Sodium borohydride → [1-methyl-5-(oxetan-3-yloxy)-3-trifluoromethyl-1H-pyrazol-4-yl]-methanol

1-Methyl-5-(oxetan-3-yloxy)-3-trifluoromethyl-1H-pyrazole-4-carbaldehyde (11.6 g, 46.4 mmol) was dissolved in methanol (100 ml) and sodium borohydride (0.87 g, 23.0 mmol) was added in portions at 0° C. After stirring at 0° C. for 2 hours the mixture was concentrated and the oil was dissolved in dichloromethane (100 ml). The solution was washed with water and brine, dried over magnesium sulfate and concentrated to give the product as yellow solid (8.14 g) which was used in the next step without further purification.