A novel atom-economic three-component one-pot reaction of a primary amine, an S-alkylisothiouronium salt and a Michael receptor is reported, which affords a guanidinium salt and thioether simultaneously. The guanidine moiety is involved in catalyzing the conjugated Michael addition of the mercaptan. The reaction proceeds under ambient conditions using a non-toxic EtOH–H2O mixture as the solvent, and the two products can be very easily purified. Complete atom economy is achieved by fully utilizing the S-alkylisothiouronium salt and converting the previously wasted mercaptan by-product into the valuable thioether.
报道了一种新颖的原子经济性三组分一锅反应,涉及一种初级胺、一种S-烷基异
硫脲盐和一个迈克尔受体,能够同时获得盐基盐和
硫醚。
胍基部分参与催化与巯基的共轭迈克尔加成。该反应在常温下进行,使用无毒的
乙醇-
水混合物作为溶剂,两个产物可以非常容易地进行纯化。通过充分利用S-烷基异
硫脲盐并将之前浪费的巯基副产物转化为有价值的
硫醚,实现了完全的原子经济性。