摘要
以2-吡啶甲酸(2)为起始原料,经氯化、酯化一锅法合成高纯度的中间体(4),中间体(4)经酰胺化得到中间体(5),(5)在TBAB和氢氧化钠存在下,与对氨基苯酚亲核取代成醚得到中间体(6);3-三氟甲基-4-氯苯胺(7)和三光气反应,经减压蒸馏纯化得到相应的异氰酸酯(8);(6)与4--氯-3-三氟甲基苯异氰酸酯(8)缩合制得索拉非尼(1).改进后的合成工艺总收率达69.7%,生产成本低,环境友好,操作简单且易于工业化生产.
The intermediate methyl 4-ehloropicolinate (4) is prepared from picolinic acid (2) as a starting material by chloration and esterification. Its amidation afford 4-chloro-N-methylpicolinamide (5) which is converted into key intermediate 4-(4-aminophenoxy)-N-methylpicolinamide (6) by aromatic nucleophilic substitution with 4-amino- phenol. 4-chloro-3- (trifluoromethyl) phenyhsocyanate ( 8 ) is obtained from 4-chloro-3-trifluoromethylanihne ( 7 ) by isocyanation with triphosgene. The synthesis of title compound is completed by the condensation of intermediate (6) with (8). This process has the features of cheap material, simple operation, high yield and green chemistry.
出处
《烟台大学学报(自然科学与工程版)》
CAS
2012年第2期146-149,共4页
Journal of Yantai University(Natural Science and Engineering Edition)