反应详情

温度

22 °C

A solution of oxalyl chloride (0.38 ml, 4.32 mmol) in dichloromethane (30 ml) is cooled to −78° C. and is treated slowly with dimethylsulfoxide (0.51 ml, 7.2 mmol). After 20 min at −78° C., a solution of (4-methyl-2-{6-[3-(2-methylpyrrolidin-1-yl)propoxy]pyridin-3-yl}-4,5-dihydro-1,3-oxazol-4-yl)methanol ax56 (1.2 g, 80% purity, ca. 3.0 mmol) in dichloromethane (10 ml) is added dropwise over 10 min. After 60 min at −78° C., triethylamine (2.5 ml, 18 mmol) is added and the mixture is allowed to warm to 22° C. Water is then added and after vigorous stirring, the organic layer is separated and the aqueous phase extracted twice with dichloromethane. The combined organic layers are washed with brine, dried over sodium sulfate and concentrated in vacuo to yield 1.2 g of ca. 80% pure 4-methyl-2-{6-[3-(2-methylpyrrolidin-1-yl)propoxy]pyridin-3-yl}-4,5-dihydro-1,3-oxazole-4-carbaldehyde ax57.

1. waitAfter 60 min at −78° C.
2. customafter vigorous stirring, the organic layer is separated
3. extractionthe aqueous phase extracted twice with dichloromethane
4. washThe combined organic layers are washed with brine
5. dry with materialdried over sodium sulfate
6. concentrationconcentrated in vacuo