Transition-metal-free mono- or dinitration of protected anilines
作者:Enrui Dai、Yongrui Dong、Rui Kong、Guangzhang Liu、Ying Dong、Qiong Wu、Deqiang Liang、Yinhai Ma
DOI:10.1080/00397911.2020.1752730
日期:2020.6.2
Abstract An amide-assisted arene nitration is presented, and both mono- and dinitration of protected anilines could be effected by using NaNO2 and NaNO3 as the mono- and bisnitrating agents, respectively. This divergent synthesis is transition-metal- and acid-free, and features a broad substrate scope, low cost, and ortho–para selectivity. Graphical Abstract
Intermediates and dyestuffs for synthetic fibres. Part II. Halogeno-2-aminobenzothiazoles
作者:F. H. Jackson、A. T. Peters
DOI:10.1039/j39690000268
日期:——
The preparation of 4-, 5-, 6-, and 7-chloro-, -bromo-, and -fluoro-2-aminobenzothiazoles is described. Ultraviolet and infrared absorption spectra of these, and of a series of halogenophenylthioureas, are recorded.
An efficient and one-pot synthetic method for the regioselective ortho-nitration of the N-phenyl carboxamides and primary anilines has been developed by using bismuth nitrate and aceticanhydride as the nitrating reagents. Reaction proceeds at room temperature and results in corresponding ortho-nitrated products in moderate to excellent yields. This method provides an operationally simple, regioselective