Lithium borohydride → [9-Chloro-1-(6-methoxy-4-methylpyridin-3-yl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]methanol

Lithium borohydride (290 mg, 13.3 mmol) was added to a stirred solution of methyl 9-chloro-1-(6-methoxy-4-methylpyridin-3-yl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole-6-carboxylate (1.29 g, 3.33 mmol) in tetrahydrofuran (25 mL) at room temperature, and the mixture was stirred at 40° C. for 24 hr. The reaction was quenched by aqueous saturated ammonium chloride at 0° C. and the mixture was extracted with ethyl acetate. The combined organic layer was washed with brine, dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo. The residue was washed with diisopropyl ether to give the title compound as a colorless powder (1.19 g, 3.32 mmol, 99%).

1. customThe reaction was quenched by aqueous saturated ammonium chloride at 0° C.
2. extractionthe mixture was extracted with ethyl acetate
3. washThe combined organic layer was washed with brine
4. dry with materialdried over anhydrous magnesium sulfate
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. washThe residue was washed with diisopropyl ether

ORDレコード

ord-8a5cea4e8a254827988a091a25f6156b

出典データセット

uspto-grants-2014_07

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US08785460B2