The present invention provides a method for synthesizing Milbemycin oxime. The method comprises the following steps. (1) Oxidizing reaction: oxidizing Milbemycin, using hypochlorite or chlorite as oxidizers and piperidine nitrogen oxygen free radicals as the catalyst and halide as the catalyst promoter. The oxidation reaction is conducted in a dichloromethane solvent for 0.5-4 hours at −5-15° C. to produce the intermediate product Milbemycin ketone. (2) Oximation reaction: reacting the Milbemycin ketone with a hydroxylamine hydrochloride oximation agent in a 1,4-dioxane reaction solvent for 10-16 hours at 25-35° C. to obtain Milbemycin oxime. The method provided by the present invention realized the industrial production of Milbemycin oxime for the first time domestically. Moreover, the yield of the prepared product is higher than competing products both at home and abroad.
本发明提供了一种合成氧羟基妙巴蟛的方法。该方法包括以下步骤。 (1)氧化反应:氧化妙巴蟛,使用
次氯酸盐或
氯酸盐作为氧化剂,
吡啶氮氧自由基作为催化剂和卤化物作为催化剂助剂。在
二氯甲烷溶剂中,将氧化反应在-5至15°C下进行0.5-4小时,以生成中间产物妙巴蟛酮。 (2)氧化胺反应:将妙巴蟛酮与
羟胺盐酸盐氧化剂在
1,4-二氧六环反应溶剂中反应10-16小时,在25-35°C下获得氧羟基妙巴蟛。本发明提供的方法首次在国内实现了氧羟基妙巴蟛的工业生产。此外,所制备产品的产率高于国内外竞争产品。