Реакция #8580

Уравнение реакции

potassium tertiary-butoxide

compound

(3S)-(+)-7,8-Difluoro-3,4-dihydro-3-methyl-2H-[1,4]benzoxazine

diethyl ethoxymethylenemalonate

→

title compound

Выход 88.0%

Diethyl [(3S)-7,8-difluoro-3-methyl-2,3-dihydro-4H-[1,4]benzoxazin-4-yl]methylenemalonate

Выход 88.0%

Растворители

DMF

DMF

Условия реакции

Обработка

1. 1
   Температураcooling
2. 2
   workup.ADDITIONAfter treating in a conventional manner

Методика

To DMF (2.5 ml) was added potassium tertiary-butoxide (75 mg) under ice-cooling. After dropping a solution of the compound (100 mg) obtained in Example 78 and diethyl ethoxymethylenemalonate (233 mg) in DMF (0.5 ml), the resultant mixture was stirred for 2 hours. After treating in a conventional manner, the obtained residue was subjected to silica gel column chromatography to thereby give 153 mg (88%) of the title compound as an oily product. The physical constants of the obtained compounds was identical with those described in Japanese Patent No. 2,769,174.

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