Sparing the ortho-position in nucleophilic aromatic substitution-specific displacement of the 4-SePh group in 2,4-bis(phenylseleno)nitrobenzene
作者:Nicolai Stuhr-Hansen、Thorstein Finn Götze、Lars Henriksen、Theis Ivan Sølling、Annette Langkilde、Henning Osholm Sørensen
DOI:10.1002/hc.20519
日期:——
Upon treatment of o- and p-(phenylseleno)nitrobenzenes with sodium methoxide quantitative exchange reactions took place, affording the corresponding methoxynitrobenzenes. Upon reaction between 2,4-bis(phenylseleno)nitrobenzene 2 and sodium methoxide, an unusual regiopure formation of 4-methoxy-2-(phenylseleno)nitrobenzene 3 was observed. This product remained unreactive toward an excess of sodium methoxide
用甲醇钠处理邻和对(苯基硒基)硝基苯后发生定量交换反应,得到相应的甲氧基硝基苯。在 2,4-双(苯基硒基)硝基苯 2 和甲醇钠反应后,观察到 4-甲氧基-2-(苯基硒基)硝基苯 3 的异常区域纯形成。该产品对过量的甲醇钠保持不反应,从而阻止了 2,4-二甲氧基硝基苯 6 的形成。通过合成研究、X 射线晶体学和 DFT 计算检查了反应物和中间体 Meisenheimer 配合物的性质。我们发现观察到的选择性可以根据传统的共振考虑来理解。© 2009 Wiley Periodicals, Inc. 杂原子化学 20:101–108, 2009; 在线发表于 Wiley InterScience (www. interscience.wiley.com)。DOI 10.1002/hc.20519