Ethyl 2-(<i>tert</i>-Butoxycarbonyloxyimino)-2-cyanoacetate (Boc-Oxyma) as Coupling Reagent for Racemization-Free Esterification, Thioesterification, Amidation and Peptide Synthesis
the synthesis and utility of ethyl2-(tert-butoxycarbonyloxyimino)-2-cyanoacetate (Boc-Oxyma) as an efficient coupling reagent for racemization-free esterification, thioesterification, amidation reactions and peptide synthesis that uses equimolar amounts of acids and alcohols, thiols, amines or amino acids, respectively. Its application to solid phase as well as solution phase peptide synthesis is also
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.
"Mediator methodology" for the synthesis of peptides in a two-polymeric system
作者:Yechiel Shai、Kenneth A. Jacobson、Abraham Patchornik
DOI:10.1021/ja00300a029
日期:1985.7
Cette methode est basee sur le transfert d'un aminoacide N-protege d'un polymere insoluble (donneur) sur un aminoacide lie a un autre polymere insoluble (accepteur) a l'aide d'une molecule mediateur soluble
Cette methode est basee sur le transfert d'unaminoacide N-protege d'unpolymere 不溶性 (donneur) sur un aminoacide lie a un autrepolymere 不溶性 (accepteur) a l'aide d'une 分子介质可溶
Chemo- and regioselective preparation of zinc enolate from thiol esters by palladium catalyzed cross-coupling reaction
The palladium catalyzed cross-coupling reaction of thiolesters with bis(iodozincio)methane or 1,1-bis(iodozincio)ethane gave Reformatsky-type enolates. They can react with some electrophiles to give the corresponding adducts and were also trapped by silylation reagents to afford silyl enol ethers. As the method applicable to the thiolester carrying ketone moiety, it afforded zinc enolates carrying
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