Die Bromierung einiger 2-Anilino-5-aryl-1,3,4-oxadiazole Heterocyclische Verbindungen。14. 手套
摘要:
Es wurden 2-Anilino-5-aryl-1,3,4-oxadiazole in Essigsäure bromiert, wobei nur ein Bromatom in Parastellung zurAromatischen Aminogruppe eingeführt werden konnte。Die an dieser N-Gruppe acetylierten Verbindungen widestanden der Bromierung。Daraus wird geschlossen, daß der 5-Phenyl-1,3,4-oxadiazol-Rest elektronenziehenden Charakter hat。
Tetrazoles: LV. Perparation of 2-anilino-5-aryl(hetaryl)-1,3,4-oxadiazoles from 5-substituted tetrazoles under microwave activation
作者:Yu. A. Efimova、G. G. Karabanovich、T. V. Artamonova、G. I. Koldobskii
DOI:10.1134/s1070428009080211
日期:2009.8
In reaction of 5-aryl(hetaryl)tetrazoles with phenyl isocyanate under the conditions of microwave activation the corresponding 2-anilino-5-aryl(hetaryl)-1,3,4-oxadiazoles formed in high yields. The application of the microwave activation fourfold reduced the reaction time.
Prabhu, Girish; Madhu, Chilakapathi; Sureshbabu, Vommina V., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2014, vol. 53, # 7, p. 865 - 870
作者:Prabhu, Girish、Madhu, Chilakapathi、Sureshbabu, Vommina V.
DOI:——
日期:——
Synthesis of 2-amino-1,3,4-oxadiazoles from isoselenocyanates via cyclodeselenization
作者:Yuanyuan Xie、Junli Liu、Ping Yang、Xiangjun Shi、Jianjun Li
DOI:10.1016/j.tet.2011.05.100
日期:2011.7
An efficient one-pot method to access 2-amino-1,3,4-oxadiazoles from isoselenocyanates and hydrazides or dihydrazides was developed via cyclodeselenization. Without any harsh reagents, various 2-amino-1,3,4-oxadiazoles were obtained in considerably high yields (82%-97%) and purities (>99%) directly with simple crystallization in ethanol. And the formed precipitated Se powder during the reaction could be recycled for preparation of isoselenocyanates efficiently. A plausible mechanism is proposed for the formation of the target products. (C) 2011 Elsevier Ltd. All rights reserved.
EL-BARBARY A. A.; ANWAR M.; GHATTAS A. A.; HASHEM A. F., REV. ROUM. CHIM., 1981, 26, NO 3, 449-456
作者:EL-BARBARY A. A.、 ANWAR M.、 GHATTAS A. A.、 HASHEM A. F.