. Dans-un-ballon-sont-ajoutés-la, 4-phényloxazolidin-2-one 56 (166 mg, 1.0 mmol, 1.0 éq), l'éther couronne 18-C-6 (265 mg, 1.0 mmol, 1.0 éq.) et le tert-butylate de potassium (118 mg, 1.0 mmol, 1.0 éq.). Le ballon est placé à 0°C avant que du THF soit additionné (8 mL)

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