[EN] A NOVEL CATALYTIC PROCESS FOR THE PRODUCTION OF 3,3', 4,4'-TETRAMINOBIPHENYL [FR] NOUVEAU PROCEDE CATALYTIQUE DE PRODUCTION DE 3,3', 4,4'-TETRAMINOBIPHENYLE
reaction of alkyl aryl N-p-tosylsulphilimines with thiophenolate ion was found to afford quantitatively the sulphide that arises by an SN2 like reaction on the carbon atom adjacent to the tri-valent sulphur atom. This reaction was also found to proceed smoothly with such compounds as sulphoxides and sulphones and sulphoxmanes. The kinetic study on the reaction between arylmethyl N-p-tosylsulphilimine
发现烷基芳基N-对甲苯磺酰基亚胺与硫酚盐离子的反应定量地提供了由类似于S N 2的反应在邻近三价硫原子的碳原子上产生的硫化物。还发现该反应在诸如亚砜,砜和亚砜基的化合物中可顺利进行。在DMF中对芳基甲基N-对甲苯磺酰亚氨基亚胺与硫酚酸根离子之间反应的动力学研究表明,该反应是二级的,即对于每个硫酚酸根离子和亚硫亚胺而言是一级的。反应的活化焓和熵为ΔH ≠ = -17·kcal / mol和ΔS ≠分别等于-5·7 eu。取代基在反应中的作用-p -XC 6 H 4 +(- SO 2 C 6 H 4 Y- p)CH 3 + p -ZC 6 H 4 SK与Hammettσ值很好相关,得到ϱ x = + 2 ·4,y = + 1·2,z = -1·8。同时,观察到烷基苯基N-对甲苯磺酰亚胺基亚胺中的大体积烷基显着的空间延迟。此外,根据使用旋光秒的反应的立体化学研究-辛基苯基N-对甲苯磺酰亚胺与硫酚
Enantioselective Nitrene Transfer to Sulfides Catalyzed by a Chiral Iron Complex
作者:Jun Wang、Marcus Frings、Carsten Bolm
DOI:10.1002/anie.201304451
日期:2013.8.12
Iron works: Enantioselectivenitrenetransfer to sulfide was accomplished by a chiraliron(III)/PyBOX catalyst (see scheme). Various sulfimides were thus obtained in high enantioselectivities and yields. Applications of this protocol to the syntheses of enantioenriched sulfoximines and an epoxide were also demonstrated.
Catalytic Chemoselective Sulfimidation with an Electrophilic [Co
<sup>III</sup>
(TAML)]
<sup>−</sup>
‐Nitrene Radical Complex**
作者:Nicolaas P. Leest、Jarl Ivar Vlugt、Bas Bruin
DOI:10.1002/chem.202003566
日期:2021.1.4
sulfimidation of (aryl)(alkyl)‐substituted sulfides with iminoiodinanes, reaching turnover numbers up to 900 and turnover frequencies of 640 min−1 under mild and aerobic conditions. The sulfimidation proceeds in a highly chemoselective manner, even in the presence of alkenes or weak C−H bonds, as supported by inter‐ and intramolecular competition experiments. Functionalization of the sulfide substituent
钴物种PPh 4 [Co III(TAML red)]是一种有效且稳定的催化剂,用于用亚氨基碘代烷磺化(芳基)(烷基)取代的硫化物,达到高达900的周转次数和640 min -1的周转频率在温和有氧条件下。在分子间和分子间竞争实验的支持下,即使在存在烯烃或弱CH键的情况下,亚硫酰亚胺化仍以高度化学选择性的方式进行。可以耐受硫化物取代基在各种供电子和吸电子芳烃以及几个烷基,苄基和乙烯基片段上的官能化作用,最高可达到定量的产品收率。苯基烯丙基硫醚的亚磺酰亚胺化导致[2,3]-σ重新排列,最初形成的亚硫酰亚胺种类得到相应的N-烯丙基-S-苯基-硫羟胺是有吸引力的产品。机理研究表明,实际的氮烯转移至硫化物的过程是通过(先前表征的)亲电子性亚硝基自由基中间体进行的,该中间体通过电子异步过渡态提供亚硫酰亚胺产物,其中从硫化物到亚硝基自由基络合物的SET在形成N-S键之前一个统一的过程。
Highly enantioselective synthesis of dialkyl and alkyl aryl N-tosylsulfimides
作者:Giuseppe Celentano、Stefano Colonna
DOI:10.1039/a708977e
日期:——
Enantiomerically pure S-alkyl-S-[(4S)-4-benzyl-2-oxo-1,3-oxazolidin-3-yl]-N-tosylsulfimides react with Grignard reagents affording dialkyl and alkyl aryl sulfimides in high chemical yield and enantiomeric excess.
作者:Hiroya Takada、Yoshiaki Nishibayashi、Kouichi Ohe、Sakae Uemura、Charlotte P. Baird、Tim J. Sparey、Paul C. Taylor
DOI:10.1021/jo970798d
日期:1997.9.1
A direct catalytic imidation of sulfides to sulfimides with [N-(p-tolylsulfonyl)imino]phenyliodinane (TsN=IPh) using a catalytic amount of copper triflate (CuOTf) has been developed. The reaction proceeds with a wide range of sulfides to give the corresponding sulfimides in 50-83% isolated yields. When the reaction is applied to allylic sulfides, the products are the corresponding sulfonamides produced via [2,3] sigmatropic rearrangement of the initially formed allylic sulfimides. In the presence of a chiral bis(oxazoline) as ligand, asymmetric induction occurs to afford the chiral sulfimides (up to 71% ee) and sulfonamides (up to 58% ee). Chloramine T (TsNClNa) can be used in place of TsN=IPh for asymmetric sulfimidation, but the ee's are much lower. Some mechanistic observations are described.