realized under basic conditions via the copper-catalyzed cyclization of ketones with nitriles. The reaction proceeds via a novel pathway involving the nitriles acting as electrophiles and consecutive C–C bond and two C–N bond formations and shows broad substrate scope and good tolerance of many important functional groups. This strategy represents a new platform for constructing pyrimidine structures.
Synthesis of Highly Substituted Oxazoles through Iodine(III)-Mediated Reactions of Ketones with Nitriles
作者:Akio Saito、Nao Hyodo、Yuji Hanzawa
DOI:10.3390/molecules170911046
日期:——
trifluoromethanesulfonic acid (TfOH) or bis(trifluoromethane-sulfonyl)imide (Tf2NH), iodosobenzene (PhI=O) efficiently promoted the reactions of dicarbonyl compounds as well as monocarbonyl compounds with nitriles to give 2,4-disubstituted and 2,4,5-trisubstituted oxazole in a single step under the mild conditions.
Highly Efficient Synthesis of Pyrimidines under Microwave-assisted Conditions
作者:Mark C. Bagley、David D. Hughes、Paul H. Taylor
DOI:10.1055/s-2003-36781
日期:——
Microwave irradiation of an amidine and alkynone in acetonitrile at 120 °C gives 2,4-disubstituted and 2,4,6-trisubstituted pyrimidines in very high yield.
The metal-free [2 + 2 + 1] annulation of alkynes, nitriles, and O-atoms for the regioselective assembly of 2,4-disubstituted and 2,4,5-trisubstituted oxazole compounds has been achieved by the use of PhIO with TfOH or Tf2NH. The present reaction could be applied to a facile synthesis of an anti-inflammatory drug.