反应详情

To a solution of compound 29 (0.100 g, 0.26 mmol) in DCM (8.00 mL) was added 4-dimethylaminopiperidine (0.044 g, 0.34 mmol) and TEA (0.034 g, 0.34 mmol). The reaction was monitored with TLC (25% EtOAc in hexanes, Rf=0.0). After stirring at room temperature for 2 hrs, the reaction was complete as indicated by the absence of the starting material (TLC). Water was added and aqueous layer was extracted twice with DCM. Combined extracts were washed sequentially with water and brine, dried over MgSO4, filtered, and evaporated in vacuo to form a clear oil. The oil was dissolved in DCM and purified with chromatography with a gradient from 0 to 30% MeOH in DCM. Pure fractions were combined, evaporated in vacuo, triturated with DCM and hexanes, and then filtered to yield compound 83 as a white powder (0.068 g, 100% HPLC purity, 56% yield). 1H NMR (500 MHz, DMSO-d6): δ 8.26 (d, J=2 Hz, 1H), 7.89 (m, 2H), 7.78 (d, J=9 Hz, 1H), 7.71 (dd, J1=3 Hz, J2=9 Hz, 1H), 6.93 (d, J=8 Hz, 1H), 3.79 (d, J=12 Hz, 2H), 2.85 (t, J=13 Hz, 2H), 2.22 (m, 1H), 2.12 (s, 6H), 1.79 (m, 2H), 1.40 (m, 2H); MS (ESI, EI+): m/z=470 (MH+); melting point: 140-143° C.

1. extractionaqueous layer was extracted twice with DCM
2. washCombined extracts were washed sequentially with water and brine
3. dry with materialdried over MgSO4
4. filtrationfiltered
5. customevaporated in vacuo
6. customto form a clear oil
7. custompurified with chromatography with a gradient from 0 to 30% MeOH in DCM
8. customevaporated in vacuo
9. customtriturated with DCM and hexanes
10. filtrationfiltered