Palladium-Catalyzed Thiocarbonylation of Aryl, Vinyl, and Benzyl Bromides
作者:Mia N. Burhardt、Andreas Ahlburg、Troels Skrydstrup
DOI:10.1021/jo5009965
日期:2014.12.19
A catalytic protocol for synthesis of thioesters from aryl, vinyl, and benzyl bromides as well as benzyl chlorides was developed using only stoichiometric amounts of carbon monoxide, produced from a solid CO precursor inside a two-chamber system. As a catalytic system, the combination of bis(benzonitrile) palladium(II) chloride and Xantphos furnished the highest yields of the desired compounds, along
Lithium-Catalyzed Thiol Alkylation with Tertiary and Secondary Alcohols: Synthesis of 3-Sulfanyl-Oxetanes as Bioisosteres
作者:Rosemary A. Croft、James J. Mousseau、Chulho Choi、James A. Bull
DOI:10.1002/chem.201705576
日期:2018.1.19
inexpensive Li catalyst enables chemoselective C-OH activation and thiol alkylation. Oxetane sulfides are formed from various thiols providing novel motifs in new chemical space and specifically as bioisosteres for thioesters due to their similar shape and electronic properties. Under the same conditions, various π-activated secondary and tertiary alcohols are also successful. Derivatization of the oxetane
3-硫烷基-氧杂环丁烷被认为是硫酯或苯硫醚的有前途的新型生物电子等排替代品。一种温和且廉价的 Li 催化剂以 oxetan-3-ols 为原料,能够实现化学选择性 C-OH 活化和硫醇烷基化。氧杂环丁烷硫化物由各种硫醇形成,在新的化学空间中提供新颖的基序,并且由于其相似的形状和电子特性,特别是作为硫酯的生物等排体。在相同条件下,各种π活化的仲醇和叔醇也获得了成功。氧杂环丁烷硫化物连接体的衍生化提供了更多新颖的氧杂环丁烷类别和结构单元。氧杂环丁烷化合物与选定的羰基和亚甲基类似物的关键物理化学性质的比较表明,这些基序适合纳入药物发现工作。
CsF-Celite, an Efficient Solid State Reagent for the Syntheses of Thioesters and Thioethers
作者:Syed T. A. Shah、Khalid M. Khan、Hidayat Hussain、Safdar Hayat、Wolfgang Voelter
DOI:10.1007/s00706-005-0351-6
日期:2005.9
Coupling reactions of a number of aliphatic, aromatic, and heterocyclic compounds bearing an acidic hydrogen atom attached to sulfur, with alkyl, acyl, benzyl, or benzoyl halides in acetonitrile with cesium fluoride-Celite are described. This procedure is convenient, efficient, and practical for the preparation of thioethers and thioesters.
Visible-Light-Mediated Cross Dehydrogenative Coupling of Thiols with Aldehydes: Metal-Free Synthesis of Thioesters at Room Temperature
作者:Vishal Jyoti Roy、Partha Pratim Sen、Sudipta Raha Roy
DOI:10.1021/acs.joc.1c02111
日期:2021.12.3
is also found to be scalable with good efficiency. Mechanistic investigations reveal that under this photochemical condition, the formation of acyl radical can be achieved from aldehyde. This acyl radical was further intercepted with an intermediate disulfide, generated in situ via the dehydrogenation of thiol to give the desired thioester. Moreover, disulfides, which are relatively easier to handle
硫酯在生物系统中起着至关重要的作用,是有机合成的重要组成部分。在此,Eosin Y 和 TBHP 介导的原料醛和硫醇之间的光化学交叉脱氢偶联 (PCCDC) 已被描述在室温下合成硫酯。该硫酯化方案顺利进行,通过烷基/芳基醛与各种烷基/芳基硫醇的合适 PCDC 以良好至极好的收率得到所需产物,并生成水和tBuOH 作为绿色副产品。还发现该方法具有良好的可扩展性。机理研究表明,在这种光化学条件下,醛可以形成酰基自由基。该酰基进一步被中间体二硫化物拦截,中间体二硫化物通过硫醇的脱氢原位生成,得到所需的硫酯。此外,相对更容易处理的二硫化物在优化的反应条件下也提供了良好的收率。该协议进一步扩展到更具挑战性的醇到硫酯的直接转化。
An alternative approach towards the syntheses of thioethers and thioesters using CsF–Celite in acetonitrile
作者:Syed Tasadaque Ali Shah、Khalid Mohammed Khan、Angelica Martinez Heinrich、Wolfgang Voelter
DOI:10.1016/s0040-4039(02)02028-2
日期:2002.11
It has been found that syntheses of thioethers and thioesters of aliphatic, aromatic and heterocyclic compounds, bearing thiol groups, can be accomplished with alkyl, acyl, benzyl or benzoyl halides in acetonitrile and cesium fluoride–Celite. In this manner, compounds like ethanethiol, 1-pentanethiol, thiophenol, 4-methoxythiophenol, 4-nitrothiophenol, and 2-mercaptobenzoxazole, 2-mercaptobenzothiazole