Journal
TETRAHEDRON LETTERS
Volume 49, Issue 35, Pages 5208-5210Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2008.06.024
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Funding
- National Natural Science Foundation of China [20702047]
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A highly efficient method for the diastereoselective synthesis of cis-fused pyranobenzopyrans and furanobenzopyrans via 2 mol % of molecular iodine-catalyzed reaction of o-hydroxybenzaldimines with 3,4-dihydro-2H-pyran and 2,3-dihydrofuran at ambient temperature is described. 2-Butoxy-4-N-aryl-aminobenzopyrans were also synthesized from o-hydroxybenzaldimine and n-butyl vinyl ether using this procedure. (C) 2008 Elsevier Ltd. All rights reserved.
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