S-functionalized internal olefins, that is, α-oxo ketene dithioacetals, was efficiently achieved with alcohols as the alkoxylating agents, (diacetoxyiodo)benzene (PhI(OAc)2) as the oxidant, and benzoquinone (BQ) as the co-oxidant. The alkoxylated olefins were thus constructed and applied for the synthesis of alkoxylated N-heterocycles. Polarization of the olefinic carbon-carbon doublebond by the electron-donating
CuCl2 and CuBr2-mediated intramolecular oxidative C–H/N–H cross-coupling/halogenation of β-thioalkyl-α-alkenoyl ketene N,S-acetals provides a new concise synthetic route to pyrrolones.
Synthesis of chiral α-carbonyl-δ-nitro-ketenedithioacetals via l-proline-catalyzed Michael addition reaction
作者:Mathiyazhagan Arun Divakar、Sivakumar Shanmugam
DOI:10.1007/s11164-017-3025-1
日期:2017.12
Abstract Regioselective synthesis of 1,1-bis(methylthio)-6-nitro-5-arylhex-1-en-3-one has been achieved from α-alkenoylketene dithioacetals with nitromethane using l-proline catalyst viaMichaeladdition. The synthesized compounds 3a–j were well characterised by NMR and mass spectral techniques. One of the structures was confirmed by single crystal XRD. The enantioselectivity and its specific rotation
α-Aroylidineketene dithioacetal chemistry: CuI catalyzed synthesis of 2-styryl benzimidazoles enroute to regioselective hydrothiolation
作者:Pandi Dhanalakshmi、Sivakumar Shanmugam
DOI:10.1016/j.tet.2015.06.008
日期:2015.9
Reactivity of alpha-aroylidineketene dithioacetals 2 was investigated to synthesize novel 2-styrylbenzimidazole derivatives 4 and their hydrothiolated product 2-(2-(methylthio)-2-arylethyl)-1H-benzoidlimidazoles 5 has been reported. Compounds 4 and 5 were synthesized by cyclocondensation of alpha-aroylidineketene dithioacetals 2 and o-phenylene diamine (OPD) 3 in the presence and absence of copper catalyst respectively. Regioselective one-pot tandem hydrothiolation of olefin functionality in 4 was achieved under AcOH conditions. (C) 2015 Elsevier Ltd. All rights reserved.
Chemotherapy of leishmaniasis. Part IX: Synthesis and bioevaluation of aryl substituted ketene dithioacetals as antileishmanial agents
A new series of aryl substituted ketene dithioacetals 6a–h was synthesized and evaluated for their in vitro and in vivo antileishmanial activity against Leishmania donovani. Two compounds exhibited significant in vitro activity against intracellular amastigotes of L. donovani with IC50 values 3.56 and 5.12 μM and were found promising as compared with reference drug, miltefosine. On the basis of good