Thiosulfonates and disulfides are important scaffolds in bioactive molecules and drugs, yet methods for the synthesis of these compounds that start from simple and commercially available feedstocks with sustainable routes are scarce. In this report, we present a green protocol for the synthesis of these valuable S–S motifs through selective oxidation of thiols using H2O2 or air as oxidant and anionic
硫代磺酸盐和二硫化物是生物活性分子和药物的重要支架,但从简单且可商业获得的原料开始并具有可持续路线的合成这些化合物的方法很少。在本报告中,我们提出了一种绿色方案,通过使用 H 2 O 2或空气作为氧化剂和阴离子多钼酸(Mo 8 O 26 4−)作为催化剂选择性氧化硫醇来合成这些有价值的 S-S 基序。该方法的显着特点是可扩展性、操作简单、广泛的功能组兼容性和良好的化学选择性。反应混合物的自由基捕获实验、动力学实验、循环伏安法、紫外-可见光谱、红外光谱和拉曼光谱监测等机理研究支持钼(V)-羟基物种和钼( VI )-过氧化合物的形成-分别驱动两个不同催化循环的物质。
Iodide-Catalyzed Synthesis of Secondary Thiocarbamates from Isocyanides and Thiosulfonates
作者:Pieter Mampuys、Yanping Zhu、Sergey Sergeyev、Eelco Ruijter、Romano V. A. Orru、Sabine Van Doorslaer、Bert U. W. Maes
DOI:10.1021/acs.orglett.6b01023
日期:2016.6.17
A new method for the synthesis of secondary thiocarbamates from readily available isocyanides and thiosulfonates with broad functional group tolerance is reported. The reaction proceeds under mild reaction conditions in isopropanol and is catalyzed by inexpensive sodium iodide.