(3-chlorophenyl) N,N-diethylcarbamate

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of lithium diisopropylamine (2M in THF) (21.40 ml; 42.8 mmol) in dry tetrahydrofuran (117 ml) under nitrogen atmosphere at −78° C. was added 3-chlorophenyl diethylcarbamate (8.86 g; 38.91 mmol). The reaction mixture was stirred for 30 min at −78° C., and iodine (0.669 g; 46.7 mmol) was added. The solution was stirred for 30 min. at 0° C. and was then allowed to warm up to room temperature for 2 h. The reaction mixture was quenched by adding water and the organics were removed under reduced pressure. The aqueous phase was extracted with ethyl acetate, washed with a solution of hydrochloric acid 1 N, dried over magnesium sulphate, filtered and concentrated under reduced pressure to afford 8.32 g (55%) of 3-chloro-2-iodophenyl diethylcarbamate as brown solid. The solution was stirred for 30 min. at 0° C. to warm up to room temperature for 2 h The reaction mixture was quenched by adding water the organics were removed under reduced pressure The aqueous phase was extracted with ethyl acetate washed with a solution of hydrochloric acid 1 N dried over magnesium sulphate filtered concentrated under reduced pressure

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 3-chlorophenol (10 g; 78 mmol) in dry tetrahydrofuran (78 ml) under a nitrogen atmosphere was added sodium hydride (60% in oil) (6.22 g; 156 mmol) in small portions. The reaction was stirred at room temperature for 1 h and diethylcarbamic chloride (19.71 ml; 156 mmol) was slowly added and the reaction was stirred at room temperature for 21 h. The reaction was quenched with water, concentrated under reduced pressure, extracted with ethyl acetate. The combined organic layers were washed with brine, dried over magnesium sulphate, filtered and concentrated under reduced pressure. Purification by flash-chromatography on silica gel using a gradient of ethyl acetate (0-40%) in heptane furnished 9.86 g (56%) of 3-chlorophenyl diethylcarbamate. the reaction was stirred at room temperature for 21 h The reaction was quenched with water concentrated under reduced pressure extracted with ethyl acetate The combined organic layers were washed with brine dried over magnesium sulphate filtered concentrated under reduced pressure Purification by flash-chromatography on silica gel using a gradient of ethyl acetate (0-40%) in heptane