反应详情

To a suspension of 0.86 g NaH in 40 mL of dry THF are added 5.0 g 2-methyl-1-tetralon in 20 mL of THF. After stirring for 30 min, 7.5 g ethyl-5-bromo-pentanoate in 20 mL of THF are added and the mixture is refluxed for 6 h. The cooled mixture is poured into water and extracted with ethylacetate. The extract is evaporated yielding crude ethyl-5-(2-Methyl-1-oxo-1,2,3,4-tetrahydro-naphthalen-2-yl)-pentanoate (6a) which is purified by column chromatography, yielding 3.6 g of pure 6a. 6a is converted to 6b in an analogous manner to that described for the conversion of 1c to 1d in example 1. 6b was obtained as an oil, MS (APCI): 274.1 (M−1).

1. temperaturethe mixture is refluxed for 6 h
2. extractionextracted with ethylacetate
3. customThe extract is evaporated