McClelland, Robert A.; Engell, Karen M.; Larsen, Truels S., Journal of the Chemical Society. Perkin transactions II, 1994, # 10, p. 2199 - 2206
作者:McClelland, Robert A.、Engell, Karen M.、Larsen, Truels S.、Soerensen, Poul E.
DOI:——
日期:——
SYNTHESIS OF XANTHENES, INDANES, AND TETRAHYDRONAPHTHALENES VIA INTRAMOLECULAR PHENYL–CARBONYL COUPLING REACTIONS
作者:Chih-Wei Kuo、Jim-Min Fang
DOI:10.1081/scc-100103323
日期:2001.1
Benzaldehydes and acetophenones bearing tethered carbonyl chains underwent the intramolecular phenyl–carbonyl coupling reactions, by mediation of samarium diiodide and hexamethylphosphoramide, to afford the xanthenes and fused benzocarbocyclic compounds containing carbonyl and hydroxyl substituents.
accessible chiral carboxylic acid catalyst exerts control over asymmetric cyclizations of acyclic ketone-derived trisubstituted oxocarbenium ions, thereby providing access to highly enantioenriched dihydropyran products containing a tetrasubstituted stereogenic center. The high acidity of the carboxylic acid catalyst, which exceeds that of the well-known chiral phosphoric acid catalyst TRIP, is largely