PIFA/TEMPO‐Mediated Oxidative Cascade Cyclization of
<i>α</i>
‐[(
<i>β</i>
‐Amino)propenoyl]‐Alkylamides: Access to Polysubstituted 3,7‐Dihydrooxazolo[4,5‐
<i>c</i>
]pyridine‐2,4,6(5
<i>H</i>
)‐triones
作者:Jingwen Yuan、Bicheng Deng、Yongjiu Liang、Chitturi Bhujanga Rao、Rui Zhang、Yanning Zhao、Dewen Dong
DOI:10.1002/adsc.201900741
日期:2019.9.17
bis(trifluoroacetate) (PIFA) and 2,2,6,6‐tetramethyl piperidin‐1‐oxyl (TEMPO) has been described. This unprecedented transformation features mild reaction conditions, simple execution, high chemo‐ and regio‐selectivity, and thereby provides a facile and efficient protocol for the synthesis of polysubstituted 3,7‐dihydro‐ oxazolo[4,5‐c]pyridine‐2,4,6‐(5 H)‐triones.
苯基碘(III)双(三氟乙酸)(PIFA)和2,2,6,6-四甲基哌啶-1-氧基(TEMPO)介导的α -[[(β-氨基)丙烯酰基]-烷基酰胺的新型氧化级联环化已经描述过了。这种前所未有的转化具有温和的反应条件,简单的操作,较高的化学和区域选择性,从而为合成多取代的3,7-二氢恶唑[4,5 - c ]吡啶-2提供了简便而有效的方案, 4,6-(5 H)-三酮。