Sonogashira Coupling of Functionalized Trifloyl Oxazoles and Thiazoles with Terminal Alkynes: Synthesis of Disubstituted Heterocycles
作者:Neil F. Langille、Les A. Dakin、James S. Panek
DOI:10.1021/ol026099r
日期:2002.7.1
see text] This paper describes Sonogashira cross-coupling of functionalized 2-, 4-, and 5-trifloyl oxazoles and thiazoles with terminal alkynes. This methodology has been extended to 2,4-ditrifloylthiazoles, which results in regioselective cross-coupling at the C2-position of the thiazole. The resulting 2-alkynyl-4-trifloylthiazoles are effective electrophiles in a second palladium(0)-mediated cross-coupling
Reactions of amino-acids, and of their N-acyl and N-thioacyl derivatives, with thioaceticacid, offer simple new routes to nitrogen–sulphur heterocyclic compounds.
Synthese von 6-Thia-minocyclin, einem Thiaanalogon des Antibiotikums Minocyclin
作者:Richard Kirchlechner、Jürgen Seubert
DOI:10.1002/ardp.19823150608
日期:——
6‐Thia‐minocyclin, das 6‐Thiaanalogon des Antibiotikums Minocyclin wurde in 14‐stufiger Synthese, ausgehend von 2‐Nitro‐5‐methoxy‐phenol, dargestellt; seine antibakterielle Wirksamkeit ist mit der des Minocyclins vergleichbar.
Improved Erlenmeyer Synthesis with 5-Thiazolone and Catalytic Mn(II) Acetate. Crystal Structure Confirmation of the Reaction Stereochemistry
作者:Sosale Chandrasekhar、V. Mohana Rao
DOI:10.1002/jhet.1921
日期:2014.8
the presence of the mild base Mn(II) acetate as catalyst in CH2Cl2 solution. This leads to the corresponding Erlenmeyer reaction products () in excellent yields in the case of aromatic aldehydes and moderate yields in others. The mildness of the reaction conditions is apparently enabled by the aromaticity of the (putative) intermediate thiazolone anion. The structure and stereochemistry (Z) of the product