反应详情

A mixture of (2S)1-Amino-3-(4-benzyloxy-phenoxy)-propan-2-ol (1.64 g, 6 mmol) and 1-(diphenylmethyl)-3-azetidinone (1.19 g, 5 mmol) in methanol (20 ml) was treated with trimethylorthoformate (1.59 g, 15 mmol), and stirred at room temperature for 2 days. The resulting suspension was filtered, and the precipitate washed with 3×5 ml of methanol, and dried in vacuo to give 1.96 g of a white solid. The methanol filtrate was evaporated, and the residue was dissolved in ethyl acetate. The ethyl acetate solution was filtered through a pad of silica gel, and eluted with 2×30 ml of ethyl acetate. The combined filtrate was evaporated, and the residue triturated with a mixture of ether and hexanes to give an additional 0.30 g of product; m.p. 141-142° C.; MS (ES) m/z 748 (MH+); HRMS (EI) Calcd. for C32H32N2O3 (M+): 492.2413, Found: 492.2397.

1. filtrationThe resulting suspension was filtered
2. washthe precipitate washed with 3×5 ml of methanol
3. customdried in vacuo