Behaviors of N-(substituted thio)phthalimides, N-(substituted thio)succinimides, and N-(substituted thio)isatins toward some nucleophiles.
作者:MITSURU FURUKAWA、TCHIAKI SUDA、SEIGORO HAYASHI
DOI:10.1248/cpb.24.1708
日期:——
New compounds of N-(substituted thio) isatins (III) were synthesized and reactions with several nucleophiles were examined in comparison with the reaction using N-(substituted thio) phthalimides (I) and N-(substituted thio) succinimides (II) : All of I, II, and III reacted with organometallic compounds, cyanide ion, and trichloromethyl carbanion to give sulfides (IV), thiocyanates (V), and trichloromethyl sulfides (VI) respectively. Different from I and II, however, the reaction of III with amines afforded 3-amino-1-substituted thio-3-hydroxy-2-oxo-indoles (X), with no formation of any sulfenamides anticipated.
合成了新化合物 N-(取代硫)异恶唑(III),并对与几种核外基团的反应进行了研究,以与使用 N-(取代硫)邻苯二甲酰亚胺(I)和 N-(取代硫)琥珀酰亚胺(II)的反应进行比较:I、II 和 III 均与有机金属化合物、氰离子和三氯甲基碳负离子反应,分别生成硫化物(IV)、硫氰酸盐(V)和三氯甲基硫化物(VI)。然而,与 I 和 II 不同,III 与胺发生反应,生成 3-氨基-1-取代硫-3-羟基-2-氧代喹啉(X),未观察到任何预期的亚硫酰胺形成。
NFSI-catalyzed S S bond exchange reaction for the synthesis of unsymmetrical disulfides
作者:Mengjie Song、Qingyue Hu、Zheng-Yi Li、Xiaoqiang Sun、Ke Yang
DOI:10.1016/j.cclet.2021.12.073
日期:2022.9
The metal-free SS bond exchangereaction of symmetrical disulfides catalyzed by NFSI is described. This novel protocol provides a facile and efficient approach to accessing important unsymmetrical disulfides. Furthermore, this strategy could also be utilized in the late-stage functionalization of amino acids, drugs, and natural products. The broad substrate scope, good functional group tolerance and
Unsymmetrical disulfides were readily prepared in high yields by successive treatment of silver thiolates initially with 2,4-dinitrobenzenesulfenyl chloride in acetonitrile at 0 °C and then with the second thiols and silver acetate in DMF at room temperature.
首先在 0 °C 下用 2,4-二硝基苯磺酰氯在乙腈中连续处理硫代银,然后在室温下用第二个硫代银和乙酸银在 DMF 中连续处理硫代银,很容易就能以高产率制备出不对称的二硫化物。
Metal‐Free and NBS‐Mediated Direct Thiol‐Disulfide Exchange Reaction to Access Unsymmetrical Disulfides
作者:Ke Yang、Qingyue Hu、Qin Li、Junxiang Liu、Zheng‐Yi Li、Bijin Li、Xiaoqiang Sun
DOI:10.1002/ejoc.202300394
日期:2023.8.7
NBS-mediated direct thiol-disulfide exchange reaction has been described for the construction of various unsymmetrical disulfides at room temperature under metal-free conditions. More than 30 examples of unsymmetrical disulfides were isolated in good yields (up to 93 %). Captopril, an angiotensin-converting enzyme inhibitor, was able to form the corresponding unsymmetrical disulfide in 61 % yield.
[EN] BIO-RELATED SUBSTANCE MODIFIED BY MULTIFUNCTIONALIZED POLYETHYLENE GLYCOL DERIVATIVE<br/>[FR] SUBSTANCE D'ORIGINE BIOLOGIQUE MODIFIÉE PAR UN DÉRIVÉ DU POLYÉTHYLÈNEGLYCOL MULTIFONCTIONNALISÉ<br/>[ZH] 一种多官能化聚乙二醇衍生物修饰的生物相关物质