Acetic Acid → 3-t-Butyldiphenylsilyloxy-1-(4-cyano-1,3-thiazol-2-yl)azetidine

Temperatur

50 °C

To a solution of 3-t-butyldiphenylsilyloxy-1-(4-ethoxycarbonyl-1,3-thiazol-2-yl)azetidine (7.73 g, 16.6 mmol) (obtained as described in Reference Example 2(1)) in benzene (370 ml) was added a solution of 0.67M ammonium chloride-trimethylaluminium in benzene (75 ml) at room temperature under an atmosphere of nitrogen. The mixture was stirred in a water bath (50° C.) for 17 hours. After checking the completion of the reaction, 10% aqueous acetic acid solution (100 ml) and ethyl acetate (50 ml) were added to the reaction mixture in an ice bath and the resulting mixture was stirred at room temperature for 30 minutes. The reaction mixture was extracted with ethyl acetate. The organic layer was washed successively with saturated aqueous sodium hydrogencarbonate solution and saturated aqueous sodium chloride solution, dried over anhydrous magnesium sulfate, filtered and concentrated under reduced pressure. The residue was purified by chromatography on a silica gel column using n-hexane:ethyl acetate (3:1) as the eluant to afford 3-t-butyldiphenylsilyloxy-1-(4-cyano-1,3-thiazol-2-yl)azetidine (6.98 g, yield 76%) as a pale brown solid.

1. customat room temperature
2. additionwere added to the reaction mixture in an ice bath
3. stirringthe resulting mixture was stirred at room temperature for 30 minutes
4. extractionThe reaction mixture was extracted with ethyl acetate
5. washThe organic layer was washed successively with saturated aqueous sodium hydrogencarbonate solution and saturated aqueous sodium chloride solution
6. dry with materialdried over anhydrous magnesium sulfate
7. filtrationfiltered
8. concentrationconcentrated under reduced pressure
9. customThe residue was purified by chromatography on a silica gel column

ORD-Eintrag

ord-a72f4c29ce87434a828759af5f6b3cf3

Quelldatensatz

uspto-grants-2006_02

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07001897B2