As a better alternative to radical cyclization, 5-(2-bromo-6-methoxyphenoxy)-2-methyl-1,2,3,4,5,6,7,8-octahydroisoquinoline (2) and its 1-oxo analog 3 underwent Pd-catalyzed intramolecular cyclization to give the tetracyclic (ACNO) morphine fragments 5 and 6 respectively. 4-[(2′-Iodo-6′-methoxyphenoxy)methyl]-1-ethoxycarbonyl-1,2,5,6,-tetrahydropyridine (11) reacted similarly to provide the tricyclic
作为自由基环化的更好替代方法,5-(2-
溴-6-
甲氧基苯氧基)-2-甲基-1,2,3,4,5,6,7,8-八氢
异喹啉(2)及其1-氧代类似物3进行Pd催化的分子内环化,分别得到四环(ACNO)
吗啡片段5和6。4-[(2'-
碘-6'-
甲氧基苯氧基)甲基] -1-乙氧基羰基-1,2,5,6,-四氢
吡啶(11)类似地反应以70%的收率和45%的产率提供
三环ANO片段12当使用Pd-(S)-BINAP配合物作为催化剂时。