反应详情

The amine from example 24 (24.8 g, 0.10 mol) was dissolved in dichloromethane (700 ml) and to this was added triethylamine (20.86 ml, 0.115 mol). The reaction mixture was stirred and cooled to 0° C., before propionyl chloride (7.12 ml, 0.082 mol) was added dropwise. The reaction mixture was then allowed to warm to room temperature over 16 hours before quenching with 3M HCl (aq) (20 ml) and water (100 ml). The reaction mixture was then extracted with dichloromethane (3×200 ml) and the combined organic layers dried over anhydrous magnesium sulphate, filtered and concentrated in vacuo to give the title compound as a clear viscous gum (27.5 g, 0.092 mol, 90%). 1H NMR (CDCl3, 400 MHz) δ: 1.10 (t 3H), 2.19 (q, 2H), 3.32-3.43 (m, 4H), 4.81 (s, 2H), 5.11 (m, 1H), 6.99 (4, 2H), 7.25-7.42 (m, 7H). LRMS: m/z 298 (M-H−).

1. additionwas added dropwise
2. custombefore quenching with 3M HCl (aq) (20 ml) and water (100 ml)
3. extractionThe reaction mixture was then extracted with dichloromethane (3×200 ml)
4. dry with materialthe combined organic layers dried over anhydrous magnesium sulphate
5. filtrationfiltered
6. concentrationconcentrated in vacuo