反应详情

Combine 5-(tetrahydropyran-2-yloxy)benzofuran-7-carboxaldehyde (3.75 g, 0.015 mol) with lithium cyanide-tetrahydrofuran (1:1.5 complex, 0.215 g, 0.1 equivalent) in tetrahydrofuran (80 mL) under nitrogen. Add diethyl cyanophosphonate (3.0 mL, 1.3 equivalents) and stir at 20° C. for 2 days. Add tert-butanol (1.6 mL, 1.1 equivalents) then SmI2 in tetrahydrofuran (0.1 M solution, approximately 400 mL). Concentrate the solution in vacuo then redissolve in a solution of ethyl acetate:diethyl ether (approximately 3:1, 100 mL). Add saturated aqueous ammonium chloride and stir for 20 min, until the release of hydrogen cyanide is complete. Filter to remove insoluble material, then extract against 1 N hydrochloric acid. Dry over sodium sulfate, then filter and concentrate. Purification by a plug column (4:1 hexanes:ethyl acetate) to provide the title compound as a light yellow oil.

1. concentrationConcentrate the solution in vacuo
2. dissolutionthen redissolve in a solution of ethyl acetate
3. filtrationFilter
4. customto remove insoluble material
5. extractionextract against 1 N hydrochloric acid
6. dry with materialDry over sodium sulfate
7. filtrationfilter
8. concentrationconcentrate
9. customPurification by a plug column (4:1 hexanes:ethyl acetate)