Synthesis and odor characteristics of
<scp>
<i>N</i>
‐substituted
</scp>
pyrrolyl ketones derived from
<scp>
<i>N</i>
‐substituted
</scp>
acetylpyrroles and alcohols
作者:Mingqin Zhao、Jingyi Hu、Xiaoming Ji、Lu Han、Mengxiao Li、Miao Lai
DOI:10.1002/jhet.4612
日期:——
A transition-metal and ligand free base-mediated a radical condensation reaction to form N-substituted pyrrolyl ketones with water as the side product is developed. The transformation is performed with t-BuOK, and a broad range of N-substituted acetylpyrroles and alcohols are well tolerated under the optimized conditions. Preliminary studies indicate that the radical anion of the benzylic alcohol is
过渡金属和配体游离碱介导的自由基缩合反应形成N-取代的吡咯酮,副产物为水。该转化是使用t -BuOK 进行的,并且在优化条件下可以很好地耐受各种N-取代的乙酰吡咯和醇类。初步研究表明,苄醇的自由基阴离子被认为是关键中间体,它与乙酰吡咯的烯醇化物偶联形成新的CC键。随后,通过消去得到相应的吡咯查耳酮,烯酮中间体被还原得到N-取代的吡咯酮。通过气相色谱 - 质谱 - 嗅觉测定法(GC-MS-O)评估获得的吡咯酮的气味特征。吡咯酮具有多种特征气味,通常与相应的乙酰吡咯和醇不同。其中,3-环丙基-1-(1-甲基-1H-吡咯-2-基)丙-1-酮(3c')和5,9-二甲基-1-(1-甲基-1H-吡咯)的化合物根据热解–GC/MS 的结果,-2-yl)dec-8-en-1-one (3g ′ ) 在高温下没有分解。