反应详情

Methyl 4-fluoro-3-nitrobenzoate (13.6 g) was added over 10 minutes to a stirred solution of sodium thiomethoxide (4.8 g) in 1,3-dimethyl-2-imidazolidinone (100 ml). The dark brown solution was stirred for 2 hours and was then heated on a steam bath for 2.5 hours. After cooling, the solution was poured into water (1.0 liter) and was extracted with diethyl ether (300 ml and then 2×200 ml). The ether solution was washed with water (2×250 ml), was dried over magnesium sulphate and was then concentrated in vacuo to leave an orange slurry. Crystallization from methanol provided methyl 4-methylthio-3-nitrobenzoate (3.45 g), m.p. 118°-120° C. [Elemental analysis: C,47.8; H,3.9; N,6.2; S,13.7%; calculated: C,47.58; H,3.96; N,6.17; S,14.1%].

1. temperaturewas then heated on a steam bath for 2.5 hours
2. temperatureAfter cooling
3. extractionwas extracted with diethyl ether (300 ml
4. washThe ether solution was washed with water (2×250 ml)
5. dry with materialwas dried over magnesium sulphate
6. concentrationwas then concentrated in vacuo
7. customto leave an orange slurry
8. customCrystallization from methanol