反应详情

Sodium iodide (19 mg; 0.13 mmol) was added to a solution of chloroacetamide 6 (40 mg; 0.12 mmol), piperidine 7.6 (31 mg; 0.15 mmol) and DIPEA (30 μL; 0.17 mmol) in 3:1 acetonitrile:THF (2 mL). After 22 h the reaction was filtered through a short plug of silica gel with THF as a wash. The solution was concentrated in vacuo then purified on silica gel (20 mL) with 10:1 EtOAc:i-PrOH yielding a hard white foam (59.2 mg; 98%). LC (method B) tR=12.9 min; 1H NMR (200 MHz, CDCl3) δ 9.51 (s, 1H), 8.37 (m, 2H), 7.47 (m, 3H), 7.38 (m, 1H), 7.31-7.14 (m, 2H), 7.02-6.86 (m, 2H), 6.72 (brs, 1H), 5.69 (brt, J=5.6 Hz, 1H), 4.48 (m, 1H), 3.67 (m, 2H), 3.53 (m, 2H), 3.19 (s, 2H), 2.90 (m, 2H), 2.56 (m, 2H), 2.20-2.00 (m, 4H), 1.86 (s, 3H). ESIMS 523.0/525.0 (100/42) [MH+], 262 (58), 198 (75).

1. filtrationAfter 22 h the reaction was filtered through a short plug of silica gel with THF as a wash
2. concentrationThe solution was concentrated in vacuo
3. customthen purified on silica gel (20 mL) with 10:1 EtOAc