反应详情

温度

-78 °C

A −78° C. solution of oxalyl chloride (1.73 g, 13.6 mmol) in dichloromethane (20 mL) was treated with DMSO (20 mL). After 5 min., a solution of alcohol 16 (2.57 g, 11.3 mmol) in dichloromethane (20 mL) was added. After another 15 min., triethylamine (7.1 mL, 50.6 mmol) was added. The reaction was stirred at −78° C. for 5 min., and then allowed to warm to room temperature. After 30 min., 100 mL water was added and the mixture extracted with dichloromethane (3×60 mL). The combined dichloromethane solution was dried (Na2SO4), filtered and evaporated. Purification by flash chromatography on silica gel (10% ethyl acetate/hexane) gave 2.11 g (9.4 mmol, 83%) of the aldehyde (17).

1. waitAfter another 15 min.
2. temperatureto warm to room temperature
3. waitAfter 30 min.
4. extractionthe mixture extracted with dichloromethane (3×60 mL)
5. dry with materialThe combined dichloromethane solution was dried (Na2SO4)
6. filtrationfiltered
7. customevaporated
8. customPurification by flash chromatography on silica gel (10% ethyl acetate/hexane)