appropriately functionalized 1,3,4-trisubstituted cyclopent-1-ene to 1 by way of an integrated oxidation/reduction/cyclization (iORC) process. This domino sequence, initiated by oxidative cleavage of cyclopentene ring, generated subsequently a cyclohexenone, an indole and a 1,3-bridged piperidine ring through formation of one C−C and two C−N bonds. Compound 1 is subsequently converted to nordasycarpidone, dasycarpidone
uleine 型
生物碱的结构特征在于存在桥连的四环六氢-1 H -1,5-methanoazocino[4,3- b ]indole 环系统1。已经开发了各种策略来访问这种多环结构基序。我们在此报告适当官能化的1,3,4-三取代的环戊-1-烯的一步法转化成1通过一个集成的氧化/还原/环化(的方式我ORC)过程。该多米诺序列由
环戊烯环的氧化裂解引发,随后通过形成一个 C-C 和两个 CN 键生成
环己烯酮、
吲哚和 1,3-桥接
哌啶环。化合物1随后转化为nordasycarpidone、dasycarpidone和uleine。分子的手性通过市售的内消旋-3,5-
二乙酰氧基-1-
环戊烯的酶促去对称化引入。