反应详情

4-(1H-Indol-3-yl)butyric acid (232 mg, 1.0 mmol.), the mixture of the diastereoisomers of (4-aminomethyl-1-phenylcyclohexyl)dimethylamine (203 mg, 1.0 mmol.) and 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium chloride (415 mg, 1.5 mmol.) were dissolved in abs. methanol and stirred for 20 h at RT. For working up, the mixture was concentrated and the residue was taken up in water (15 ml), adjusted to pH 11 with 5M NaOH and extracted with EE (4×20 ml). The organic phase was washed with 1M NaOH (3 ml), dried, filtered and concentrated. The residue was a mixture of the bases of the diastereoisomeric target products, which were separated by flash chromatography on silica gel (45 g) (eluant: 700 ml methanol/EE 3:1). The non-polar diastereoisomer was obtained in a yield of 163 mg (0.39 mmol.) and was dissolved in 2-butanone/ethanol (7 ml/2 ml); isopropanolic 5M HCl (125 μl, 0.62 mmol.) was added and stirring was carried out for 2 h at RT. Concentration and drying in vacuo yielded the hydrochloride of the non-polar diastereoisomer of N-(4-dimethylamino-4-phenylcyclohexylmethyl)-2-(1H-indol-3-yl)butyramide in the form of a slightly hygroscopic white solid (177 mg, m.p. 95–100° C.).

1. dissolutionwere dissolved in abs
2. concentrationthe mixture was concentrated
3. extractionextracted with EE (4×20 ml)
4. washThe organic phase was washed with 1M NaOH (3 ml)
5. customdried
6. filtrationfiltered
7. concentrationconcentrated
8. additiona mixture of the bases of the diastereoisomeric target products, which
9. customwere separated by flash chromatography on silica gel (45 g) (eluant: 700 ml methanol/EE 3:1)
10. customThe non-polar diastereoisomer was obtained in a yield of 163 mg (0.39 mmol.)
11. concentrationConcentration
12. customdrying in vacuo