Dimethylformamide → HCID 18655619, compound

Participants

Reaction Steps

A solution of 200 mg (0.34 mmol) of the resultant compound of Example 141 and 98.4 μl (0.75 mmol) of triethylamine in 4 ml of dimethylformamide was treated with 68.0 μl (0.72 mmol) of acetic anhydride. After being stirred at ambient temperature for 2 h, the solution was diluted with water and extracted with four 10 ml portions of 10% methanol in dichloromethane. The combined organic layers were dried over MgSO4, and concentrated in vacuo. Silica gel chromatography of the residue using 10% methanol in dichloromethane provided 164.1 mg (72%) of the desired compound as a white solid. 1H NMR (DMSO-d6) δ 0.69-0.81 (four d, 12H), 1.76 (m, 1H), 1.84 (two s, 6H), 1.92 (m, 1H), 2.60 (dd, 2H), 2.74 (br d, 2H), 2.97 (dd, 1H), 3.67 (d, 2H), 3.72 (d, 2H), 3.85 (m, 1H), 4.02 (m, 2H), 4.17 (dd, 1H), 5.24 (d, 1H), 7.07-7.26 (m, 10H), 7.46(br d, 1H), 7.53 (br d, 1H), 7.56 (br d, 1H), 7.72(br d, 1H), 8.07 (br t, 1H), 8.12 (br t, 1H). Mass spectrum: (M+H)+ =667.

Provenance & Evidence