A simple and efficient method has been developed for the synthesis of N-allylthioureas from allylic bromides in one-pot by using a supported reagents system, KSCN/SiO2–RNH3OAc/Al2O3, in which allyl bromide reacts first with KSCN/SiO2 and the product, allyl isothiocyanate, reacts with RNH3OAc/Al2O3 to give the final product, N-allylthiourea, in good yield.
通过使用支持的试剂系统KSCN / SiO 2 -RNH 3 OAc / Al 2 O 3,由一锅法从烯丙基溴中合成N-烯丙基硫脲的简单有效方法已被开发,其中烯丙基溴首先与KSCN / SiO 2和产物异硫氰酸烯丙酯与RNH 3 OAc / Al 2 O 3反应,以高收率得到最终产物N-烯丙基硫脲。
One pot synthesis using supported reagents system KSCN/SiO2–RNH3OAc/Al2O3: synthesis of 2-aminothiazoles and N-allylthioureas
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.
Discussion
作者:Zhenyu Wang
DOI:10.1111/0022-1082.00366
日期:2001.8
Hecht, Chemische Berichte, 1892, vol. 25, p. 822
作者:Hecht
DOI:——
日期:——
Novel Synthesis of Dihydrothiazoles from the Selenium‐Induced Cyclization of Allyl Thioureas
作者:Hao Qian、Yanhong Lian
DOI:10.1080/00397910701845761
日期:2008.2.1
The reaction of allylic thioureas with phenylselenenyl chloride affords 2-amino dihydrothiazoles in excellent yields by selenium-induced cyclization of allylic thioureas.