反应详情

Methanesulfonyl chloride (0.55 mL, 7.1 mmol) was added to a 0° C. solution of N-(2-{2-[2-(2-hydroxyethoxy)ethoxy]ethoxy}ethyl)-3-(tritylthio)propanamide (3.38 g, 6.45 mmol) and triethylamine (1.08 mL, 7.74 mmol) in dichloromethane (33 mL). The solution was allowed to warm to room temperature. After 4 hours, the solution was diluted with dichloromethane and washed with water (2×) and brine. The organic phase was dried over sodium sulfate, filtered, and concentrated under reduced pressure to yield 4.71 g of 13-oxo-17,17,17-triphenyl-3,6,9-trioxa-16-thia-12-azaheptadec-1-yl methanesulfonate, which was concentrated from toluene and used in Part C.

1. washwashed with water (2×) and brine
2. dry with materialThe organic phase was dried over sodium sulfate
3. filtrationfiltered
4. concentrationconcentrated under reduced pressure