schizophrenia. Modification and optimization of the route includes one-pot synthesis of a trans/cis mixture of cyclohexyl ethyl acetate 19, direct crystallization of cyclohexyl acetic acid 21 in trans configuration, avoidance of hazardous reagents to obtain mesylate 24, and a salinization and recrystallization protocol to efficiently remove the olefinic impurity 31 from 12 (free base of 1). Ultimately these improvements
                                    在本文中,我们描述了一种针对
多巴胺D 3相对于D 2受体拮抗剂SI
PI 6398(1)的公斤级制剂的开发,作为精神分裂症的一种新的替代治疗方法。路线的修改和优化包括一锅法合成
环己基乙酸乙酯19的反式/顺式混合物,以反式构型直接结晶
环己基乙酸21,避免使用危险试剂以获得
甲磺酸酯24以及盐化和重结晶方案有效地从12中去除烯烃杂质31(免费基数为1)。最终,这些改进使HPLC纯度> 99.9%的九步成功成功地制备了2.7 kg SI
PI 6398。