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.
Phosphonium Ylides In Organic Synthesis III. 12 A Novel Synthesis Of α-Substituted Ylides and Pyrazole Systems
作者:Ayman W. Erian、Nadia R. Mohamed、Hamdi M. Hassaneen
DOI:10.1080/00397919908086132
日期:1999.5
Abstract A novel synthesis of a-substituted phosphoniumylides and pyrazole systems via the treatment of hydrazonoyl halides 1 with phosphoranes 2 and 6, respectively is reported.