反应详情

Freshly distilled triethylamine (1.28 g, 8.2 mmol) was dissolved in 75 mL of freshly distilled methylene chloride. To this solution was added 2.3 g (3.9 mmol) of 2-O-((1,1-dimethylethyl)diphenylsilyl)-3-(((1,1- dimethylethyl)diphenyl-silyl)oxymethyl)-1,2-cyclobutanediol from Step K and the resultant solution was cooled to -78° C. with stirring, under a nitrogen atmosphere. Methanesulfonyl chloride (0.99 g, 8.2 mmol) was added and the reaction mixture was allowed to warm to ambient temperature. After 3.5 h, the reaction mixture was diluted with 125 mL of methylene chloride and this solution was washed with 100 mL of water, dried over anhydrous magnesium sulfate, filtered and concentrated in vacuo. The residue (2.9 g) was dissolved in 25 mL of 10% acetone in hexane and purified on a 2.5×45 cm silica gel column eluted at 2 psi with 500 mL of 5% acetone in hexane, followed by 250 mL of 10% acetone in hexane, to give 1.57 g (60% yield) of the title compound; MS DCI-NH3M/Z: 690 (M+NH4)+ ; 1H NMR (CDCl3) δ 1.95, m, 1H), 2.20 (m, 1H), 2.77 (m, 1H), 2.90 (s, 3H), 3.39 (d, 2H), 4.39 (m, 1H), 4.88 (m, 1H), 7.30-7.54 (m, 15H), 7.60-7.70 (m, 5H).

1. washthis solution was washed with 100 mL of water
2. dry with materialdried over anhydrous magnesium sulfate
3. filtrationfiltered
4. concentrationconcentrated in vacuo
5. dissolutionThe residue (2.9 g) was dissolved in 25 mL of 10% acetone in hexane
6. custompurified on a 2.5×45 cm silica gel column
7. washeluted at 2 psi with 500 mL of 5% acetone in hexane