Iron(III)-Catalyzed Halogenations by Substitution of Sulfonate Esters
作者:Nuria Ortega、Andrés Feher-Voelger、Margarita Brovetto、Juan I. Padrón、Victor S. Martín、Tomás Martín
DOI:10.1002/adsc.201000740
日期:2011.4.18
A novel halogenation reaction from sulfonates catalyzed by iron(III) is described. The reaction can be performed as a stoichiometric or a catalytic version. This reaction provides a convenient strategy for the efficient access to structurally diverse secondary chlorides, bromides and iodides. The stereochemical course of the reaction is governed by the substrate and the experimental conditions. Secondary
Compounds of the formula I:
or a pharmaceutical salt thereof,
wherein X, Ar
1
, R1, R
2
, R
3
, R
4
, R
5
, R
6
and R
7
are as defined herein. Also disclosed are methods of making the compounds and using the compounds for treatment of inflammatory diseases such as arthritis.
A Remarkably Efficient Markovnikov Hydrochlorination of Olefins and Transformation of Nitriles into Imidates by Use of AcCl and an Alcohol
作者:Veejendra�K. Yadav、K.�Ganesh Babu
DOI:10.1002/ejoc.200400591
日期:2005.1
mixing AcCl with EtOH brings about Markovnikovhydrochlorination of olefins in excellent yields. The products are isolated in states of high purity simply by removal of the volatile components under reduced pressure. Further, nitriles are transformed into imidate hydrochlorides on similar treatment with AcCl and an alcohol. This procedure for nitrile-imidate transformation is much more efficient than
通过将 AcCl 与 EtOH 混合产生的 HCl 以极好的收率进行烯烃的马尔科夫尼科夫氢氯化反应。只需在减压下除去挥发性成分,就可以分离出高纯度的产品。此外,腈在用 AcCl 和醇进行类似处理后转化为亚胺酸盐盐酸盐。这种腈-亚胺酸酯转化过程比以前使用的过程更有效,其中包括将 HCl 气体连续通入腈在溶剂(如 Et 2 O 或苯和醇)中的溶液中,直到吸收了等量。
New Chiral Dichlorophosphines and Their Use in the Synthesis of Phosphetane Oxides and Phosphinic Chlorides
(Et(2)N)(2)PCl. Two applications of these compounds to synthetic asymmetric organophosphorus chemistry have been examined: their reactions with 2,3,3-trimethylbutene and AlCl(3) afford either P-chiral phosphetane oxides or, in the presence of gaseous HCl, P-chiral phosphinic chlorides with moderate to high diastereoselectivity.
An Efficient Route to Alkyl Chlorides from Alcohols Using the Complex TCT/DMF
作者:Lidia De Luca、Giampaolo Giacomelli、Andrea Porcheddu
DOI:10.1021/ol017168p
日期:2002.2.1
[reaction: see text] Efficient conversion of alcohols and beta-amino alcohols to the corresponding chlorides (and bromides) can be carried out at room temperature in methylene chloride, using 2,4,6-trichloro[1,3,5]triazine and N,N-dimethyl formamide. This procedure can also be applied to optically active carbinols.