Directed oxidative coupling of thiols in the synthesis of unsymmetrical disulfides
作者:D. A. Burmistrova、I. V. Smolyaninov、N. T. Berberova
DOI:10.1007/s11172-020-2860-1
日期:2020.5
Oxidative coupling of two different thiols bearing aliphatic, alicyclic, aromatic, and hetero-aromatic moieties promoted by mild oxidizing agents, viz. , stericallyhindered o -benzo(imino)-quinones, carried out in N -methylpyrrolidone at room temperature led to unsymmetrical disulfides. Among the studied oxidizers, the most active was 3,6-di- tert -butyl- o -benzoquinone, which, in contrast to 3,5-di-
Substituted o-Aminophenols as Redox-Mediators in the Thiol Oxidation to Unsymmetrical Disulfides
作者:Daria A. Burmistrova、Andrey Galustyan、Ivan V. Smolyaninov、Nadezhda T. Berberova
DOI:10.1149/1945-7111/abfe43
日期:2021.5.1
A number of substituted o-aminophenols has been investigated as redox mediators of the thiol oxidation to disulfides. The electrooxidation of o-aminophenols leads to the corresponding o-iminobenzoquinones. These compounds react with thiols in the solution with a formation of disulfides. It was established that the use of 4,6-di-tert-butyl-2-(tert-butylamino)phenol as a redox mediator can reduce the
One-pot synthesis of unsymmetrical disulfides using 1-chlorobenzotriazole as oxidant: Interception of the sulfenyl chloride intermediate
作者:Nashia Stellenboom、Roger Hunter、Mino R. Caira
DOI:10.1016/j.tet.2010.02.077
日期:2010.4
is described for unsymmetricaldisulfide synthesis from two different thiols using 1-chlorobenzotriazole (BtCl) as oxidant. The mechanism of the coupling involves in situ trapping of the sulfenyl chloride intermediate R1SCl by nucleophilic benzotriazole (BtH) to form R1SBt, which protects R1SCl from forming the homodimer R1SSR1. The methodology is applicable to all types of thiol (aliphatic, aromatic
描述了一种高产,低温的一锅法,用于使用1-氯苯并三唑(BtCl)作为氧化剂由两种不同的硫醇合成不对称的二硫键。偶联的机制包括通过亲核苯并三唑(BtH)原位捕获亚磺酰氯中间体R 1 SCl形成R 1 SBt,从而保护R 1 SCl避免形成同型二聚体R 1 SSR 1。该方法适用于所有类型的硫醇(脂族,芳族,杂芳族),并为脂族-脂族偶联开发了一种变体。差异性的N-保护的半胱氨酸偶合,以高收率(90%)提供不对称的胱氨酸衍生物,该模型可作为含半胱氨酸的肽单分子间偶联形成肽二硫键异二聚体的模型。由于条件温和,因此注意到芳香族-芳香族二硫化物合成中的交换最少。
Inexpensive, One-Pot Synthesis of Unsymmetrical Disulfides Using 1-Chlorobenzotriazole
作者:Roger Hunter、Mino Caira、Nashia Stellenboom
DOI:10.1021/jo060693n
日期:2006.10.1
A new synthesis of unsymmetrical disulfides is described. The reaction of a thiol R1SH with 1-chlorobenzotriazole (BtCl) at −78 °C in DCM affords a high-yielding conversion to R1SBt without appreciable formation of the symmetrical disulfide R1SSR1. R1SBt is then reacted with R2SH to form the unsymmetrical disulfide in a one-pot sequence with green character that avoids the use of toxic and harsh oxidizing
Allicin and derivativesthereof inhibit the CAC1 cysteine proteases falcipain 2, rhodesain, cathepsin B and L in the low micromolar range. The structure–activity relationship revealed that only derivatives with primary carbon atom in vicinity to the thiosulfinate sulfur atom attacked by the active-site Cys residue are active against the target enzymes. Some compounds also show potent antiparasitic