Microwave-Assisted Cross-Metathesis of Unsaturated Thiocyanates: Application to the Synthesis of Thiocyanatins A and B and Analogues
作者:Olivier Piva、Fanny Cros、Béatrice Pelotier
DOI:10.1055/s-0029-1217089
日期:2010.1
The syntheses of thiocyanatin B and related dithiocyanates have been carried out by cross metathesis of unsaturated thiocyanates promoted by a ruthenium catalyst. The efficiency of the reaction depends strongly on the nature of the catalyst, the length of the alkenyl chain, and the mode of activation (conventional heating or microwave activation). In the later case, isomerization of double bonds took place and altered the course of the reaction. Alternatively, thiocyanatins A and B were synthesized by only a three-step and a two-step procedure, respectively, from readily available tosylates.
硫氰酸铂 B 和相关二硫代氰酸酯的合成是通过不饱和硫氰酸盐在钌催化剂的促进下进行交叉偏析来实现的。反应的效率在很大程度上取决于催化剂的性质、烯基链的长度和活化方式(传统加热或微波活化)。在后一种情况下,双键发生了异构化,改变了反应的进程。另外,硫氰酸盐 A 和 B 也分别只需三步和两步就能从现成的对甲苯磺酸盐中合成。