Aromatic [5,5]‐sigmatropic rearrangement is an appealing protocol for accessing 1,4‐substituted arenes. However, such a protocol has not been well utilized in organicsynthesis because of the difficulties in the synthesis of the substrates, selectivity issues, and limited substrate scope. Described herein is a new [5,5]‐sigmatropic reaction utilizing readily available aryl sulfoxides and allyl nitriles
芳香族[5,5] -sigmatropic重排是一种吸引人的协议,可用于访问1,4-取代的芳烃。但是,由于底物的合成困难,选择性问题以及底物范围有限,这种方案在有机合成中并未得到很好的利用。本文描述的是一种新的[5,5]-σ反应,利用易获得的芳基亚砜和烯丙基腈。该反应具有温和的反应条件,高的化学和区域选择性,出色的官能团相容性以及广泛的底物范围。计算研究表明,反应的成功可归因于重排前体的选择性亲电组装,其中线性-C = C = N-键比竞争性[3,3]更有利于[5,5]-σ重排。 ]-σ重排。
Palladium-Catalyzed Enantioselective C−H Olefination of Diaryl Sulfoxides through Parallel Kinetic Resolution and Desymmetrization
作者:Yu-Chao Zhu、Yan Li、Bo-Chao Zhang、Feng-Xu Zhang、Yi-Nuo Yang、Xi-Sheng Wang
DOI:10.1002/anie.201801146
日期:2018.4.23
example of PdII‐catalyzed enantioselective C−H olefination with non‐chiral or racemic sulfoxides as directing groups was developed. A variety of chiral diaryl sulfoxides were synthesized with high enantioselectivity (up to 99 %) through both desymmetrization and parallel kinetic resolution (PKR). This is the first report of PdII‐catalyzed enantioselective C(sp2)−H functionalization through PKR, and
trans-4-Guanidinomethylcyclohexanecarboxylic acid (trans-GMCHA) aryl esters were synthesized and tested for inhibitory effects on serine proteases, trypsin, chymotrypsin, plasmin, plasma kallikrein, pancreatic kallikrein, urokinase and thrombin. In general, these compounds showed strong inhibitory effects on chymotrypsin, pancreatic kallikrein and urokinase, but the effects varied greatly depending on the substituent in the benzene nucleus. Some of the trans-GMCHA aryl esters strongly inhibited compound 48/80-induced histamine release from mast cells / the p-tert-butylphenyl ester was especially active.
[EN] PROCESS FOR PRODUCING 4,4'-DICHLORODIPHENYL SULFOXIDE<br/>[FR] PROCÉDÉ DE PRODUCTION DE 4,4'-DICHLORODIPHÉNYLE SULFOXIDE
申请人:BASF SE
公开号:WO2020161232A1
公开(公告)日:2020-08-13
The invention relates to a process for producing 4,4'-dichlorodiphenyl sulfoxide comprising: (a) reacting thionyl chloride, chlorobenzene and aluminum chloride in a molar ratio of thionyl chloride : chlorobenzene : aluminum chloride of 1 : (6 to 9) : (1 to 1.5) at a temperature in the range from 0 to below 20°C, forming an intermediate reaction product and hydrogen chloride, (b) mixing aqueous hydrochloric acid and the intermediate reaction product at a temperature in the range from 70 to 110°C to obtain a crude reaction product comprising 4,4'-dichlorodiphenyl sulfoxide, (c) separating the crude reaction product into an organic phase comprising the 4,4'-dichlorodiphenyl sulfoxide and an aqueous phase, (d) washing the organic phase with an extraction liquid.