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2004
Indan derivatives
Q 1050
Cobalt-Catalyzed Regioselective Carbocyclization Reaction of o-Iodophenyl
and Aldehydes with Alkynes, Acrylates, and Acrylonitrile: A Facile
45- 115 Ketones
Route to Indenols and Indenes. — An efficient cobalt-catalyzed carbocyclization of
o-iodophenyl ketones and aldehydes with alkynes is presented to afford indenols (III),
(V)/(VI) and (XIII)/(XIV) in high yields. Good regioselectivities are achieved in most
cases for unsymmetrical alkynes (IV) and (XII). Similarly, carbocyclization of the
o-iodophenylcarbonyl compounds with acrylates provides an efficient access towards
indenecarboxylates (VIII) and (XV). An unexpected decyanation is observed in the carbocyclization of ketones (I) with acrylonitrile (IX). — (CHANG, K.-J.;
RAYABARAPU, D. K.; CHENG*, C.-H.; J. Org. Chem. 69 (2004) 14, 4781-4787;
Dep. Chem., Natl. Tsing Hua Univ., Hsinchu 30043, Taiwan; Eng.) — Mischke
2004
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