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0 °C

To 2.26 g (93.0 mmol) of magnesium turnings in 20 ml of THF a solution of 16.7 g (62.0 mmol) of 4-(2-bromoethyl)-1-methoxy-2-methylindane in 80 ml of THF was added dropwise at reflux. The resulting mixture was additionally refluxed for 1 h, and then this Grignard reagent was titrated. To a suspension of 10.9 g (44.1 mmol) of anhydrous CeCl3 in 160 ml of THF 100 ml (44.1 mmol) of 0.441 M solution of the Grignard reagent was added at vigorous stirring for 15 min at 0° C., and then the reaction mixture was stirred at this temperature for 1.5 h. Further on, 5.83 g (44.1 mmol) of indanone-2 was added at 0° C. This mixture was stirred overnight at room temperature, and then 300 ml of 10% acetic acid was added. The product was extracted by 3×100 ml of ether. The combined extract was washed by brain and aqueous Na2CO3. The organic layer was separated, dried over Na2SO4, and evaporated to dryness. The title product was isolated by flash chromatography on Silica Gel 60 (40-63 um, d 50 mm, l 300 mm, eluent: hexanes/ether=3/1). Yield 10.7 g (75%) of a one diastereomer (as the starting material was one pure diastereomer).

1. temperatureat reflux
2. temperatureThe resulting mixture was additionally refluxed for 1 h
3. additionwas added
4. stirringthe reaction mixture was stirred at this temperature for 1.5 h
5. stirringThis mixture was stirred overnight at room temperature
6. extractionThe product was extracted by 3×100 ml of ether
7. extractionThe combined extract
8. washwas washed by brain and aqueous Na2CO3
9. customThe organic layer was separated
10. dry with materialdried over Na2SO4
11. customevaporated to dryness