Ethyl 2-methoxyacetate → Ethyl 4-cyano-7-fluoro-5-methyl-6-phenyl-1,3-benzoxazole-2-carboxylate

Beteiligte Stoffe

Reaktionsschritte

4-Amino-6-fluoro-5-hydroxy-2-methylbiphenyl-3-carbonitrile (I-41) (5.0 g, 20.64 mmol) and ethyl methoxyacetate (18.18 g, 82.56 mmol) were stirred at 100° C. for 23 hours under nitrogen atmosphere. The reaction liquid was cooled to room temperature, and left at the same temperature for 17 hours. At 0° C., hexane was added to the suspension, and left at the same temperature for 1 hour. With washing with hexane, the precipitated crystal was collected by filtration. The crystal was collected, dried at 50° C. under reduced pressure for 4 hours, and then at room temperature for 12 hours to obtain the entitled compound (6.39 g, 96%) as a pale brown powder.

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