The present invention relates to a process for the reduction of a 6-keto group in a morphinan alkaloid to the corresponding 6-hydroxy group, comprising hydrogenating the 6-keto group using gaseous hydrogen in the presence of a heterogeneous catalyst and a solvent, to yield the 6-hydroxy morphinan alkaloid, wherein the reduction is carried out at a pH in the range of about 5 to about 7, and the 6-hydroxy morphinan alkaloid has an α:β ratio of > 85: 15.
本发明涉及一种将
吗啡类
生物碱中的6-酮基还原为相应的6-羟基的方法,包括在存在异质催化剂和溶剂的情况下,使用气态氢对6-酮基进行加氢处理,得到6-羟基
吗啡类
生物碱,其中还原在约5至约7的pH范围内进行,而6-羟基
吗啡类
生物碱的α:β比率为> 85:15。