反应详情

To a solution of (3-aminomethyl-phenoxy)-acetic acid tert-butyl ester prepared in Step C of Preparation 20, (0.497 g, 2.09 mmol) in MeOH (8 mL) was added 4-tert-butylbenzaldehyde (0.33 mL, 1.97 mmol), and the mixture was stirred at room temperature for 2 h. The solution was cooled to 0° C. and sodium borohydride (0.119 g, 3.15 mmol) was added in one portion. The mixture was stirred for 10 min, and a 1:1 solution of water:aqueous saturated sodium bicarbonate was added to the solution. The product was extracted into CH2Cl2 (3×) and the combined organic solutions were dried (MgSO4) and concentrated in vacuo. The product was purified via silica gel chromatography (EtOAc followed by 5% MeOH in CH2Cl2) to give the title compound of Step A (0.691 g) as a clear oil. 1H NMR (400 MHz, CDCl3) δ 7.30-7.38 (m, 2H), 7.19-7.28 (m, 3H), 6.87-6.96 (m, 2H), 6.77 (d, 1H), 4.50 (s, 2H), 3.77 (s, 2H), 3.75 (s, 2H), 1.46 (s, 9H), 1.30 (s, 9H); MS 384 (M+1).

1. temperatureThe solution was cooled to 0° C.
2. stirringThe mixture was stirred for 10 min
3. extractionThe product was extracted into CH2Cl2 (3×)
4. dry with materialthe combined organic solutions were dried (MgSO4)
5. concentrationconcentrated in vacuo
6. customThe product was purified via silica gel chromatography (EtOAc followed by 5% MeOH in CH2Cl2)