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2005
Benzopyran derivatives
R 0350
Phenylboronic Acid Mediated Triple Condensation Reactions of Phloroglucinol
Unsaturated Carbonyl Compounds. — An unprecedented title procedure af24- 127 and
fords a variety of novel C3-symmetric 2H-chromene derivatives. This process involves
three electrophilic aromatic substitution reactions and three subsequent dehydrative cyclization reactions. The reaction of ketone (XIV) with (I) leads to isolation of the isomeric 4H-chromene derivative (XV) in low yield. — (PETTIGREW, J. D.;
CADIEUX, J. A.; SO, S. S. S.; WILSON*, P. D.; Org. Lett. 7 (2005) 3, 467-470;
Dep. Chem., Simon Fraser Univ., Burnaby, B. C. V5A 1S6, Can.; Eng.) — Steudel
2005
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