Unexpected<i>N</i>-Demethylation of Oxymorphone and Oxycodone<i>N</i>-Oxides Mediated by the Burgess Reagent: Direct Synthesis of Naltrexone, Naloxone, and Other Antagonists from Oxymorphone
作者:Lukas Werner、Martina Wernerova、Ales Machara、Mary Ann Endoma-Arias、Jan Duchek、David R. Adams、D. Phillip Cox、Tomas Hudlicky
DOI:10.1002/adsc.201200676
日期:2012.10.8
N-Oxides derived from oxycodone and O-acyloxymorphone were treated with the Burgess reagent to provide the corresponding oxazolidines in excellent yields. Oxazolidines derived from O-acyloxymorphone were further hydrolyzed to noroxymorphone, whose alkylation furnished naltrexone, naloxone, and nalbuphone, which can be converted to nalbuphine, the mixed agonist-antagonist analgesic. The entire sequence
用Burgess试剂处理得自羟考酮和O-酰氧基吗啡酮的N-氧化物,以优异的收率提供相应的恶唑烷。衍生自O-酰氧基吗啡酮的恶唑烷进一步水解为去甲羟吗啡酮,其烷基化反应提供了纳曲酮,纳洛酮和纳布酮,它们可以转化为纳布啡,这是一种激动剂-拮抗剂混合的镇痛剂。从羟吗啡酮到各种拮抗剂的整个序列减少为三个一锅操作,总收率优异。另外,合成了具有固定的赤道构型的恶唑烷与烯丙基或环丙基甲基的季盐。提供了所有化合物的完整光谱和实验数据。