Synthesis 2013; 45(17): 2405-2412
DOI: 10.1055/s-0033-1338499
paper
© Georg Thieme Verlag Stuttgart · New York

Expedient Base-Mediated Desulfitative Dimethylamination, Oxidation, or Etherification of 2-(Methylsulfanyl)-3,5-dihydro-4H-imidazol-4-one Scaffolds

Authors

  • Shahnawaz Khan

    a   Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, 226 001, India   eMail: premsc58@hotmail.com   eMail: prem_chauhan_2000@yahoo.com   Fax: +91(522)2623405
  • Vikas Tyagi

    a   Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, 226 001, India   eMail: premsc58@hotmail.com   eMail: prem_chauhan_2000@yahoo.com   Fax: +91(522)2623405
  • Rohit Mahar

    b   Sophisticated Analytical Instrument Facility, CSIR-Central Drug Research Institute, Lucknow, 226 001, India
  • Vikas Bajpai

    b   Sophisticated Analytical Instrument Facility, CSIR-Central Drug Research Institute, Lucknow, 226 001, India
  • Brijesh Kumar

    b   Sophisticated Analytical Instrument Facility, CSIR-Central Drug Research Institute, Lucknow, 226 001, India
  • Prem M. S. Chauhan*

    a   Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, 226 001, India   eMail: premsc58@hotmail.com   eMail: prem_chauhan_2000@yahoo.com   Fax: +91(522)2623405
Weitere Informationen

Publikationsverlauf

Received: 30. Januar 2013

Accepted after revision: 03. Juni 2013

Publikationsdatum:
11. Juli 2013 (online)


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Abstract

The dimethylamino functionality is generally introduced onto the 3,5-dihydro-4H-imidazol-4-one skeleton by treatment of a halogenated derivative with low-boiling dimethylamine at a high temperature and pressure. The corresponding aliphatic ethers are usually prepared by Williamson ether synthesis, but the available transition-metal-catalyzed methods require highly toxic reagents (such as dimethyl sulfate or methyl halides) and expensive metal catalysts, and they entail harsh reaction conditions and complex workups. A simple and efficient method is described for base-mediated­ desulfitative dimethylamination, oxidation, or etherification at the C2-position of the 2-(methylsulfanyl)-3,5-dihydro-4H-imidazol-4-one scaffold by using potassium carbonate and aqueous N,N-dimethylformamide or an aliphatic alcohol.

Supporting Information