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Fused 6,6,5-ring systems Q 1070 Functionalization of Csp 3 -H Bond-Sc(OTf)3-Catalyzed Domino 1,5-Hydride Shift/Cyclization/Friedel-Crafts Acylation Reaction of Benzylidene Meldrum's Acids. -Mild thermolysis of title compounds bearing a tethered electron-rich phenethyl group in the presence of Sc(O-Tf)3 results in a [1.5]-hydride shift/cyclization reaction to give spiro Meldrum's acid intermediates. On further heating at 100°C, they undergo intramolecular Friedel-Crafts cyclization to yield the desired tetracyclic skeleton of tetrahydrobenzo[b]fluoren-11-ones. -(MAHONEY, S. J.; MOON, D. T.; HOLLINGER, J.; FILLION*, E.; Tetrahedron Lett. 50 (2009) 33, 4706-4709; Dep. Chem., Univ. Waterloo, Waterloo, Ont. N2L 3G1, Can.; Eng.) -Mais 48-105

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