反应详情

To a solution of ethyl 1-(2-({[(1,1-dimethylethyl)(dimethyl)silyl]oxy}methyl)-6-{[(methyloxy)methyl]oxy}phenyl)cyclopropanecarboxylate (Intermediate 133, 780 mg) in dry tetrahydrofuran (20 ml) at 0° C., a solution of LiAlH4 in THF (1M, 2.076 mL, 2.076 mmol) was slowly added and the reaction mixture was stirred for 2 hours at the same temperature. The reaction was quenched with water (10 ml) and brine (10 ml) and diluted with ethyl acetate (30 ml). The solid was filtered off and two phases were separated. The aqueous layer was extracted with ethyl acetate (30 ml) and the combined organic layers were dried over sodium sulphate, filtered and evaporated to afford the alcohol intermediate as a colourless oil. It was dissolved in dry tetrahydrofuran (20.00 mL) and TBAF 1M solution in THF (2.076 mL, 2.076 mmol) was slowly added at 0° C. The reaction mixture was stirred for 1 hour at the same temperature. The reaction was quenched with water (10 ml) and brine (10 ml) and extracted with ethyl acetate (2×30 ml). The organic layer was dried over sodium sulphate, filtered and evaporated and the residue was purified by flash chromatography (Biotage system) on silica gel using a 50 g SNAP column and cyclohexane/ethyl acetate as eluents from 7:3 to 3:7. This afforded the title compound (450 mg) as a white crystal solid.

1. customThe reaction was quenched with water (10 ml) and brine (10 ml)
2. additiondiluted with ethyl acetate (30 ml)
3. filtrationThe solid was filtered off
4. customtwo phases were separated
5. extractionThe aqueous layer was extracted with ethyl acetate (30 ml)
6. dry with materialthe combined organic layers were dried over sodium sulphate
7. filtrationfiltered
8. customevaporated