Eco-efficient, regioselective and rapid access to 4,5-disubstituted 1,2,3-thiadiazoles via [3 + 2] cycloaddition of α-enolicdithioesters with tosyl azide under solvent-free conditions
An efficient, eco-friendly, and highly convergent one-pot route to privileged thiazoloquinolinone derivatives has been developed via four-component cascade coupling (4CCC) of α-enolic dithioesters, cysteamine/2-aminothiophenols, aldehydes, and cyclic 1,3-diketones in recyclable [EMIM][EtSO4] ionicliquid at room temperature for the first time. The reaction proceeds via a N,S-acetal formation, Knoevenagel
Catalyst-free one-pot sustainable synthesis of thiazoloquinoline and thiazolopyridine scaffolds is achievedviafour-component domino reactions in water–PEG.
achieved at roomtemperature under aerobic neutral conditions to afford unsymmetrical α-oxoketene S,S-acetals for the first time. This operationally simple, mild protocol tolerates a wide range of arylboronic acids and α-enolic dithioesters. Typical features of this novel strategy include short reaction times (5 min), good yields and highly selective C=S functionalization leading to S-arylation in one pot
Magnesium catalyzed [3 + 3] heteroannulation of α-enolic dithioesters with MBH acetate: access to functionalized 3,4-dihydro-2<i>H</i>-thiopyrans
作者:Sonam Soni、Gaurav Shukla、Maya Shankar Singh
DOI:10.1039/d2ob01258h
日期:——
An efficient heteroannulation employing racemic Morita–Baylis–Hillman acetate and α-enolic dithioesters enabling the formation of dihydro-2H-thiopyrans is reported.
The synthesis of 4-(trifluoromethyl)-2,3-dihydrothiazoles from α-enolic dithioesters and imidoyl sulfoxonium ylides has been achieved under thermal conditions. This transformation is catalyst-free, additive-free, and operationally simple, and it proceeds via a formal insertion of alkenyl S−H generated in situ from dithioesters into ylides followed by an intramolecular annulation. This approach further