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
In the presence of ozone, nitrogen dioxide rapidly reacts with acetanilides ortho-selectively at low temperatures, giving a high proportion of ortho-nitro derivatives in good yields.
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
Abstract Nitration of N-acetyl anilides using a simple combination of AgNO3 and K2S2O8 as a stable nitro source and an oxidant, respectively, was explored. The reaction was practical to operate and proceeded under considerably mild reaction conditions (reflux in acetonitrile) within acceptable reaction time (6 h). The para-substituted N-acetyl anilides gave only ortho-nitrated products in moderate
摘要 探索了使用AgNO 3和K 2 S 2 O 8的简单组合分别作为稳定的硝基源和氧化剂对N-乙酰苯胺的硝化。该反应在可接受的反应时间(6小时)内可在相当温和的反应条件(在乙腈中回流)下实际操作和进行。对位取代的N-乙酰苯胺仅产生邻位硝化产物,产率适中(产率 30-63%)。邻位、间位或未取代的N-乙酰苯胺产生硝化产物的混合物(30-72%的总产率),优先在对位而不是邻位(邻位:对位;1.0:1.1-1.0:2.8)。
Suzuki, Hitomi; Tatsumi, Atsuo; Ishibashi, Taro, Journal of the Chemical Society. Perkin transactions I, 1995, # 4, p. 339 - 344