Abstract
Spiro-oxindoles, epi-Spirotryprostatin A and its analogues were prepared from a tactical combination of cascade catalytic bimetallic Pd (0)/Ag(I), intramolecular Heck and subsequent imine → azomethine ylide → 1,3-Dipolar cycloaddition reactions. The cascade features in situ generation of azomethine ylides and dipolarophiles and produces two new rings together with three stereocentres in good to excellent yields.
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