One-pot synthesis of oxazolidinones and five-membered cyclic carbonates from epoxides and chlorosulfonyl isocyanate: theoretical evidence for an asynchronous concerted pathway
作者:Esra Demir、Ozlem Sari、Yasin Çetinkaya、Ufuk Atmaca、Safiye Sağ Erdem、Murat Çelik
DOI:10.3762/bjoc.16.148
日期:——
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
Organotellurium-mediated synthesis of oxazolidin-2-ones from alkenes
作者:Nan X. Hu、Yoshio Aso、Tetsuo Otsubo、Fumio Ogura
DOI:10.1039/c39870001447
日期:——
Phenyltellurinyl trifluoracetate in combination with ethyl carbamate and boron trifluoride–diethyl ether reacted with alkenes in refluxed 1,2-dichloroethane, regio- and stereo-selectively giving oxazolidin-2-ones in high yields.
efficient method for forming C−N bonds via intramolecular amidation catalyzed by well-defined Cp*Co(N,O)I complexes. The reaction has been operate under mild conditions and produced a regioselective amidation product without the use of a bulky counter anion or expensive fluorinated solvents. The Cp*Co(N,O)-I catalyst is very effective for intramolecular benzylic, tertiary, and internal C(sp3)−H bond