Suzuki-Miyaura arylations of tetramic acid sulfonates: Evaluation of lactam protection, sulfonate esters, and sterics
作者:Sarah J. P. Yoon-Miller、Kathryn M. Dorward、Kimberly P. White、Erin T. Pelkey
DOI:10.1002/jhet.96
日期:2009.5
The synthesis of 3,4-diaryl-3-pyrrolin-2-ones and 4-aryl-3-pyrrolin-2-ones using Suzuki–Miyaura cross-coupling reactions of tetramic acid sulfonates with arylboronic acids has been studied. The effect that sulfonate ester, sterics, and lactam protection has on the cross-coupling reaction was evaluated. As expected, triflates were better cross-coupling partners than the corresponding tosylates. The
研究了使用四磺酸磺酸盐与芳基硼酸的Suzuki-Miyaura交叉偶联反应合成3,4-二芳基-3-吡咯啉-2-酮和4-芳基-3-吡咯啉-2-酮。评估了磺酸酯,空间位和内酰胺保护对交叉偶联反应的影响。不出所料,三氟甲磺酸酯比相应的甲苯磺酸盐更好地交叉偶联。在3-位引入芳基仅部分影响产率。重要的是,缺乏内酰胺保护基的四甲酸三氟甲磺酸酯(和较小程度的甲苯磺酸酯)仍然是有效的底物。J.杂环化学。,46,447(2009)。