使用由84.5%的TiO 2和15.5%的[Ti 4 H 11(PO 4)9组成的新开发的固体酸催化剂,已通过H 2 O 2或HNO 3将多种有机硫化合物选择性地氧化为相应的亚砜。]· n H 2 O(n = 1-4)。在易碎基团(例如-CN,-C)存在下,硫化物的化学选择性氧化C –,– CHO或–OH以及底物(如苯并噻唑,糖基硫醚和二苯并噻吩)的亚硫酸化是该协议的一些重要属性。在目前的实验条件下,硝酸比过氧化氢具有相对更好的选择性。
Metal-free oxidative coupling of alkyl chlorides with thiols: An efficient access to sulfoxides
作者:Qian Liu、Xiaoqian Zhao、Feng Xu、Gaoqiang Li
DOI:10.1016/j.tetlet.2019.151492
日期:2020.2
An efficient and step-economical access to sulfoxides from thiols and alkyl halides in the presence of I2O5 and DBU via direct oxidative couplings is described here. It is the first case that combined Williamson sulfide synthesis and subsequent sulfide oxidation into one step manipulation for sulfoxides preparation. This protocol features wide substrate scope, mild and metal-free conditons, the use
本文描述了在I 2 O 5和DBU存在下,通过直接氧化偶合从硫醇和烷基卤化物高效,经济地获取亚砜的方法。这是第一种将威廉姆森硫化物合成和随后的硫化物氧化结合起来一步一步进行亚砜制备的情况。该协议具有广泛的底物范围,温和无金属的条件,使用天然丰富的起始原料以及避免过度氧化的特点。
Transfer of Electrophilic NH Using Convenient Sources of Ammonia: Direct Synthesis of NH Sulfoximines from Sulfoxides
作者:Marina Zenzola、Robert Doran、Leonardo Degennaro、Renzo Luisi、James A. Bull
DOI:10.1002/anie.201602320
日期:2016.6.13
valuable motifs for drug discovery. The protocol employs readily available sources of nitrogen without the requirement for either preactivation or for metal catalysts. Mixing ammonium salts with diacetoxyiodobenzene directly converts sulfoxides into sulfoximines. This report describes the first example of using of ammonia sources with diacetoxyiodobenzene to generate an electrophilic nitrogen center.
Nucleophilic attack of 2-sulfinyl acrylates: A mild and general approach to sulfenic acid anions
作者:Suneel P. Singh、Jennifer S. O'Donnell、Adrian L. Schwan
DOI:10.1039/b917217c
日期:——
An increasing number of reactions of sulfenic acidanions are being demonstrated in the literature. As such, mild, general and reliable means for the generation of sulfenates are due. In the current paper, an addition/elimination of 2-sulfinyl acrylates using various nucleophiles is demonstrated and evaluated as a protocol for alkane- and arenesulfenate generation. Cyclohexanethiolate, methoxide and
Conformational Analysis of Acyclic α‐Fluoro Sulfur Motifs
作者:Nathalie Erdeljac、Christian Mück‐Lichtenfeld、Constantin G. Daniliuc、Ryan Gilmour
DOI:10.1002/chem.202003361
日期:2020.10.27
of sulfur, a conformationalanalysis of α‐fluoro sulfides, sulfoxides, and sulfones, would be instructive in order to delineate the non‐covalent interactions that manifest themselves in structure. A combined crystallographic and computational analysis demonstrates the importance of hyperconjugative donor‐acceptor interactions in achieving acyclic conformational control. The conformational disparity in
含有α-氟硫基序[RS(O) n CH 2 F]的生物活性小分子在制药和农化领域的出现频率越来越高。突出的例子包括抗哮喘药物 Flovent ®和苯基吡唑类杀虫剂吡虫啉。鉴于这些结构单元在生物活性小分子设计中的流行,以及硫的不同氧化态,α-氟硫化物、亚砜和砜的构象分析对于描述所表现出的非共价相互作用将具有指导意义。本身在结构上。结合晶体学和计算分析证明了超共轭供体-受体相互作用在实现无环构象控制中的重要性。α-氟亚砜的顺式和反式非对映异构体的构象差异尤其值得注意。
[EN] ION PAIR CATALYSIS OF TUNGSTATE AND MOLYBDATE<br/>[FR] CATALYSE PAR PAIRE D'IONS DE TUNGSTATE ET DE MOLYBDATE
申请人:UNIV NANYANG TECH
公开号:WO2017164813A1
公开(公告)日:2017-09-28
D The present invention relates to ion pair catalysts (I) comprising the cationic bisguanidinium ligand (A) and diperoxomolybdate anion (B). The present invention also relates to ion pair catalysts (III) comprising the cationic bisguanidinium ligand (C) and peroxotungstate anion (D). It further relates to the use of the said catalysts in the manufacture of enantiomerically enriched sulfoxides.