反应详情

To a solution of tert-butyl N-[(1R)-1-[[6-(7-methylspiro[2H-benzofuran-3,1′-cyclopropane]-4-yl)oxy-3-pyridyl]carbamoyl]propyl]carbamate (Intermediate 16, 55 mg) in dry DCM (3 ml) at 0° C. TFA (1 ml) was slowly added and the reaction mixture was stirred for 3 hours at the same temperature. The solvent and the excess of TFA were removed under reduced pressure and the residue was diluted with DCM (10 ml) and an aqueous saturated solution NaHCO3 was added while the pH was allowed to reach ˜8. Two phases were separated and the organic layer was dried (Na2SO4), filtered and evaporated affording the title compound (41 mg) as white solid.

1. customat 0° C
2. customThe solvent and the excess of TFA were removed under reduced pressure
3. additionthe residue was diluted with DCM (10 ml)
4. additionan aqueous saturated solution NaHCO3 was added while the pH
5. customTwo phases were separated
6. dry with materialthe organic layer was dried (Na2SO4)
7. filtrationfiltered
8. customevaporated