The present invention provides an improved method for preparing a compound of formula (IIIA), which is a varenicline synthesis intermediate. Furthermore, the present invention provides an improved method for preparing varenicline, or a salt or a solvate thereof. Moreover, the present invention provides a process for decolouring varenicline, or a salt or a solvate thereof. Moreover, the present invention provides a process for preparing varenicline L-tartrate, with an improved yield. Moreover, the present invention relates to the use of a compound of formula (V), or a salt or a solvate thereof, as reference marker and reference standard for evaluating the purity of varenicline, or a salt or a solvate thereof.
本发明提供了一种制备式(IIIA)化合物的改进方法,该化合物是一种
伐伦克林合成中间体。此外,本发明还提供了一种制备
伐尼克兰或其盐或溶液的改进方法。此外,本发明还提供了一种脱色
伐伦克林或其盐或溶液的工艺。此外,本发明还提供了一种制备
酒石酸伐伦克林的工艺,其产率有所提高。此外,本发明还涉及将式(V)化合物或其盐或溶液作为参考标记和参考标准,用于评估
伐伦克林或其盐或溶液的纯度。