卤素键催化作为一种激活有机分子的有力工具,最近受到越来越多的关注。然而,到目前为止,催化剂结构的变化非常有限。本文中,我们报道了使用碘炔作为卤素键供体催化剂的第一个例子。通过使用带有五氟苯基的碘炔作为催化剂,硫酰胺可以有效地活化并与2-氨基苯酚反应生成苯并恶唑,收率很高。包括13 C NMR光谱分析和一些对照实验在内的机理研究提供了具体的证据,表明这种催化活化是基于卤素键。因此,在这项研究中获得的结果表明,碘炔可以作为卤素支架催化未来发展的新支架。
Tri-lacunary polyoxometalates of Na8H[PW9O34] as heterogeneous Lewis base catalysts for Knoevenagel condensation, cyanosilylation and the synthesis of benzoxazole derivatives
作者:Shen Zhao、Yang Chen、Yu-Fei Song
DOI:10.1016/j.apcata.2014.01.017
日期:2014.4
development of tri-lacunary polyoxometalates (POMs) of Na8H[A-PW9O34]·7H2O and Na8H[B-PW9O34]·19H2O (Na-A-PW9 and Na-B-PW9) as highlyselective and efficient heterogeneous Lewis base catalysts for Knoevenagel condensation, cyanosilylation of various aldehydes and ketones and the synthesis of benzoxazole derivatives at 25 °C under mild conditions. Since both Na-A-PW9 and Na-B-PW9 display no characteristic porosity
Efficient Aerobic Oxidative Synthesis of 2‐Substituted Benzoxazoles, Benzothiazoles, and Benzimidazoles Catalyzed by 4‐Methoxy‐TEMPO
作者:Yong‐Xing Chen、Ling‐Feng Qian、Wei Zhang、Bing Han
DOI:10.1002/anie.200803381
日期:2008.11.17
Catalytic synthesis of 2-alkylbenzoxazoles
作者:N. S. Kozlov、B. I. Kiselev
DOI:10.1007/bf00742357
日期:——
Synthetic Anticonvulsants. The Preparation and Properties of Some Benzoxazoles<sup>1</sup>
作者:W. G. Bywater、W. R. Coleman、Oliver Kamm、H. Houston Merritt
DOI:10.1021/ja01222a008
日期:1945.6
Direct α-Chalcogenation of Aliphatic Carboxylic Acid Equivalents
作者:Aniket Gupta、Ajijur Rahaman、Sukalyan Bhadra
DOI:10.1021/acs.orglett.9b02424
日期:2019.8.2
A novel approach to α-chalcogenation of aliphaticcarboxylicacids has been developed by means of transforming them as the corresponding benzazoles. The catalyst system, consisting of CuI, DMSO, and a base, operates through a unique mechanism to access a range of practically significant thio- and selenoethers that are otherwise challenging to achieve. The applicative potentials have been exemplified
通过将脂肪族羧酸转化为相应的苯唑类,开发了一种将脂肪族羧酸进行 α-硫属元素化的新方法。由 Cu I 、DMSO 和碱组成的催化剂体系通过独特的机制运行,以获取一系列具有实际意义的硫醚和硒醚,否则这些化合物难以实现。应用潜力已通过利用所得硫属化合物作为合成生物学相关分子和合成中间体的前体来举例说明。