Efficient one-pot three-component synthesis of N-(4-arylthiazol-2-yl) hydrazones in water under ultrasound irradiation
作者:Dong-Nuan Zhang、Ji-Tai Li、Ya-Li Song、Hui-Min Liu、Hong-Ya Li
DOI:10.1016/j.ultsonch.2011.10.017
日期:2012.5
A highly efficient and facile one-pot three-component synthesis of N-(4-arylthiazol-2-yl) hydrazones was carried out in excellent yield without any catalyst in water under ultrasound irradiation.
Abstract An efficient and facile synthesis of 2,4-disubstituted thiazoles is achieved by a one-pot reaction of aldehydes and α-bromoketones with thiosemicarbazide by grindingunder catalyst- and solvent-freeconditions. This method has notable advantages in terms of simple workup, neat conditions, high yield, reasonably rapid reaction rate, and environmental friendliness. Supplemental materials are
Study of Oxidative Cyclization Using PhI(OAc)2 in the Formation of Benzo[4,5]thiazolo[2,3-c][1,2,4]triazoles and Related Heterocycles – Scope and Limitations
the synthesis of benzo[4,5]thiazolo[2,3- c ][1,2,4]triazoles and related heterocycles under mild conditions was herein developed. The key step of this transformation is an oxidative cyclization employing PhI(OAc) 2 as reagent. Scope and limitations (group functionality tolerance and sterics) were studied showing the robustness of the present methodology which can be used as potential access to new fused
Cyclization of Isothiosemicarbazones. III. Formation of Thiazolines and Thiazoles through Potential Sulfonium Salts from<i>N</i>,<i>S</i>-Disubstituted Isothiosemicarbazones
作者:Chiji Yamazaki
DOI:10.1246/bcsj.53.3289
日期:1980.11
The reaction of 3,4-disubstituted isothiosemicarbazones with α-bromo ketones led to the formation of 4-thiazoline derivatives, the substituents on the sulfur atom being cleaved as bromides. They are identical with the compounds obtained by the condensation of the corresponding thiosemicarbazones, having significantly lower E⁄Z ratios in certain products than in those from thiosemicarbazones. The yields
An investigation of the biological effect of structural modifications of isothiosemicarbazones and their cyclic analogues
作者:E Maccioni、M.C Cardia、S Distinto、L Bonsignore、A De Logu
DOI:10.1016/s0014-827x(03)00154-x
日期:2003.9
Several arylideneisothiosemicarbazones and arylidenehydrazothiazoles have been synthesised to obtain new antimicrobial agents. Their activity against both bacteria and fungi has been tested and some interesting informations about their biological activity have been obtained.