反应详情

温度

20 °C

To a stirred solution of 5.3 mL (7.71 g, 60.7 mmoles) oxalyl chloride in 100 mL methylene choride at -70° C. under argon was added 8.6 mL (10.23 g, 121.5 mmoles) dimethyl sulfoxide in 30 mL methylene chloride. After 2 min. a solution of 12 g (55.2 mmoles) of (6) in 50 mL methylene chloride was added over 5 min. After 20 min. 38.5 mL (27.9 g, 276 mmoles) triethylamine was added. After 10 min. more, the mixture was allowed to warm to 20° C. and 250 mL water was added. After separation, the aqueous layer was extracted again with methylene chloride and the combined organic layers were washed with brine and dried over sodium sulfate. After evaporation in vacuo, the residue was chromatographed (Flash, hexane-ethyl acetate, 7:3) to provide 11.36 g of a pale yellow oil (7).

1. waitAfter 10 min. more
2. customAfter separation
3. extractionthe aqueous layer was extracted again with methylene chloride
4. washthe combined organic layers were washed with brine
5. dry with materialdried over sodium sulfate
6. customAfter evaporation in vacuo
7. customthe residue was chromatographed (Flash, hexane-ethyl acetate, 7:3)