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0 °C

A solution of nickel (II) chloride hexahydrate (78 mg, 0.328 mmol) and (E)-2-[3-chloro-4-(5-methyl-tetrazol-1-yl)-phenyl]-3-cyclohexyl-acrylic acid methyl ester (295 mg, 0.82 mmol) in methanol (8 mL) was cooled to 0° C. and then treated with sodium borohydride (186 mg, 4.92 mmol) in four 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 24 h. The reaction mixture was then concentrated in vacuo, and the residue was diluted with water (30 mL) and ethyl acetate (50 mL). The two layers were separated. The organic layer was washed successively with a 3N aqueous hydrochloric acid solution (1×50 mL), a saturated aqueous sodium bicarbonate solution (1×50 mL) and a saturated aqueous sodium chloride solution (1×50 mL), dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo to afford racemic 2-[3-chloro-4-(5-methyl-tetrazol-1-yl)-phenyl]-3-cyclohexyl-propionic acid methyl ester (285 mg, 96%) as a viscous oil: EI-HRMS m/e calcd for C18H23ClN4O2 (M+) 362.1509, found 362.1516.

1. additionAfter the addition
2. temperatureto warm to 25° C. where it
3. stirringwas stirred for 24 h
4. concentrationThe reaction mixture was then concentrated in vacuo
5. additionthe residue was diluted with water (30 mL) and ethyl acetate (50 mL)
6. customThe two layers were separated
7. washThe organic layer was washed successively with a 3N aqueous hydrochloric acid solution (1×50 mL)
8. dry with materiala saturated aqueous sodium bicarbonate solution (1×50 mL) and a saturated aqueous sodium chloride solution (1×50 mL), dried over anhydrous magnesium sulfate
9. filtrationfiltered
10. concentrationconcentrated in vacuo