反应详情

1.1 g (2.3 mmole) of 6-O-DMT-1,5-anhydro-2-azido-2,3-dideoxy-D-glucitol (12) were dissolved in 11 ml of pyridine and 9 ml of 32% aqueous ammonia, then 1.0 g (3.9 mmole) of triphenylphosphane are added. The reaction mixture was stirred for 18 h at r.t. Thereafter the reaction mixture was evaporated. The residue was dissolved in 180 ml of ethyl acetate und washed twice with 100 ml of 5% sodium hydrogencarbonate solution. Organic layer was separated, dried over sodium sulfate, filtered and evaporated to dryness. The residue was dissolved in 5 ml of ethyl acetate and purified by flash-chromatography over silica gel (ethyl acetate/methanol/1% triethylamine gradient). Product fractions were combined, evaporated and dried at high vacuum to yield 0.94 g (91%) of a colorless foam.

1. customThereafter the reaction mixture was evaporated
2. dissolutionThe residue was dissolved in 180 ml of ethyl acetate
3. washund washed twice with 100 ml of 5% sodium hydrogencarbonate solution
4. customOrganic layer was separated
5. dry with materialdried over sodium sulfate
6. filtrationfiltered
7. customevaporated to dryness
8. dissolutionThe residue was dissolved in 5 ml of ethyl acetate
9. custompurified by flash-chromatography over silica gel (ethyl acetate/methanol/1% triethylamine gradient)
10. customevaporated
11. customdried at high vacuum