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温度

0 °C

A solution of nickel (II) chloride hexahydrate (115 mg, 0.24 mmol) and (E)-3-cyclopentyl-2-[3-fluoro-4-(5-methyl-tetrazol-1-yl)-phenyl]-acrylic acid methyl ester (400 mg, 1.21 mmol) in methanol (10 mL) was cooled to 0° C. and then treated with sodium borohydride (275 mg, 3.63 mmol) in two portions. After the addition, the black reaction mixture was stirred for 15 min at 0° C. and then allowed to warm to 25° C. where it was stirred for 15 h. The reaction mixture was concentrated in vacuo, and the residue was diluted with a 3N aqueous hydrochloric acid solution (30 mL) and ethyl acetate (50 mL). The two layers were separated. The organic layer was washed with a saturated aqueous sodium chloride solution (1×50 mL), dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo to afford racemic 3-cyclopentyl-2-[3-fluoro-4-(5-methyl-tetrazol-1-yl)-phenyl]-propionic acid methyl ester (400 mg, 99%) as a viscous oil: EI-HRMS m/e calcd for C17H21FN4O2 (M+) 332.1648, found 332.1645.

1. additionAfter the addition
2. temperatureto warm to 25° C. where it
3. stirringwas stirred for 15 h
4. concentrationThe reaction mixture was concentrated in vacuo
5. additionthe residue was diluted with a 3N aqueous hydrochloric acid solution (30 mL) and ethyl acetate (50 mL)
6. customThe two layers were separated
7. washThe organic layer was washed with a saturated aqueous sodium chloride solution (1×50 mL)
8. dry with materialdried over anhydrous magnesium sulfate
9. filtrationfiltered
10. concentrationconcentrated in vacuo