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Rh(I)-catalyzed cyclization of 1-arylprop-2-yn-1-ol derivatives utilizing rhodium 1,4-migration.
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Abstract
A highly useful method for the construction of cyclopentanone derivatives fused with aromatic ring based on hydrorhodation-1,4-rhodium migration sequence is achieved. Treatment of 1-aryl-prop-2-yn-1-ols, which are easily accessible via an addition of acetylides to the corresponding aryl aldehydes, with a catalytic amount of [Rh(cod)2]2(BF4) and P(p-tolyl)3 in the presence of a base gives cyclopentanone derivatives in moderate to good yield.