Реакция #79580

Уравнение реакции

(S)-(+)-1-amino-2-propanol

p-anisaldehyde

acetic acid

sodium triacetoxyborohydride

→

ammonia

title compound

(2S)-1-[(4-Methoxybenzyl)amino]-2-propanol

Растворители

methanol

Условия реакции

Обработка

1. 1
   КонцентрированиеThe reaction mixture was concentrated under reduced pressure
2. 2
   Другоеthe residue was partitioned between dichloromethane (150 ml) and sodium hydroxide solution (100 ml, 0.5N)
3. 3
   ДругоеThe layers were separated
4. 4
   Экстракцияthe aqueous phase was extracted with further dichloromethane (4×30 ml)
5. 5
   СушкаThe combined organic solutions were dried (MgSO4)
6. 6
   Концентрированиеconcentrated under reduced pressure
7. 7
   ДругоеThe residual yellow oil was purified by column chromatography on silica gel using an elution gradient of dichloromethane

Методика

A mixture of (S)-(+)-1-amino-2-propanol (9 g, 0.12 mol), p-anisaldehyde (5.45 g, 0.04 mol), acetic acid (5 ml), and sodium triacetoxyborohydride (9.5 g, 0.045 mol) in methanol (80 ml) was stirred at room temperature for 72 hours. The reaction mixture was concentrated under reduced pressure and the residue was partitioned between dichloromethane (150 ml) and sodium hydroxide solution (100 ml, 0.5N). The layers were separated, and the aqueous phase was extracted with further dichloromethane (4×30 ml). The combined organic solutions were dried (MgSO4) and concentrated under reduced pressure. The residual yellow oil was purified by column chromatography on silica gel using an elution gradient of dichloromethane:methanol:0.88 ammonia (98:2:0.2 to 95:5:0.5) to afford the title compound, 6.2 g. 1H-NMR (CDCl3, 400 MHz) δ: 1.10 (d, 3H), 2.24-2.40 (m, 2H), 2.65 (dd, 1H), 3.62-3.80 (m, 6H), 6.82 (d, 2H), 7.19 (d, 2H). LRMS: m/z (ES+) 218 [MNa+]

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