Total Synthesis of Spiro[cyclohexane-2-indoline] Alkaloids: A Regio- and Diastereoselective Spirocyclization Approach
Lu Chen1,2, Kejing Xie1, Jingyang Zhang1
1School of Pharmaceutical Sciences, Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Beijing Advanced Innovation Center for Structural Biology & Frontier Research Center for Biological Structure, Tsinghua University, Beijing, 100084, China.
Abstract:
A direct spirocyclization approach for the chemical synthesis of spiro[cyclohexane-2-indoline] alkaloids is reported. The absolute stereochemistry was introduced by a desymmetrizing Dieckmann condensation, and the relative stereochemistry was controlled by the manipulation of the kinetic and thermodynamic pathways of the spirocyclization. By contrast to the biogenetic proposal involving the diester-type alkaloid as the precursor, we demonstrate that chemically a common lactone-type intermediate could bridge the chemical synthesis of this class of natural products.
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