反应详情

2-[4-(2-Benzyloxyacetylamino)-phenoxy]-propionic acid methyl ester 51 (15 gm, 43.7 mmol) was dissolved in methanol (150 ml) in a pressure vessel. Palladium on carbon (5%, 8 g) was added and the mixture stirred under a hydrogen atmosphere (2.5 kg) for 10 hrs. Catalyst was removed by filtration and the methanol distilled off. The crude 52 was recrystallised in chloroform:hexane (1:6) to give pure 52 (4 g, 36.3%) as a white powder with an m.p. between 111-112.6° C. IH NMR (CDCl3) δ 1.60 (d, 3H, CH3), 3.44 (bt, 1H, OH), 3.78 (s, 3H, Ester), 4.14 (d, 1H, CH2OH), 4.72 (q, 1H, CH), 6.80 (d, 2H, Ar), 7.44 (d, 2H, Ar), 8.30 (s, 1H, NH)

1. customCatalyst was removed by filtration
2. distillationthe methanol distilled off
3. customThe crude 52 was recrystallised in chloroform:hexane (1:6)