HFIP-mediated strategy towards β-oxo amides and subsequent Friedel-Craft type cyclization to 2‑quinolinones using recyclable catalyst
作者:Arup K. Kabi、Raghuram Gujjarappa、Nagaraju Vodnala、Dhananjaya Kaldhi、Ujjawal Tyagi、Kalisadhan Mukherjee、Chandi C. Malakar
DOI:10.1016/j.tetlet.2020.152535
日期:2020.11
A simple and cost-effective 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP)-mediated protocol for the synthesis of β-oxo amides has been described by using amines and β-keto esters as substrates. The reaction conditions were found to be highly efficient towards the cleavage of CO bond and consequent formation of the products in excellent yields and selectivity. The obtained β-oxo amides were further transformed
以胺和β-酮酸酯为底物,描述了一种简单且经济高效的1,1,1,3,3,3-六氟-2-丙醇(HFIP)介导的合成β-氧代酰胺的方案。发现反应条件对于裂解CO键和由此以优异的产率和选择性形成产物是高度有效的。将所得到的β氧代酰胺在被进一步转化为合成有用2-喹啉酮通过芳族环的分子内弗里德尔-工艺类型环化使用铁氧体作为可回收催化剂。在反应条件下,具有多种官能团的底物的光谱被很好地耐受。文献和质谱证据充分验证了所提出的机制途径。