Abstract
The total synthesis of (-)-isoschizogamine was accomplished, featuring the construction of the quaternary carbon center by the modified Johnson-Claisen rearrangement in basic media and the facile assembly of the key tetracyclic quinolone intermediate through a cascade cyclization. The characteristic cyclic aminal was constructed by late-stage C-H functionalization at the position adjacent to the lactam nitrogen using a combination of CrO3 and nBu4 NIO4 and subsequent Bi(OTf)3 -mediated cyclization.
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