A simple and efficient method has been developed for the synthesis of 2-aminothiazoles and N-allylthioureas from commercially available materials in one pot by using a supported reagents system, KSCN/SiO2-RNH3OAc/Al2O3, in which alpha-halo ketone reacts first KSCN/SiO2 and the product, alpha.-thiocyanatoketone, reacts with RNH3OAc/Al2O3 to give the final product, 2-aminothiazoles, in good yield and allyl bromide reacts with KSCN/SiO2 and the product, allyl isothiocyanate, reacts with RNH3OAc/Al2O3 to give N-allylthiourea. (c) 2006 Elsevier Ltd. All rights reserved.
One-pot synthesis of 2-aminothiazoles using supported reagents
A simple and efficient method has been developed for the synthesis of 2-aminothiazoles from α-bromo ketones in one-potusing a supported reagents system, KSCN/SiO2–RNH3OAc/Al2O3, in which α-bromo ketone reacts first with KSCN/SiO2 and the product, α-thiocyano ketone, reacts with RNH3OAc/Al2O3 to give the final product, 2-aminothiazole, in high yield.
一种简单且有效的方法已用于从α溴酮-2-氨基噻唑在一锅合成中使用负载的试剂系统被开发出来,KSCN /二氧化硅2 -RNH 3 OAC / Al的2 Ó 3,其中α溴酮首先与KSCN / SiO 2反应,然后产物α-硫氰基酮与RNH 3 OAc / Al 2 O 3反应,以高收率得到最终产物2-氨基噻唑。