反应详情

To a solution of 6-methoxycarbonyl-1-methylindole (prepared by the method of Example 1(b), but using 6-bromo-1-methylindole in place of 6-bromo-1-ethylindole, 5g) in tetrahydrofuran (30 ml) at −70° C. under a nitrogen atmosphere, was added diisobutyl aluminium hydride (66 ml of a 1.0M solution in tetrahydrofuran) dropwise with stirring. The solution was stirred at −70° C. for 15 mins then warmed to room temperature for 2 hours. The mixture was diluted with water (100 ml) and partitioned between ethyl acetate and aqueous sodium hydroxide. The aqueous layer was re-extracted with ethyl acetate and combined organic extracts were dried (MgSO4) and evaporated to give crude product which was purified by flash column chromatography using 80% ethyl acetate/20% hexane eluant to give the subtitle compound as a clear oil which solidified on standing (4.1 g).

1. customat −70° C.
2. stirringThe solution was stirred at −70° C. for 15 mins
3. custompartitioned between ethyl acetate and aqueous sodium hydroxide
4. extractionThe aqueous layer was re-extracted with ethyl acetate
5. dry with materialwere dried (MgSO4)
6. customevaporated
7. customto give crude product which
8. customwas purified by flash column chromatography