An Efficient One-pot Procedure for the Direct Preparation of 4,5-Dihydroisoxazoles from Amides
作者:Tove Slagbrand、Gabriella Kervefors、Fredrik Tinnis、Hans Adolfsson
DOI:10.1002/adsc.201700154
日期:2017.6.6
reductive functionalization of amides to afford 5‐amino substituted 4,5‐dihydroisoxazoles is presented. The reduction of amides generates reactive enamines, which upon the addition of hydroximinoyl chlorides and base undergoes a 1,3‐dipolar cycloaddition reaction that gives access to the desired heterocyclic compounds. The transformation of amides is highly chemoselective and tolerates functional groups
提出了Mo(CO)6(六羰基钼)催化的酰胺还原功能化反应,提供5-氨基取代的4,5-二氢异恶唑。酰胺的还原会生成反应性烯胺,在添加羟肟酰氯和碱后会发生1,3-偶极环加成反应,从而获得所需的杂环化合物。酰胺的转化具有高度的化学选择性,并且可以耐受诸如硝基,腈,酯和酮等官能团。此外,还展示了衍生自多种氢氧羰基酰氯和酰胺的4,5-二氢异恶唑的通用范围。