isocyanates via base-induced β-elimination of haloform N-monosubstituted trihaloacetamides is described. The rate of reaction exhibits a strong dependence on the nature of the trihalomethyl group. Thus, while the reaction of tribromoacetamides proceeds at room temperature and the reaction of trichloroacetamides requires heating in polar solvents, no reaction could be observed for any of the corresponding
Photolysis of trichloroacetamide in nondegassed methanol gave methyl oxanilate (13–44%), along with carbamate (3–20%) and amine (4–12%). Similar irradiation of other trichloroacetyl derivatives of aliphatic ketone, aldehyde, and acetate afforded only radical product. The results are interpreted in terms of the mechanism involving electron transfer of the radical pair.
2-Oxazolidones from Glycidyl Ether Reactions with Acid Amides
作者:Yoshio Iwakura、Shin-ichi Izawa
DOI:10.1246/bcsj.39.2490
日期:1966.11
The reaction between acid amides and aryl glycidyl ethers was carried out using tertiary amine as the catalyst. 2-Oxazolidone derivatives were obtained by the reaction of trichloroacetanilide or trifluoroacetanilide with aryl glycidyl ether. Acyl migration occurred in the reaction of acetanilide with phenyl glycidyl ether.
Heller, Justus Liebigs Annalen der Chemie, 1904, vol. 332, p. 255,277
作者:Heller
DOI:——
日期:——
Microwave Promoted Environmentally Benign Synthesis of 2-Aminobenzothiazoles and Their Urea Derivatives
作者:Zheng Li、Shuxiu Xiao、Guoqiang Tian、Anguo Zhu、Xu Feng、Jing Liu
DOI:10.1080/10426500701578506
日期:2008.4.18
2-Aminobenzothiazoles were efficiently synthesized using stable, crystalline tetrabutylammonium tribromide instead of toxic, corrosive liquid bromine under solvent-free and microwave irradiation condition. Furthermore, benzothiazol-2-ylureas were synthesized in good to high yield by reactions of 2-aminobenzothiazoles with N-trichloroacetanilides, which were used as a substitute for toxic, unstable isocyanates, under microwave irradiation condition. This protocol has advantages of no utilization of hazardous chemicals, rapid reaction rate, high yield, and easy work-up procedure.