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WYD95043279

½ð³æ (СÓÐÃûÆø)

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The first efficient intermolecular reaction of gold carbene intermediates generated via gold-catalyzed alkyne oxidation has been realized using nitriles as both the reacting partner and the reaction solvent, offering a generally efficient synthesis of 2,5-disubstituted oxazoles with broad substrate scope. The overall reaction is a [2 + 2 + 1] annulation of a terminal alkyne, a nitrile, and an oxygen atom from an oxidant. The reaction conditions are exceptionally mild, and a range of functional groups are easily tolerated. With complex and/or expensive nitriles, only 3 equiv could be sufficient to achieve serviceable yields in the absence of any solvent and using only 1 mol % BrettPhosAuNTf2 as the catalyst.

[ Last edited by WYD95043279 on 2012-5-6 at 20:13 ]

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WYD95043279: ½ð±Ò+10, ·­ÒëEPI+1, ¡ïÓаïÖú 2012-05-07 11:24:41
sltmac: ½ð±Ò+20 2012-05-23 08:28:40
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