Triethyl phosphite → (5-t-Butyl-oxazol-2-ylmethyl)-phosphonic acid diethyl ester

Participants

Reaction Steps

A solution of 2-(chloromethyl)-5-t-butyloxazole (8.00 g, 46.1 mmol) in triethylphosphite (15.3 g, 92.0 mmol) was heated at 120° C. for 18 hours. After cooling the mixture to room temperature, toluene (30 mL) was added and the solution was concentrated in vacuo with a bath temperature of 70° C. This procedure was repeated three times and the resulting brown oil was dried in vacuo at 90° C. for 30 minutes to give (5-t-butyl-oxazol-2-ylmethyl)-phosphonic acid diethyl ester (12.4 g, 98%, C12H22NO4P, MS m/e 276 (M+H)+) as a red-orange liquid.

Provenance & Evidence