(−)-4-Hydroxy-N-formylmorphinan-6-one (4) was prepared in 70% overall yield from ketone 1, via carbamate 2, and N-formylation of ketone 3. Bromination of 4 afforded either the 6-ketomorphinan 7 or the ketone 8, depending on the reaction conditions applied. Both bromo ketones 7 and 8 could be converted by standard reactions into 4,5-epoxy-N-methylmorphinan-6-one (1). The ketomorphinan 4 emerges from these investigations as a versatile intermediate, well suited for the synthesis of 4-hydroxymorphinans and 3-deoxyopioids.
(-)-4-羟基-N-甲酰吗啡酮-6-酮(4)从酮1通过碳酸酯2和酮3的N-甲酰化反应,总产率为70%制备而成。4的溴化反应产物可以得到6-酮吗啡酮7或酮8,具体取决于所采用的反应条件。两种溴化酮7和8均可通过标准反应转化为4,5-环氧-N-甲基吗啡酮-6-酮(1)。这些研究表明,酮吗啡酮4是一种多功能中间体,非常适合用于合成4-羟基吗啡酮和3-去氧阿片类药物。