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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Organocatalytic synthesis of chiral benzopyrans
Tetrahedron Asymmetry, Volume 17, No. 12, Year 2006
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Description
Benzopyrans, or chromenes, are widespread in nature and are considered to be a privileged scaffold in medicinal chemistry. Herein, we report the first organocatalyzed asymmetric synthesis of chiral benzopyrans. The benzopyran unit is constructed through a domino reaction involving an oxa-Michael attack of salicylic aldehyde derivatives onto α,β-unsaturated aldehydes, activated through iminium-ion formation with the organocatalyst, followed by an intramolecular aldol reaction and subsequent elimination of water. This overall reaction sequence provides benzopyrans with aromatic C-2 substituents in up to 60% yield and 60% enantioselectivity, while C-2 aliphatic analogues can be obtained in 90% enantiomeric excess, but with only 20% yield. The role of additives, as well as the possible racemization of the benzopyran, was also investigated. © 2006 Elsevier Ltd. All rights reserved.
Authors & Co-Authors
Govender, Thavendran
Unknown Affiliation
Arvidsson, Per I.
Unknown Affiliation
Statistics
Citations: 131
Authors: 2
Affiliations: 1
Identifiers
Doi:
10.1016/j.tetasy.2006.06.028
ISSN:
1362511X
Research Areas
Environmental