The Ullmann reaction of β-tetrahydrodesoxycodeine and the successive sodium—liquid ammonia reduction gave (−)-3-methoxy-N-methylisomorphinan in excellent yield. Similar reduction of the ketal of β-dihydrothebainone phenyl ether followed by the hydrolysis gave the desired (−)-3-methoxy-6-oxo-N-methylisomorphinan, whereas a similar sequence of reactions with β-thebainone-A phenyl ether gave (−)-3-me
β-四氢脱氧
可待因的Ullmann反应和连续的
钠-液
氨还原反应以极好的收率得到(-)-3-甲氧基-N-甲基异
吗啡喃。β-二氢
噻吩酮苯基醚的
缩酮的相似还原反应,然后进行
水解得到所需的(-)-3-甲氧基-6-氧代-N-甲基异
吗啡喃,而与β-
噻吩酮-A苯基醚的相似反应序列得到( - ) - 3-甲氧基-6-氧代-N-甲基- Δ 7 -
吗啡喃和对应的Δ 7 -isomorphinan衍
生物。