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α,β-Unsaturated butenolides in an organocatalytic doubly annulative cascade for the preparation of 3,4-dihydrocoumarins.
Organic & Biomolecular Chemistry 2019 Februrary 16
A new, organocatalytic doubly annulative cascade utilizing α,β-unsaturated butenolides and imines (derived from salicyl aldehydes and α-amino-γ-lactones) as starting materials is described. The developed strategy is based on two annulative processes: (1) initial [3 + 2]-dipolar cycloaddition allowing for the construction of a pyrrolidine ring; and (2) the butenolide-ring-opening reaction leading to the introduction of a 3,4-dihydrocoumarin framework. Target polycyclic compounds have been obtained with excellent chemical and stereochemical efficiencies.
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