Journal
ORGANIC LETTERS
Volume 11, Issue 20, Pages 4676-4679Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol9019524
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Funding
- MOST [2010CB832200, 2009ZX09501]
- NSFC [20672128, 20621062]
- CAS [KJCX2-YW-H08]
- SHMCST [08JC1422800, 07DZ22001]
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Transformation of reactive isochromenylium intermediates to the corresponding storable and stable reagents has been achieved, and a number of isochromerylium tetrafluoroborates (ICTBs, 1) have been conveniently prepared and characterized. Direct metal-free treatment of isochromenylium tetrafluoroborate la with olefins afforded a variety of polycyclic frameworks 4 via mild cascade reactions. Starting from the prefunctionalized o-alkynylbenzaldehydes, a one-pot metal-free procedure of intramolecular cascade annulation to 2,3-dihydrophenanthren-4(1H)-one derivatives was also developed.
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