反应详情

A solution of 2-amino-5-(S)-aminomethyl-6-(1-(S)-phenyl-ethyl)-4,5,6,7-tetrahydro-thieno[2,3-c]pyridine-3-carboxylic acid tert-butyl ester (500 mg, 1.29 mmol) and 4-phenoxybenzaldehyde (256 mg, 1.29 mmol) was heated to 50° C. in ethanol (50 ml) for 1 hour in the presence of molecular sieves (4 A, 5 ml). The reaction mixture was cooled on an ice bath before sodium borohydride (98 mg, 2.59 mmol) was added in three portions over 45 min. The cooling bath was removed and the reaction mixture was allowed to reach room temperature. The mixture was filtered through a plug of Celite and the filter cage was washed with dichloromethane (3×25 ml). The solvent was removed in vacuo and the residue was redissolved in ethyl acetate (50 ml), washed with sodium bicarbonate (50 ml) and dried (MgSO4). The solvent was removed in vacuo before the residue was redissolved in acetonitrile (20 ml). Triethylamine (130 mg, 1.29 mmol), di-tert-butyl dicarbonate (282 mg, 1.29 mmol) and 4-(N,N-dimethyl-amino)pyridine (5 mg, cat.) was added and the reaction mixture was stirred for 16 hours at room temperature. The volatiles were removed in vacuo and ethyl acetate (50 ml) was added and the solution was washed with saturated sodium bicarbonate (50 ml) and dried (MgSO4). The crude product was purified by column chromatography (SiO2, petroleum ether-ethyl acetate (9:1)) to give 325 mg (38% overall) of 2-amino-5-(S)-((4-phenoxy-benzylamino)methyl)-6-(1-(S)-phenyl-ethyl)-4,5,6,7-tetrahydro-thieno[2,3-c]pyridine-3-carboxylic acid tert-butyl ester.

1. additionwas added in three portions over 45 min
2. customThe cooling bath was removed
3. customto reach room temperature
4. filtrationThe mixture was filtered through a plug of Celite
5. washthe filter cage was washed with dichloromethane (3×25 ml)
6. customThe solvent was removed in vacuo
7. dissolutionthe residue was redissolved in ethyl acetate (50 ml)
8. washwashed with sodium bicarbonate (50 ml)
9. dry with materialdried (MgSO4)
10. customThe solvent was removed in vacuo before the residue
11. dissolutionwas redissolved in acetonitrile (20 ml)
12. customThe volatiles were removed in vacuo and ethyl acetate (50 ml)
13. additionwas added
14. washthe solution was washed with saturated sodium bicarbonate (50 ml)
15. dry with materialdried (MgSO4)
16. customThe crude product was purified by column chromatography (SiO2, petroleum ether-ethyl acetate (9:1))