P<sup>III</sup>/P<sup>V</sup>-Catalyzed Beckmann Reaction and Sequential [2,3]-Sigmatropic Rearrangement to Construct 2-Amidopyridines
作者:Gang Sun、Yi-Han Yu、Han Kai、Fan-Ying Meng、Haoliang Yuan、Xiaoan Wen、Liu Liu、Qing-Long Xu
DOI:10.1021/acs.orglett.4c00933
日期:——
the conversion of ketoximes and pyridine-N-oxides into 2-amidopyridines through sequential Beckmann rearrangement followed by [2,3]-sigmatropic rearrangement. The readily available ketoximes could be activated to nitrilium ions in PIII/PV redox catalysis and could efficiently participate in the domino reaction of pyridine-N-oxides, thus providing various substituted 2-amidopyridines in moderate to excellent
报道了一种有机磷催化合成取代2-氨基吡啶的方法。该方法采用小环有机磷基催化剂和氢硅烷还原剂,通过顺序贝克曼重排和[2,3]-σ重排驱动酮肟和吡啶-N-氧化物转化为2-酰胺吡啶。容易获得的酮肟可以在P III / P V氧化还原催化中被活化为腈离子,并且可以有效地参与吡啶-N-氧化物的多米诺反应,从而以中等至优异的收率提供各种取代的2-酰胺吡啶。该策略具有出色的官能团耐受性和广泛的底物范围。