α-Methylphenacyl (Mpa) thioesters are described as precursors of thioacids. Mpa thioesters are accessible via the condensation of carboxylic acids and phenacyl thiol, which is easily prepared without column chromatography. The Mpa thioesters are selectively deprotected by reduction with zinc dust in the presence of conventional thioacid protecting groups. In addition, the Mpa group exhibits orthogonal
Synthesis of β-oxo carbonyl and thiocarbonyl compounds via basic sulfur abstraction
作者:Saúl Silva、Christopher D. Maycock
DOI:10.1016/j.tet.2019.130552
日期:2019.10
suitable thioesters represents a mild method for the formation of carbon-carbon bonds and the formation of 1,3-dicarbonyl compounds. A study of the scope and limitations of this reaction for the synthesis of these or mixed 1,3-carbonyl/thiocarbonyl compounds by a base promoted sulfur abstraction rearrangement is described. These reactions were typically very clean and the products were obtained in good
An efficient synthetic method for the preparation of multisubstituted furans, thiophenes, and pyrroles using ynolates was developed. This novel formal [4 + 1] annulation by C2-C3 and C3-C4 bond formations includes cycloaddition, cyclization, decarboxylation, and dehydration as key steps.
Exploration and Optimization of an Efficient One-pot Sequential Synthesis of Di/tri-substituted Thiazoles from α-Bromoketones, Thioacids Salt, and Ammonium Acetate
作者:Eeda Venkateswararao、Hitesh B. Jalani、Manickam Manoj、Sang-Hun Jung
DOI:10.1002/jhet.2446
日期:2016.9
Exploration of scope of an optimized one‐pot sequential procedure for preparing of 2,4‐di‐ and 2,4,5‐tri‐substituted thiazoles has been accomplished. The synthesis was performed by the initial formation of a β‐keto‐thioester intermediate from nucleophilic substitution of α‐bromoketones with thioacid potassium salts, followed by treatment with ammoniumacetate and one equivalent of acetic acid in toluene
A Novel Method for the Synthesis
of Thioacetates Using Benzyltriethylammonium Tetrathiomolybdate
and Acetic Anhydride
作者:Srinivasan Chandrasekaran、Nasir Baig. R.B.、Sai Sudhir. V.
DOI:10.1055/s-0028-1083517
日期:——
Herein we report a simple and efficient methodology for the synthesis of thioacetates using benzyltriethylammonium tetrathiomolybdate and acetic anhydride as the key reagents, starting from alkyl halides in a multistep, tandem reaction process. Its application in the synthesis of orthogonally protected cysteine and anomeric β-thioglycosides has also been demonstrated.