反应详情

温度

80 °C

A suspension of 4-(1,4-dioxa-spiro[4.5]dec-8-yl)-morpholine hydrochloride (6.79 g, 25.7 mmol, as prepared in the previous step) in THF (100 mL) was treated with HCl (38.6 mL, 77.2 mmol, 2M aq) and heated to 80° C. for 4 h. The cooled mixture was treated with satd aq NaHCO3 to pH 7 and extracted with ether (3×250 mL). The combined organic layers were dried over MgSO4 and concentrated in vacuo to afford the title compound (2.22 g, 47%) as a colorless oil. 1H-NMR (CDCl3; 400 MHz): δ 3.78-3.72 (m, 4H), 2.60-2.55 (m, 4H), 2.36-2.25 (m, 2H), 2.09-1.99 (m, 2H), 1.93-1.82 (m, 2H).

1. extractionextracted with ether (3×250 mL)
2. dry with materialThe combined organic layers were dried over MgSO4
3. concentrationconcentrated in vacuo