反应详情

5-Ethoxycarbonylamino-2-((3R)-3-t-butoxycarbonylamino-1-pyrrolidinyl)fluorobenzene (33.6 g, 0.092 M) was dissolved in dry tetrahydrofuran (300 ml) under nitrogen. cooled to −70°, and treated dropwise over 30 minutes with a solution of lithiun t-butoxide (1 M in tetrahydrofuran, 100.7 ml), keeping the temperature below −65°. After stirring for 5 minutes, (R)-glycidylbutyrate (14.52 g, 0.101 M) was added, and stirring continued at −65° for 1 hour, before allowing the temperature to rise to ambient over 16 hours. The mixture was treated with MeOH (50 ml), stirred at ambient temperature for 1 hour, and the precipitate collected and washed well with tetrahydrofuran to give the desired product (21.8 g).

1. temperaturecooled to −70°
2. customthe temperature below −65°
3. stirringstirring
4. waitcontinued at −65° for 1 hour
5. waitto ambient over 16 hours
6. stirringstirred at ambient temperature for 1 hour
7. customthe precipitate collected
8. washwashed well with tetrahydrofuran