The oxazolidine derived from the reaction of oxymorphone with the Burgess reagent, temporariiy protected at 0-3 and C-6, reacts with Grignard or other suitable metallic or organometallic reagents to directly provide, for example, A/-allyl, A/-methylcyclopropyl and /V-methylcyclobutyl derivatives that are further converted into naltrexone, naloxone, nalbuphone and nalbuphine in excellent yields. These morphine analogs can be prepared from the oxazolidine in a one- pot synthesis.
来源于
氧吗啡与
伯吉斯试剂反应得到的氧杂
环丙烷,在0-3和C-6处暂时保护,与
格氏试剂或其他适当的
金属或有机
金属试剂反应,直接提供例如A-烯丙基,A-甲基环丙基和N-甲基
环丁基衍
生物,进而在高产率下转化为
纳曲酮、
纳洛酮、纳布酮和
纳布啡等。这些
吗啡类似物可以从氧杂
环丙烷中进行一锅合成。