Knoevenagel condensation of cyclic ketones with benzoylacetonitrile and N,N′-dimethylbarbituric acid. Application of sterically hindered condensation products in the synthesis of spiro and dispiropyrans by hetero-Diels–Alder reactions
作者:Aleksandra Pałasz、Tadeusz Pałasz
DOI:10.1016/j.tet.2010.12.053
日期:2011.2
Inverse-electron demand Diels–Alder cycloadditions of sterically hindered cycloalkylidene derivatives of benzoylacetonitrile and N,N′-dimethylbarbituric acid with enol ethers, cyclic enol ethers and also sterically hindered cycloalkylidenecycloalkanes were investigated. New spiro, dispirodihydropyrans, spirouracils, and dispirouracils were obtained. To confirm the experimental results, frontier orbital
研究了位阻逆的苯甲酰基乙腈和N,N'-二甲基巴比妥酸的位阻环亚烷基衍生物与烯醇醚,环状烯醇醚以及位阻受阻的亚烷基环烷烃的Diels-Alder环加成反应。获得了新的螺,双螺二氢吡喃,螺旋藻和双螺菌。为了证实实验结果,通过半经验AM1,PM3方法和从头算Hartree-Fock计算,计算了异二烯和双亲物的前沿轨道HOMO和LUMO能量。