5-Aminovaleric acid → 5-(4-Dimethylaminobenzenesulphonylamino)valeric acid

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Reaction Steps

4.4 g of 4-dimethylaminobenzenesulphonyl chloride (Chem. Ber. 43, 3038, (1910)) are added to a solution comprising 2.34 g of 5-aminovaleric acid and 2.4 g of sodium hydroxide dissolved in 24 cm3 of water, followed by the addition of 24 cm3 of tetrahydrofuran in order to obtain a solution. The temperature rises to 36° C. The mixture is kept stirring for 4 hours, the tetrahydrofuran is evaporated off, the reaction medium is acidified using acetic acid and extracted with chloroform, the organic phase is dried and the solvents are removed under reduced pressure. 3.7 g of expected product are obtained. M.p. 105°-110° C. After crystallization in an isopropanol/water mixture (1:1), the product, melting point 118°-120° C., is obtained.

Provenance & Evidence