from β-keto esters, undergo substitution reactions under mild reaction conditions with primary and secondary amines, deriving the 4-alkylamino analogue 2. Reactions of 1 with substituted phenylhydrazines gave the corresponding hydrazones, or pyrazolones, and 5-alkoxy-1H-pyrazoles as a mixture of products.
4-烷氧基取代的1,3,2-二氧杂硼烷酮1易得自β-酮酯,在温和的反应条件下与伯胺和仲胺进行取代反应,得到4-烷基氨基类似物2。1与取代的苯肼的反应得到相应的或吡唑啉酮,以及作为产物混合物的5-烷氧基-1 H-吡唑。