Triethylamine → tert-butyl N-[1-(2,3-dichlorophenyl)-2-hydroxyethyl]carbamate

Participants

Reaction Conditions

Reaction Steps

Of the compound from Example 181A, 702 mg (2.19 mmol) were dissolved in 7 ml of THF under argon and cooled to 0° C. Then 306 μl (2.19 mmol) of triethylamine and 313 μl (2.41 mmol) of isobutyl chloroformate were added dropwise. The suspension was stirred at 0° C. for 1 h. It was filtered through a Seitz frit into a cooled flask, with washing with a little THF. The resulting filtrate was added slowly dropwise to a solution, cooled to 0° C., of 249 mg (6.58 mmol) of sodium borohydride in 1.5 ml of water. After 1 h, the batch was cautiously admixed with saturated aqueous sodium hydrogen carbonate solution and extracted with ethyl acetate. The organic phase was also washed once with saturated aqueous sodium hydrogen carbonate solution and once with saturated aqueous sodium chloride solution. It was dried over sodium sulphate, filtered and freed from the solvent on a rotary evaporator. Drying in an HV gave 537 mg (56% of theory) of the title compound in 70% purity.

Provenance & Evidence