反应详情

Potassium tert-butoxide (30.4 mL, 1 M in tetrahydrofuran, 30.4 mmol) was added drop wise to a stirred and cooled (0° C.) solution of tosylmethyl isocyanide (4.74 g, 24.27 mmol) in dry DME (40 mL). After ten minutes, dry methanol (0.98 mL, 24.28 mmol) was added and followed by a solution of the product of Example 5B (3.11 g, 12.14 mmol) in DME (10 mL). The resulting solution was allowed to warm to room temperature and then heated (45° C.) for thirty minutes. After cooling, the reaction mixture was partitioned with diethyl ether and water. The organic phase was washed with brine, dried (MgSO4), filtered, and evaporated. The residue was purified over silica gel using 2-10% diethyl ether in hexanes to give the title compound as an oil.

1. waitAfter ten minutes
2. temperatureheated (45° C.) for thirty minutes
3. temperatureAfter cooling
4. customthe reaction mixture was partitioned with diethyl ether and water
5. washThe organic phase was washed with brine
6. dry with materialdried (MgSO4)
7. filtrationfiltered
8. customevaporated
9. customThe residue was purified over silica gel using 2-10% diethyl ether in hexanes