An Efficient Synthesis of Nα-Protected Amino and Peptide Acid Aryl Amides via Iodine-Mediated Oxidative Acylation of Nα-Protected Amino and Peptide Thioacids
Abstract Thioacids derived from N-protected amino or dipeptide and tripeptide acids undergo facile N-acylation with aromatic amines to afford N-protected amino or peptide aryl amides in good to excellent yields and enantiopurities. The method also furnishes difficult-to-prepare N-Fmoc amino acid 4-nitroanilides in good yields. This simple oxidative Nα-acylation of thioacids with aromatic amines proceeds
A simple method for the conversion of carboxylic acids into thioacids with Lawesson’s reagent
作者:Yu Rao、Xuechen Li、Pavel Nagorny、Joji Hayashida、Samuel J. Danishefsky
DOI:10.1016/j.tetlet.2009.09.080
日期:2009.12
A one-step protocol for the conversion of carboxylic acids to thioesters, using Lawesson’sReagent, has been developed.
已经开发出一种使用劳森试剂将羧酸转化为硫酯的一步方案。
Copper(ii) mediated facile and ultra fast peptide synthesis in methanol
作者:Sachitanand M. Mali、Sandip V. Jadhav、Hosahudya N. Gopi
DOI:10.1039/c2cc32581k
日期:——
A novel, ultrafast, mild and scalable amide bond formation strategy in methanol using simple thioacids and amines is described. The mechanism suggests that the coupling reactions are initially mediated by CuSO4·5H2O and subsequently catalyzed by in situ generated copper sulfide. The pure peptides were isolated in satisfactory yields in less than 5 minutes.
FACILE AMIDE FORMATION VIA S-NITROSO THIOACID INTERMEDIATES
申请人:Xian Ming
公开号:US20120190820A1
公开(公告)日:2012-07-26
Provided are methods for forming a reactive S-nitroso thioacid (NTA), comprising nitrosation of a thioacid with a nitrosation reagent. Also provided are methods for: acylating a nucleophile including selective acylation with a high degree of selectivity toward amines over hydroxyls; amide or peptide bond formation; forming a dipeptide or polypeptide; and peptide coupling/ligation, comprising use of thioacid and amine starting materials, wherein the reactions are mediated by very reactive S-nitroso thioacid (NTA) intermediates enabling extremely fast reactions under mild conditions, providing for broad applications.
A novel ynamide-mediated synthesis of thionoesters and dithioesters is described. The selective addition reactions of various monothiocarboxylic acids with ynamide furnish alpha-thioacyloxyenamides, which undergo transesterification with nucleophilic -OH or -SH species to afford thionoesters and dithioesters, respectively. The broad substrate scope, mild reaction conditions, and excellent yields make this method an attractive synthetic approach to thionoesters and dithioesters.