Synthesis of neopine and its 5β- and 7-substituted derivatives (chemistry of opium alkaloids, part XL≠)
作者:G. J. Meuzelaar、R. H. Woudenberg、A. Sinnema、L. Maat
DOI:10.1002/recl.19931121103
日期:——
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。