TiCl<sub>4</sub> mediated facile synthesis of 1,3,4-oxadiazoles and 1,3,4-thiadiazoles
作者:Lin Zhang、Yu Yu、Qiang Tang、Jianyong Yuan、Dongzhi Ran、Binghua Tian、Tao Pan、Zongjie Gan
DOI:10.1080/00397911.2019.1700521
日期:2020.2.1
Abstract An efficient method for the synthesis of 2,5-disubstituted 1,3,4-oxadiazoles and 1,3,4-thiadiazoles has been developed. Various hydrazides or thionyl hydrazides readily react with DMA derivatives in the presence of TiCl4 as a catalyst to afford the desired products. This protocol provides a simple and economical procedure that affords the target products with good yields and wide substrate
Synthesis, Oxidation and Dehydro- genation of Cyclic N,O- and N,S-Acetals. Part 1. Transformation of N,S-Acetals: 3-Acyl-1,3,4-thiadiazolines
作者:László Somogyi
DOI:10.3987/com-04-10137
日期:——
Aldehyde and ketone thiosemicarbazones are synthesized and cyclized into 3-acyl-1,3,4-thiadiazolines under acylating conditions. Reactions of the 2-monosubstitutedheterocycles with oxidizing and dehydrogenating agents (KMnO 4 or for the first time with CAN, DDQ, IBDA) lead to the formation of thiadiazoles. CAN oxidation of 2,2-disubstituted 3-acyl-1,3,4-thiadiazolines regenerates the parent ketones
醛和酮缩氨基硫脲在酰化条件下合成并环化成 3-酰基-1,3,4-噻二唑啉。2-单取代杂环与氧化剂和脱氢剂(KMnO 4 或首次与 CAN、DDQ、IBDA)反应导致形成噻二唑。2,2-二取代 3-acyl-1,3,4-thiadiazolines 的 CAN 氧化可有效地再生母体酮。
Palladium(II) benzisothiazolinate (bit) complexes with amino-, acetylamino-, heterocyclic and phosphine co-ligands. Crystal structure of [Pd(bit)2(κ2-dppe)]·2EtOH
作者:Subhi A. Al-Jibori、Birgul S.M. Ahmed、Safaa A. Ahmed、Ahmet Karadağ、Harry Schmidt、Christoph Wagner、Graeme Hogarth
DOI:10.1016/j.ica.2015.07.005
日期:2015.9
Abstract A series of square-planar palladium(II) benzisothiazolinate (bit) of the general type [Pd(bit)2L2] have been prepared and characterized by analytical and spectroscopic methods. Two synthetic routes have been employed, namely reactions of [Pd(bit)2]·H2O with two equivalents of ligands (L = amine, amide, phosphine) or nucleophile displacement of chloride by benzisothiazolinate starting from
Sulfamic Acid–Mediated, Efficient, One-Pot Synthesis of Novel 5-Substituted 1,3,4-Thiadiazol-2-ylcarbamoyl Aliphatic Amide Acid Derivatives and Facile Synthesis of Cyclic Amides
作者:R. B. Toche、R. A. Janrao、S. A. Gangurde、P. S. Nikam
DOI:10.1080/00397911.2012.719256
日期:2013.9.17
Abstract Convenient and efficientone-pot syntheses of 5-substituted-1,3,4-thiadiazol-2-ylcarbamoyl aliphatic amide acid derivatives were described and developed using sulfamic acid catalyst. Thiosemicarbazide and substituted triethylorthoester and cyclic/alicyclic anhydride were efficiently condensed using sulfamic acid to furnish 5-disubstituted-1,3,4-thiadiazol-2-ylcarbamoyl aliphatic acid and amide