反应详情

A solution of hexamethyldisilazane lithium amide (205 mg, 1.11 mmol) in dry hexane/benzene (1:4) solution (5 ml) is stirred on an oil bath at 90° C. and thereto is dropwise added a solution of cyanohydrin ethoxyethyl ether which is 15-chloro-2-(1-ethoxyethoxy)-3-(1-methylethyl)-6, 10,14-trimethyl-3,5,9,13-pentadecatetraenenitrile (115 mg, 0.26 mmol) in dry benzene (6 ml) over 20 minutes. After stirring the mixture at this temperature for 5 minutes, a saturated aqueous ammonium chloride solution is added while stirring on an ice-water bath. The organic layer is extracted with ether (20 ml×2) and the solvent is removed by distillation under reduced pressure to give 1-(1-ethoxyethoxy)-2-(1-methylethyl)-5,9,13-trimethyl-2,4,8,12 -cyclotetradecatetraene-1-carbonitrile (51.6 mg, 50%) as a mixture of diastereomers. This product is subjected to silica gel column chromatography (n-hexane/ether =20:1) to give one isomer of the above formula.

1. customover 20 minutes
2. stirringwhile stirring on an ice-water bath
3. extractionThe organic layer is extracted with ether (20 ml×2)
4. customthe solvent is removed by distillation under reduced pressure