我们报告了一种基于均裂取代反应 S H 2' 捕获短寿命自由基的新通用方法。这种通过添加或自由基-自由基交叉偶联与传统自由基捕获的背离导致了新方法的高灵敏度、详细的结构信息和普遍适用性。该方法中的自由基陷阱是具有氮氧离去基团的末端烯烃(例如, 烯丙基-TEMPO 衍生物)。因此,捕获过程会产生稳定的产物,这些产物可以储存并随后通过质谱 (MS) 进行分析,质谱 (MS) 得到了同位素交换、串联 MS 和高效液相色谱-MS 等成熟技术的支持。新方法应用于液相和气相中的一系列模型自由基反应,包括光氧化还原催化的硫醇-烯反应和烯烃臭氧分解。在复杂的反应混合物中观察到前所未有的自由基中间体范围,提供了新的机理见解。可以在与大气化学相关的浓度下检测到气相自由基。
An Insight of the Reactions of Amines with Trichloroisocyanuric Acid
作者:Lidia De Luca、Giampaolo Giacomelli
DOI:10.1055/s-2004-830896
日期:——
as chlorinating agents and oxidants. 1 Their properties are similar to those of N-chloroamines, which, however, are less stable. A few of them are also common- ly used as chlorinating reagents and oxidants in organic synthesis: since chloroamines are easier to handle than chlorine gas or metal hypochlorites, they are widely used in organic synthesis in addition to their use in the purifi- cation of water
Iron-Catalyzed Amidation of Aldehydes with<i>N</i>-Chloroamines
作者:Andrea Porcheddu、Lidia De Luca
DOI:10.1002/adsc.201200659
日期:2012.11.12
A new direct conversion of aldehydes to amides has been realized, in the presence of iron(III) chloride as a catalyst and using tert-butyl hydroperoxide (TBHP) as an oxidant. Both aliphatic and aromatic aldehydes were successfully reacted with variously mono- and di-substituted N-chloroamines. The methodology has a wide substrate scope, uses cheap and easily available reagents and is characterized
Enantiospecific Total Synthesis of (+)-Tanikolide via a Key [2,3]-Meisenheimer Rearrangement with an Allylic Amine <i>N</i>-Oxide-Directed Epoxidation and a One-Pot Trichloroisocyanuric Acid <i>N</i>-Debenzylation and <i>N</i>-Chlorination
作者:Yangla Xie、Moran Sun、Hang Zhou、Qiwei Cao、Kaige Gao、Changling Niu、Hua Yang
DOI:10.1021/jo4016437
日期:2013.10.18
The enantiospecific totalsynthesis of the δ-lactonic marine natural product (+)-tanikolide (1), isolated from Lyngbya majuscula, was achieved using a [2,3]-Meisenheimer rearrangement as the key reaction. During this rearrangement, we discovered that the allylic amine N-oxide could direct the m-CPBA double-bond epoxidation to the syn position. The resulting syn product 8 underwent epoxide ring opening
Titanium-Mediated Amination of Grignard Reagents Using Primary and Secondary Amines
作者:Timothy J. Barker、Elizabeth R. Jarvo
DOI:10.1002/anie.201103700
日期:2011.8.29
N‐chlorosuccinimide (NCS) was employed as the oxidant in the synthesis of aniline derivatives using the title transformation (see scheme). Functionalization was well tolerated on both the amine and Grignard reagent. An androgen receptor agonist and several analogues were synthesized to demonstrate the utility of this method.
Copper-Catalyzed Amination of Silyl Ketene Acetals with <i>N</i>-Chloroamines
作者:Tomoya Miura、Masao Morimoto、Masahiro Murakami
DOI:10.1021/ol302331k
日期:2012.10.19
A copper(I)/2,2′-bipyridyl complex catalyzes an amination reaction of silyl ketene acetals with N-chloroamines, presenting a newpreparativemethod of α-amino esters.