The invention concerns a process for preparing BTG-1640, i.e. rel- (3R*,3aS*,7aS*)-3-benzyl-2-methyl-2,3,3a,4,5,6,7,7a-octahydrobenzo[d]isoxazol- 4-one or a salt thereof, comprising the following steps: d) adding phenylacetaldehyde (4) to N-methylhydroxylamine (5) in the form of a salt in the presence of an organic base selected from the group consisting of tertiary amines NR1 R2R3, where R1, R2, R3 independently from each other represent a C1-C4 alkyl group, alkali or alkaline earth metal (C1-C4)alkoxides, alkali or alkaline earth metal (C1-C4)carboxylates, and in the presence of an anhydrous polar solvent selected from the group consisting of C1-C5 alcohols, formamide, dimethylformamide, dimethylsulphoxide, at a temperature within the range from O°C to 12O°C to provide, after removal of the solvent, a solid mixture of nitrone monomer (3) and dimer (10), wherein the nitrone to dimer ratio is within the range from 90:10 to 0:100; e) reacting the solid mixture obtained in step d), wherein the ratio of the nitrone to dimer is within the range from 90:10 to 0:100, with cyclohexenone (2); f) subjecting the crude reaction product obtained in e), having been optionally evaporated to dryness and retaken in a water-immiscible solvent, to at least one wash with water followed by evaporating the organic phase to dryness; g) separating the BTG-1640 as an oxalate salt (1c) by precipitating with oxalic acid added to the organic phase in the dry state; and h) optionally freeing the BTG-1640 base from the oxalate salt.
该发明涉及一种制备BTG-1640的过程,即rel-(3R*,3aS*,7aS*)-3-苄基-2-甲基-2,3,3a,4,5,6,7,7a-辛氢苯并[d]
异噁唑-4-酮或其盐的方法,包括以下步骤:d)将
苯乙醛(4)加入N-甲基
羟胺(5)的盐形式中,在选择自三级胺NR1R2R3组成的有机碱的存在下,其中R1、R2、R3分别独立地代表C1-C4烷基、碱
金属或碱土
金属(C1-C4)烷氧基、碱
金属或碱土
金属(C1-C4)
羧酸盐,并在选择自C1-C5醇、甲酰胺、二甲基甲酰胺、
二甲基亚砜组成的无
水极性溶剂的存在下,在温度范围从0°C到120°C提供,去除溶剂后,得到一种亚硝基酮单体(3)和二聚体(10)的固体混合物,其中亚硝基酮与二聚体的比例在90:10到0:100的范围内;e)将步骤d)中得到的固体混合物,其中亚硝基酮与二聚体的比例在90:10到0:100的范围内,与
环己酮(2)反应;f)将步骤e)中得到的粗反应产物,经干燥蒸发和重新溶解于不溶于
水的溶剂中,至少用
水洗涤一次,然后将有机相干燥蒸发至干燥;g)通过在干燥状态下向有机相中加入
草酸沉淀BTG-1640作为
草酸盐(1c);h)可选择性地从
草酸盐中释放BTG-1640碱。