Acetic Acid → Urea, N-(5-(2-fluorophenyl)-2,3-dihydro-1-methyl-2-oxo-1H-1,4-benzodiazepin-7-yl)-N(sup 1)-(2-hydroxyethyl)-

Participants

Reaction Steps

300 mg (0.73 mM) of 2-[3-[5-(o-fluorophenyl)-2,3-dihydro-1-methyl-2-oxo-1H-1,4-benzodiazepin-7-yl]ureido]ethyl acetate dissolved in 20 ml of absolute methanol are treated with 500 mg of sodium methylate and stirred at room temperature for 1 hour. The mixture is then buffered with a small amount of acetic acid and concentrated. The residue is treated with methylene chloride/10% sodium bicarbonate solution, the aqueous solution is extracted several times with methylene chloride and the organic solution is dried over sodium sulphate, filtered and concentrated. After crystallisation from acetone, there is obtained 1-[5-(o-fluorophenyl)-2,3-dihydro-1-methyl-2-oxo-1H-1,4-benzodiazepin-7-yl]-3-(2-hydroxyethyl)urea which according to the IR spectrum is identical with a sample of this substance prepared in another manner (see Example 7).

Provenance & Evidence