Oxalic Acid Monothioester for Palladium-Catalyzed Decarboxylative Thiocarbonylation and Hydrothiocarbonylation
作者:Bin Zhao、Yao Fu、Rui Shang
DOI:10.1021/acs.orglett.9b03701
日期:2019.12.6
hydrothiocarbonylation of unsaturated carbon–carbon bonds at room temperature with high chemo- and regioselectivity. The reaction is applicable to the synthesis of cysteine-derived thioesters, thus allowing chemical modification of cysteine-containing peptides. Decarboxylation of OAM proceeds through oxidative addition of Pd(0) to the acyl–S bond, which accounts for the very mild reaction conditions
Generation of Alkyl Radicals from Thiols via Zinc Thiolates: Application for the Synthesis of
<i>gem</i>
‐Difluorostyrenes
作者:Vyacheslav I. Supranovich、Vitalij V. Levin、Vladimir A. Kokorekin、Alexander D. Dilman
DOI:10.1002/adsc.202100088
日期:2021.6.8
Reaction of thiols with α-(trifluoromethyl)styrenes under photocatalytic conditions leading to desulfurative allylic fluorine substitution is described. The reaction is performed by treatment of thiols with benzyl zinc chloride to generate zinc thiolates followed by visible light induced desulfurization by means of triphenylphosphine. Radicals formed after the C−S bond cleavage react with the double
Untersuchungen an 1,3-Thiazinen, 29. Mitt. Über die Eignung von Cysteinderivaten zur Synthese 5-aminosubstituierter Tetrahydro-1,3-thiazine
作者:Wolfgang Hanefeld
DOI:10.1002/ardp.19853180415
日期:——
La reaction de N-benzoyl cysteinate d'ethyle avec les isothiocyanates et isocyanate de phenyle ne conduit pas aux composes du titre mais aux derives S-phenylthiocarbamoyl et S-phenylcarbamoyl correspondants
La 反应 de N-苯甲酰半胱氨酸 d'ethyle avec les 异硫氰酸酯和异氰酸酯 de phenylene 管道 pas aux 组成 du titre mais aux 衍生 S-苯基硫代氨基甲酰基和 S-苯基氨基甲酰基对应物
Highly selective acylations using a biomimetic strategy
作者:Alan W. Schwabacher、Richard A. Bychowski
DOI:10.1016/s0040-4039(00)77663-5
日期:1992.1
Rapid, high yield acylation of thiol-bearing amines by one equivalent of thioacid may be carried out at 1 mM in the presence of large excesses of other primary amines. Silver ion, known to activate thoacids toward nucleophilic attack, simultaneously also serves as a binding site to deliver a thiol-tethered amine. An interesting dependence of yields and selectivity on [Ag+] was found, as well as a significant
在大量过量的其他伯胺存在下,可以在1 m M上用1当量的硫氰酸快速,高产率地酰化含硫醇的胺。众所周知,银离子可激活硫酸向亲核攻击,同时也可作为结合位点,以传递硫醇键合的胺。发现了产率和选择性对[Ag +]的有趣依赖关系,以及氯化物的显着影响。
Synthesis of S-linked carbohydrate analogues via a Ferrier reaction
作者:David Ellis、Sarah E. Norman、Helen M.I. Osborn
DOI:10.1016/j.tet.2008.01.042
日期:2008.3
In this work, the synthetic utility of the Ferrier reaction to access S-linked disaccharides and S-linked glycoamino acids has been probed. Significantly, entry to a range of 1,4- and 1,6-S-linked disaccharides has been achieved using glycals derived from glucose and galactose, and sulfur containing coupling partners derived from methyl alpha-D-glucopyranoside. Access to S-linked glycoamino acids and glycopeptides has also been achieved using protected cysteine and homocysteine coupling partners within the Ferrier reaction. Functionalisation of the Ferrier products, for example, via dihydroxylation using OsO4 or amino acid coupling, and deprotection of the targets have also been achieved. In this way, entry to materials of interest as mimics of biologically interesting disaccharides and glycopeptides has been realised, including targets derived from rare sugars such as talopyranose and gulopyranose. (C) 2008 Elsevier Ltd. All rights reserved.