Synthesis of new fluorine-containing pyrazolo[3,4-b]pyridinones as promising drug precursors
作者:A. S. Golubev、G. S. Starostin、K. S. Chunikhin、A. S. Peregudov、K. C. Rodygin、S. A. Rubtsova、P. A. Slepukhin、A. V. Kuchin、N. D. Chkanikov
DOI:10.1007/s11172-011-0114-y
日期:2011.4
Methods for the synthesis of 4-R-6,7-dihydro-1H-pyrazolo[3,4-b]pyridin-6-ones (R = CF2SAr and 4-CFHSAr) were developed. The derivatives with R = CF2SAr were obtained by both heterocyclization of 1-substituted 5-aminopyrazoles with ethyl 4,4-difluoro-3-oxo-4-phenylsulfanylbutanoate and replacement of the Br atom in 4-bromodifluoromethyl-6,7-dihydro-1H-pyrazolo[3,4-b]pyridin-6-ones by sodium arenethiolates. The fragment 4-CF-HSAr was introduced by replacement of the Cl atom in 4-chlorofluoromethyl-6,7-dihydro-1H-pyrazolo[3,4-b]pyridin-6-ones by sodium arenethiolates. Oxidation of 4-CF2SPh-6,7-dihydro-1H-pyrazolo[3,4-b]pyridin-6-ones gave the corresponding sulfoxides; their structures were confirmed by X-ray diffraction data.
开发了 4-R-6,7-二氢-1H-吡唑并[3,4-b]吡啶-6-酮(R = CF2SAr 和 4-CFHSAr)的合成方法。 R=CF2SAr的衍生物是通过1-取代的5-氨基吡唑与4,4-二氟-3-氧代-4-苯硫基丁酸乙酯的杂环化和4-溴二氟甲基-6,7-二氢-中的Br原子取代得到的。由芳烃硫醇钠生成 1H-吡唑并[3,4-b]吡啶-6-酮。通过用芳硫醇钠取代 4-氯氟甲基-6,7-二氢-1H-吡唑并[3,4-b]吡啶-6-酮中的 Cl 原子引入片段 4-CF-HSAr。 4-CF2SPh-6,7-二氢-1H-吡唑并[3,4-b]吡啶-6-酮的氧化得到相应的亚砜;它们的结构通过X射线衍射数据得到证实。