Reaction of 2-methoxy-1,3,2-dioxaphosphorino[4,5-b]pyridin-4(4H)-one with hexafluoroacetone
作者:V. F. Mironov、L. M. Burnaeva、I. A. Litvinov、Yu. Yu. Kotorova、A. B Dobrynin、R. Z. Musin、I. V. Konovalova
DOI:10.1007/s11172-005-0021-1
日期:2004.8
The reaction of the di-O-trimethylsilyl derivative of 2-hydroxynicotinic acid with methyl phosphodichloridite afforded 2-methoxy-1,3,2-dioxaphosphorino[4,5-b]pyridin-4(4H )-one. The NMR spectrkscopic data suggest that the reaction of the latter with hexafluoroacetone produces unstable 2-methoxy-2,5-dioxo-4,4-bis(trifluoromethyl)-4,5-dihydro-1,3,2-dioxaphosphepino[4,5-b]pyridine, which is readily transformed into 9-methyl-2,5-dioxo-4,4- bis(trifluoromethyl)-4,5-dihydro-1,3,2-dioxaphosphepino[4,5-b]pyrid-9-inium-2-oate. The structure of the hydrolysis product of the latter, viz., 1-methyl-3-(2-hydroxy-3,3,3-trifluoro-2- trifluoromethylpropanoyl)pyridin-2-one, was established by X-ray diffraction analysis.
2-hydroxynicotinic acid 的二-O-三甲基硅烷衍生物与甲基二氯亚磷酸反应生成 2-甲氧基-1,3,2-二氧磷并[4,5-b]吡啶-4(4H )-酮。核磁共振光谱数据表明,后者与六氟丙酮反应生成不稳定的 2-甲氧基-2,5-二氧代-4,4-双(三氟甲基)-4,5-二氢-1,3,2-二氧磷杂菲啶-4(4H)-酮、2,5-二氧代-4,4-双(三氟甲基)-4,5-二氢-1,3,2-二氧磷杂菲并[4,5-b]吡啶很容易转化为 9-甲基-2,5-二氧代-4,4-双(三氟甲基)-4,5-二氢-1,3,2-二氧磷杂菲并[4,5-b]吡啶-9-鎓-2-油酸酯。通过 X 射线衍射分析,确定了后者的水解产物,即 1-甲基-3-(2-羟基-3,3,3-三氟-2-三氟甲基丙酰基)吡啶-2-酮的结构。