反应详情

Sodium hydride (60% oil dispersion, 0.51 g, 12.4 mmol) was added to a stirring solution of (R)-methyl 1-oxo-1,2,3,4-tetrahydroisoquinoline-3-carboxylate (1.3 g, 6.2 mmol) in DMF (13 ml). After stirring for 30 min at ambient temperature, methyl 2-bromopropionate (1.1 ml, 9.3 mmol) was added. After stirring at 40° C. for 2 h, the reaction was removed from the heat and quenched with water. The reaction mixture was transferred to a separatory funnel with EtOAc/water. Extraction with EtOAc (2×) and washing the combined organic layers with saturated NaHCO3, water, and brine and drying over MgSO4 afforded 2.0 g of crude product after evaporation of the solvent. Flash chromatography (SiO2, hexanes to 80% EtOAc in hexanes) afforded Isomer A (0.53 g, 29% yield), Isomer B (0.28 g, 15% yield) and a mixture of the two isomers (0.28 g, 15% yield). All have MS (ESI) 292 (M+H).

1. stirringAfter stirring at 40° C. for 2 h
2. customthe reaction was removed from the
3. temperatureheat
4. customquenched with water
5. customThe reaction mixture was transferred to a separatory funnel with EtOAc/water
6. extractionExtraction with EtOAc (2×)
7. washwashing the combined organic layers with saturated NaHCO3, water, and brine
8. dry with materialdrying over MgSO4
9. customafforded 2.0 g of crude product
10. customafter evaporation of the solvent
11. customFlash chromatography (SiO2, hexanes to 80% EtOAc in hexanes) afforded Isomer A (0.53 g, 29% yield), Isomer B (0.28 g, 15% yield)
12. additiona mixture of the two isomers (0.28 g, 15% yield)