Organic Letters · 2007 · 23 citations · 8 references
Natural SciencesChemistryOrganic ChemistryDiversity-oriented SynthesisHeterocycle SynthesisHeterocyclic ChemistryMacrocycle SynthesisOrganic SynthesisRetrosynthetic AnalysisAsymmetric Heterocycle SynthesisChiral Auxiliary Design
A novel cyclopropenyl-containing 1,3-spiroaminoalcohol auxiliary has been used in a variety of asymmetric Diels-Alder reactions providing endo adducts with diastereomeric ratios ranging from 2:1 up to >99:1. In addition, unexpected regiochemistry was observed for a Diels-Alder reaction between cyclopropenyl dienophile and 4-vinyl-1,2-dihydronapthalene.
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Michael Limbach, Suryakanta Dalai, Armin de Meijere · Advanced Synthesis & Catalysis · 2004 · 34 citations