Addition of catalytic amounts of a phosphite‐based gold(I) catalyst efficiently triggers the intermolecular [2+2] cycloaddition of allenes and alkenes substituted by electron‐donor groups. The reaction is fast and furnishes cyclobutane derivatives in a stereoselective manner using low catalyst loadings. Besides, the same catalyst selectively affords homodimerization products from the starting allene, a process that may be conveniently fine tuned by addition of norbornene.
Intramolecular C À O bond forming reactions of aryl 2-bromobenzyl ketones lead to benzo [b]furans. The cyclizations can be catalyzed by 10 mol% of iron trichloride (of 98% or of 99.995% purity) or sub-mol% quantities of copper(II) chloride (of 99.995% purity).
Regiocontrolled Gold(I)-Catalyzed Cyclization Reactions of N-(3-Iodoprop--2-ynyl)-N-tosylanilines. -Depending on the gold catalyst and the nature of the aryl substituents, selective formation of 3-or 4-iodinated 1,2-dihydroquinolines takes place. -(MORAN-POLADURA, P.; SUAREZ-PANTIGA, S.; PIEDRAFITA, M.; RUBIO, E.; GONZALEZ*, J. M.; J. Organomet. Chem. 696 (2011) 1, 12-15, http://dx.
Iron and Copper Salts in the Synthesis of Benzo[b]furans. -Intramolecular C-O bond forming reaction in o-bromobenzyl aryl ketones is smoothly catalyzed by FeCl3 to give title benzofurans (II) and (IV). The same reaction is also catalyzed by very low amounts of CuCl2 (0,0088 mol%). -(BONNAMOUR, J.; PIEDRAFITA, M.; BOLM*, C.; Adv. Synth. Catal.
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