Rapid Construction of the ABCE Tetracyclic Tertiary Amine Skeleton in Daphenylline Enabled by an Amine–Borane Complexation Strategy
2019
Deng, Meng | Yao, Yanmin | Li, Xiaohu | Li, Nan | Zhang, Xiao | Liang, Guangxin
A synthetically challenging tetracyclic tertiary amine framework in the Daphniphyllum alkaloid daphenylline was established in a six-step sequence featuring an intermolecular Diels–Alder cycloaddition/oxidative aromatization sequence. The utilization of an amine–borane complexation strategy is the key to successful transformations on our tertiary amine substrates.
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