反应详情

温度

0 °C

To dry ethyl ether (300 ml) is added with stirring lithium aluminum hydride (4.5 g; 0.12 mol) and cooled to 0° C. under nitrogen. The N-trityl-t-butyldimethylsilyloxy serine methyl ester (57 g; 0.12 mol) is added portionwise over 5 minutes as a solid. The reaction mixture is allowed to warm and stir for 30 minutes at 25° C. The mixture is quenched by slow addition of H2O (4.5 ml) at 0° C. followed by 15% NaOH (4.5 ml) and H2O (13.5 ml) at 25° C. After stirring for 3 hours, the mixture is filtered and the solid washed with THF. The combined filtrates are concentrated to which is added ether and petroleum ether to precipitate N-trityl-1,3-dihydroxy-2-propanamine which is used directly in Step D.

1. temperatureto warm
2. customThe mixture is quenched by slow addition of H2O (4.5 ml) at 0° C.
3. customfollowed by 15% NaOH (4.5 ml) and H2O (13.5 ml) at 25° C
4. stirringAfter stirring for 3 hours
5. filtrationthe mixture is filtered
6. washthe solid washed with THF
7. concentrationThe combined filtrates are concentrated to which
8. additionis added ether and petroleum ether
9. customto precipitate N-trityl-1,3-dihydroxy-2-propanamine which