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Development of the Intramolecular Prins Cyclization/Schmidt Reaction for the Construction of the Azaspiro[4,4]nonane: Application to the Formal Synthesis of (±)-Stemonamine

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journal contribution
posted on 2011-02-18, 00:00 authored by Zhi-Hua Chen, Yong-Qiang Tu, Shu-Yu Zhang, Fu-Min Zhang
A TiCl4-promoted tandem intramolecular Prins cyclization/Schmidt reaction has been designed and developed to be an efficient method for the construction of the azaspiro[4,4]nonane. The present tandem protocol has been employed to construct the tricyclic azaquaternary skeleton (ring A, B, and C) of stemonamine.