反应详情

The diastereoisomer mixture of (4-dimethylamino-4-phenylcyclohexylmethyl)-carbamic acid phenyl ester (774 mg, 2.2 mmole) was added to the suspension of 5-chloro-3-piperidine-4-yl-1H-indole (516 mg, 2.2 mmole) in dioxane (20 ml). The reaction mixture was a suspension also at 100° C., and was boiled under reflux for 40 hours. To work up the suspension the existing precipitate was filtered off, washed with dioxane (1×1 ml) and diethyl ether (3×2 ml) and dried in vacuo. The isolated solid (183 mg, 17%, m.p. 140°-150° C.) was a still unpurified part of the polar diastereoisomer of 4-(5-chloro-1H-indol-3-yl)piperidine-1-carboxylic acid-(4-dimethylamino-4-phenylcyclohexylmethyl)-amide, which was purified by flash chromatography on silica gel [20 g, eluent: methanol (500 ml)]. The mother liquor and the wash phases were concentrated by evaporation in vacuo. The residue contained in addition to phenol, also the two diastereoisomers of 4-(5-chloro-1H-indol-3-yl)piperidine-1-carboxylic acid-(4-dimethylamino-4-phenylcyclohexylmethyl)-amide. The diastereoisomers were separated and purified by flash chromatography on silica gel (75 g). Methanol/EE (1:1; 900 ml) was used as eluent. The non-polar diastereoisomer (335 mg, m.p. 205°-207° C., 31%) and the polar diastereoisomer of 4-(5-chloro-1H-indol-3-yl)piperidine-1-carboxylic acid-(4-dimethylamino-4-phenylcyclohexylmethyl)-amide (115 mg, m.p. 140°-143° C., 11%) were thereby obtained as pale yellow solids.

1. customalso at 100° C.
2. temperatureunder reflux for 40 hours
3. filtrationwas filtered off
4. washwashed with dioxane (1×1 ml) and diethyl ether (3×2 ml)
5. customdried in vacuo
6. customwas purified by flash chromatography on silica gel [20 g, eluent: methanol (500 ml)]
7. concentrationThe mother liquor and the wash phases were concentrated by evaporation in vacuo
8. additionThe residue contained in addition to phenol
9. customThe diastereoisomers were separated
10. custompurified by flash chromatography on silica gel (75 g)