tert-Butyl bromoacetate → 2-[1-(2,3-Dihydro-benzo[1,4]dioxin-2-ylmethyl)-pyrrolidin-3-ylmethoxy]-ethanol

温度

0 °C

To a solution containing 50 mg (0.19 mmol) of [1-(2,3-dihydro-benzo[1,4]dioxin-2-ylmethyl)-pyrrolidin-3-yl]-methanol in dichloromethane (1.5 mL), 1.5 mL of cold aqueous NaOH-solution (50%, w/w) and 6 mg (0.02 mmol) of tert-butylammonium bromide were added at 0° C. The reaction mixture was stirred for ½ h at 0° C. After adding 28 μL (0.19 mmol) of tert-butylbromoacetate the stirring was continued for 3 h at 10° C. Subsequent addition of water (10 mL) and dichloromethane (40 mL) was followed by stirring the mixture for additional 10 min at room temperature. The phases were separated, and the organic phase was washed with 5% NaHCO3 (1×20 mL), dried over anhydrous sodium sulfate, filtered, and evaporated to dryness. The crude product was dried under high vacuum and redissolved in dry tetrahydrofuran (4 mL) and reduced with 15 mg (0.40 mmol) of LiAlH4 using the same procedure as above. The crude product was purified by column chromatography (silica gel, methanol/triethylamine/ethyl acetate, 1:1:99).

1. additionwere added at 0° C
2. waitwas continued for 3 h at 10° C
3. stirringby stirring the mixture for additional 10 min at room temperature
4. customThe phases were separated
5. washthe organic phase was washed with 5% NaHCO3 (1×20 mL)
6. dry with materialdried over anhydrous sodium sulfate
7. filtrationfiltered
8. customevaporated to dryness
9. dry with materialThe crude product was dried under high vacuum
10. dissolutionredissolved in dry tetrahydrofuran (4 mL)
11. customThe crude product was purified by column chromatography (silica gel, methanol/triethylamine/ethyl acetate, 1:1:99)

ORDレコード

ord-2d06f10cb88048e28650baec8803448b

出典データセット

uspto-grants-2013_07

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US08492549B2