反应详情

A solution of (R)-N-(2-pyridyl)-2-aminopropanol (20.0 g, 0.13 moles) and N,N-diisopropylethylamine (33.6 g, 0.13 moles) in dichloromethane (500 ml) was cooled to 5° C. Then thionyl chloride (15.5 g, 0.13 moles) in dichloromethane (100 ml) was added slowly whilst the temperature was kept below 10° C. The mixture was stirred for 0.5 h. and ice cold water (500 ml) was added. The organic phase was separated and washed with water (5×500 ml). The aqueous phase was back-extracted with dichloromethane (2×500 ml), the organic phases were combined, dried (MgSO4) and evaporated in vacuo to give a brown oil. This was purified on a silica column, eluting with diethyl ether to give (R)4-methyl-3-(2-pyridyl)-[1,2,3]oxathiazolidine 2-oxide (15.4 g) as a clear oil.

1. customwas kept below 10° C
2. customThe organic phase was separated
3. washwashed with water (5×500 ml)
4. extractionThe aqueous phase was back-extracted with dichloromethane (2×500 ml)
5. dry with materialdried (MgSO4)
6. customevaporated in vacuo
7. customto give a brown oil
8. customThis was purified on a silica column
9. washeluting with diethyl ether