Green Synthesis of 3-(2-(4-(6-Fluorobenzo[d]isoxazol-3-yl)piperidin-yl) ethyl-6,7,8,9-tetrahydro-9-hydroxy-2-methylpyridol[1,2-a]pyrimidin-4-one
作者:D. Vivekananda Reddy、P. Sreelatha、P.K. Dubey、B. Rama Devi
DOI:10.14233/ajchem.2014.15910
日期:——
Paliperidone has been synthesized in high yields by condensation of 3-(2-chloroethyl)-9-hydroxy-2-methyl-6,7,8,9-tetrahy-dropyridol[1,2a]pyrimidin-4-one (1) and (2,4-difluoro-phenyl)-piperidin-4-yl-methanone oxime (2) using K2CO3 as a base, refluxing in acetonitrile for 16 h. The novel intermediate (3) underwent internal cyclization in PEG-600 as solvent yielded paliperidone (4). Paliperidone (4) from novel intermediate (3) has also been prepared under microwave condition using PEG-600 and also in presence of a base KOH in toluene at 70 °C for 3 h in higher yields.
帕利哌酮通过将3-(2-氯乙基)-9-羟基-2-甲基-6,7,8,9-四氢吡啶[1,2a]嘧啶-4-酮(1)与(2,4-二氟苯)-哌啶-4-基-甲酰胺肟(2)在K2CO3的催化下以丙腈回流16小时合成,并获得了高产率。新中间体(3)在PEG-600作为溶剂的条件下发生内部环化,生成帕利哌酮(4)。新中间体(3)也可以在微波条件下使用PEG-600以及在存在碱KOH的条件下,在70°C下于甲苯中反应3小时,获得更高的产率来制备帕利哌酮(4)。