Identification, isolation, synthesis and characterization of impurities of quetiapine fumarate
作者:Bharathi、Prabahar、Prasad、Srinivasa Rao、Trinadhachary、Handa、Dandala, Ramesh、Naidu
DOI:10.1691/ph.2008.7174
日期:——
In the process for the preparation of quetiapine fumarate (1), six unknown impurities and one known impurity (intermediate) were identified ranging from 0.05–0.15% by reverse-phase HPLC. These impurities were isolated from crude samples using reverse-phase preparative HPLC. Based on the spectral data, the impurities were characterized as 2-[4-dibenzo[b,f][1,4]thiazepine-11-yl-1-piperazinyl]1-2-ethanol (impurity I, desethanol quetiapine), 11-[(N-formyl)-1-piperazinyl]-dibenzo[b,f][1,4]thiazepine (impurity II, N-formyl piperazinyl thiazepine), 2-(2-hydroxy ethoxy)ethyl-2-[2-[4-dibenzo[b,f][1,4]thiazepine-11-piperazinyl-1-carboxylate (impurity III, quetiapine carboxylate), 11-[4-ethyl-1-piperazinyl]dibenzo [b,f][1,4] thiazepine (impurity IV, ethylpiperazinyl thiazepine), 2-[2-(4-dibenzo[b,f][1,4]thiazepin-11-yl-1-piperazinyl)ethoxy]1-ethyl ethanol [impurity V, ethyl quetiapine), 1,4-bis[dibenzo[b,f][1,4]thiazepine-11-yl] piperazine [impurity VI, bis(dibenzo)piperazine]. The known impurity was an intermediate, 11-piperazinyl-dibenzo [b,f][1,4]thiazepine (piperazinyl thiazepine). The structures were established unambiguously by independent synthesis and co-injection in HPLC to confirm the retention times. To the best of our knowledge, these impurities have not been reported before. Structural elucidation of all impurities by spectral data (1H NMR, 13C NMR, MS and IR), synthesis and formation of these impurities are discussed in detail.
在富马酸喹硫平(1)的制备过程中,通过反相高效液相色谱法发现了六种未知杂质和一种已知杂质(中间体),含量范围为 0.05-0.15%。使用反相制备高效液相色谱法从粗样品中分离出了这些杂质。根据光谱数据,这些杂质被鉴定为 2-[4-二苯并[b,f][1,4]硫氮杂卓-11-基-1-哌嗪基]1-2-乙醇(杂质 I,去乙醇喹硫平)、11-[(N-formyl)-1-哌嗪基]-二苯并[b、f][1,4]硫氮杂卓(杂质 II,N-甲酰基哌嗪基硫氮杂卓)、2-(2-羟基乙氧基)乙基-2-[2-[4-二苯并[b,f][1,4]硫氮杂卓-11-哌嗪基-1-甲酸酯(杂质 III、喹硫平羧酸盐)、11-[4-乙基-1-哌嗪基]二苯并[b,f][1,4]硫氮杂卓(杂质 IV,乙基哌嗪基硫氮杂卓)、2-[2-(4-二苯并[b,f][1、2-[2-(4-二苯并[b,f][1,4]硫氮杂卓-11-基-1-哌嗪基)乙氧基]1-乙基乙醇[杂质 V,乙基喹硫平]、1,4-双[二苯并[b,f][1,4]硫氮杂卓-11-基]哌嗪[杂质 VI,双(二苯并)哌嗪]。已知杂质是一种中间体,即 11-哌嗪基二苯并[b,f][1,4]硫氮杂卓(哌嗪基硫氮杂卓)。通过独立合成和在高效液相色谱中共同进样确认保留时间,这些化合物的结构得以明确确定。据我们所知,这些杂质以前从未报道过。本文详细讨论了通过光谱数据(1H NMR、13C NMR、MS 和 IR)阐明所有杂质的结构、这些杂质的合成和形成。