反应详情

To 1.99 g of dimethyl sulfoxide in 45 mL methylene chloride at −78° C. was added 2.16 g of oxalyl chloride. After 10 min, 1.865 g of 4-hydroxymethyl-N-benzoylpiperidine (Step B) in 15 mL of methylene chloride was added at −78° C. and stirred for 30 min. DIEA (5.49 mL) was added and this mixture was stirred for an additional 30 min. at −78° C. and then warmed to room temperature and stirred another 30 min. The reaction was quenched with 50 mL water and extracted with 3×50 mL methylene chloride. The combined organic layers were dried over magnesium sulfate and evaporated under reduced pressure. The residue was chromatographed with 2:1 hexane:ethyl acetate followed by 1:1 hexane : ethyl acetate to give 1.445 g of the title compound.

1. stirringthis mixture was stirred for an additional 30 min. at −78° C.
2. stirringstirred another 30 min
3. customThe reaction was quenched with 50 mL water
4. extractionextracted with 3×50 mL methylene chloride
5. dry with materialThe combined organic layers were dried over magnesium sulfate
6. customevaporated under reduced pressure
7. customThe residue was chromatographed with 2:1 hexane