One-pot synthesis of oxazolidinones and five-membered cyclic carbonates from epoxides and chlorosulfonyl isocyanate: theoretical evidence for an asynchronous concerted pathway

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Demir E., Sari O., Çetinkaya Y., Atmaca U., Erdem S. S., Çelik M.

BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY, cilt.16, ss.1805-1819, 2020 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 16
  • Basım Tarihi: 2020
  • Doi Numarası: 10.3762/bjoc.16.148
  • Dergi Adı: BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aquatic Science & Fisheries Abstracts (ASFA), Biotechnology Research Abstracts, Chemical Abstracts Core, Directory of Open Access Journals
  • Sayfa Sayıları: ss.1805-1819
  • Anahtar Kelimeler: chlorosulfonyl isocyanate, computational modeling, cyclic carbonates, density functional theory, oxazolidinone, CATALYZED OXIDATIVE CARBONYLATION, RING-OPENING POLYMERIZATION, DENSITY FUNCTIONALS, 2-OXAZOLIDINONES, CO2, DERIVATIVES, EFFICIENT, STEPWISE, ALCOHOLS, DIOXIDE
  • Atatürk Üniversitesi Adresli: Evet

Özet

The one-pot reaction of chlorosulfonyl isocyanate (CSI) with epoxides having phenyl, benzyl and fused cyclic alkyl groups in different solvents under mild reaction conditions without additives and catalysts was studied. Oxazolidinones and five-membered cyclic carbonates were obtained in ratios close to 1:1 in the cyclization reactions. The best yields of these compounds were obtained in dichloromethane (DCM). Together with 16 known compounds, two novel oxazolidinone derivatives and two novel cyclic carbonates were synthesized with an efficient and straightforward method. Compared to the existing methods, the synthetic approach presented here provides the following distinct advantageous: being a one- pot reaction with metal-free reagent, having shorter reaction times, good yields and a very simple purification method. Moreover, using the density functional theory (DFT) method at the M06-2X/6-31+G(d,p) level of theory the mechanism of the cycloaddition reactions has been elucidated. The further investigation of the potential energy surfaces associated with two possible channels leading to oxazolidinones and five-membered cyclic carbonates disclosed that the cycloaddition reaction proceeds via an asynchronous concerted mechanism in gas phase and in DCM.