反应详情

A solution of Example 354 (0.030 g, 0.067 mmol) in dimethylformamide (3 mL) was treated with 2-chloro-1,1,1-trimeth oxyethane (0.50 mL) and a catalytic amount of para-toluenesulfonic acid at 60° C. for 4 hours. The solvent was removed under a stream of warm nitrogen and the resulting residue was triturated with water and filtered, then triturated with methanol and filtered to yield the title compound (22 mg, 51%). The sodium salt was made by the procedure of Example 1D. MS (ESI−) m/z 500 (M−H)−. 1H NMR (300 MHz, DMSO-d6) δ 1.04 (d, J=6.62 Hz, 6 H) 1.87 (m, J=20.04, 13.42, 6.99 Hz, 1 H) 2.63 (m, 2 H) 5.13 (s, 2 H) 5.95 (t, J=6.99 Hz, 1 H) 7.08 (t, J=7.54 Hz, 1 H) 7.36 (d, J=9.19 Hz, 1 H) 7.57 (m, 2 H) 7.99 (d, J=8.82 Hz, 1 H) 8.09 (dd, J=7.91, 1.29 Hz, 1 H) 16.59 (s, 1 H).

1. customThe solvent was removed under a stream of warm nitrogen
2. customthe resulting residue was triturated with water
3. filtrationfiltered
4. customtriturated with methanol
5. filtrationfiltered