反应详情

A solution of diisobutylaluminum hydride in toluene (1.00 M, 2.10 mL, 0.0021 mol) was slowly added to a solution of 1-(1,3-benzothiazol-6-yl)cyclopropanecarbonitrile (0.28 g, 0.0014 mol, prepared in Example 79, Steps 1-3) in toluene (2 mL) at −78° C. The mixture was slowly warmed to RT and stirred overnight. After cooling to −60° C., isopropyl alcohol (0.32 mL) was carefully added. The mixture was warmed to 0° C., and saturated potassium sodium tartrate (50 mL) was added, and stirred at RT for 30 min. The mixture was extracted with ethyl acetate (3×40 mL). The organic layers were washed with brine, dried over anhydrous Na2SO4, filtered, and concentrated under reduced pressure. The residue was flash chromatographed on a silica gel column with 40% ethyl acetate in hexanes to afford 1-(1,3-benzothiazol-6-yl)cyclopropanecarbaldehyde. Analytical LCMS: (M+H)+=204.0.

1. temperatureAfter cooling to −60° C.
2. temperatureThe mixture was warmed to 0° C.
3. stirringstirred at RT for 30 min
4. extractionThe mixture was extracted with ethyl acetate (3×40 mL)
5. washThe organic layers were washed with brine
6. dry with materialdried over anhydrous Na2SO4
7. filtrationfiltered
8. concentrationconcentrated under reduced pressure
9. customchromatographed on a silica gel column with 40% ethyl acetate in hexanes