Multicomponent Cascade Cycloaddition Involving Tropone,
Allenoate, and Isocyanide: A Rapid Access to a 7,6,5-Fused Tricyclic
Skeleton
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Abstract
Multicomponent cascade cycloaddition
of tropone, allenoate, and
isocyanide has been disclosed. This method allows for the rapid construction
of a highly unusual tricyclic skeleton in an efficient manner. The
proposed transformation proceeds through [8 + 2 + 1] cycloaddition,
[1,5]-H shift, and cyclization followed by an alkoxy group migration
process