反应详情

To a stirred suspension of 2.59 g (4.48 mmole) product from Example 127 in 100 mL tetrahydrofuran was added dropwise 9 mL (9.40 mmole) UB(sec-butyl)3H (1M in THF, L-Selectride®) at -78° C. The mixture was stirred for 2 hours, then quenched with 5% ammonium chloride. The mixture was poured into water, acidified to ph 1-4 with 1N HCl, and extracted with ethyl acetate. The ethyl acetate extract was washed with water and brine and dried (MgSO4) and concentrated to give an oil. Flash chromatography on silica gel eluting with 2.5% methanol in dichloromethane afforded 1.4 g (54%) of the title product as a solid, mp 183°-185° C. Analysis calculated for C26H20N2S2O5F4 : C, 53.79; H, 3.47; N, 4.83. Found: C, 53.25; H, 3.23; N, 4.45.

1. additionwas added dropwise 9 mL (9.40 mmole) UB(sec-butyl)3H (1M in THF, L-Selectride®) at -78° C
2. customquenched with 5% ammonium chloride
3. additionThe mixture was poured into water
4. extractionextracted with ethyl acetate
5. extractionThe ethyl acetate extract
6. washwas washed with water and brine
7. dry with materialdried (MgSO4)
8. concentrationconcentrated
9. customto give an oil