with sodium methoxide gave 7β-methoxyneopine (9). Similar reactions were performed with 14β-bromo-5β-methylcodeine (4), yielding the corresponding 5β-methyl derivatives 6, 8 and 10. Acetylation of 3 and 4 gave 6α-O-acetyl-14β-bromocodeine (11) and its 5β-methyl analogue 12, respectively, from which the ortho esters 13 and 14 were obtained after treatment with methanol. Acid hydrolysis of 13 or, better
将14β-
溴可待因(3)与
甲醇和
三乙胺加热,得到6α,7α-环氧-6-脱氧
尼古丁(5)。用
氢化铝锂将
环氧化物5还原成新松(7),而将5与
甲醇钠反应得到7β-甲氧基新松(9)。用14β-
溴-5β-甲基
可待因(4)进行了类似的反应,得到相应的5β-甲基衍
生物6、8和10。将3和4乙酰化可得到6α - O-乙酰基-14β-
溴可待因(11)及其5β-甲基类似物12分别用
甲醇处理后,从中获得原酸酯13和14。13酸
水解,或者更好的是11溶剂分解在
水中,生成6α - O-乙酰基-7α-羟基neopine (15)和7α-乙酰氧基neopine (17)的混合物。在相同条件下12和14得到5β-甲基类似物16和18。