Hydrochloric Acid → 4-[(3,20-Dioxopregn-4-en-11-yl)oxy]-4-oxobutanoic acid

Participants

Reaction Steps

According to the general principles outlined by Erlanger et al. (Method in Immunology and Immunochemistry Vol. I, p. 148, Ed. C. A. Williams and M. W. Chase. Academic Press N.Y., 1967), and by Buzby et al. (J. Med. Chem. 10:199, 1967), a solution of 11α-hydroxyprogesterone (10 g) (Sigma Chem. Co., St. Louis, MO) and of succinic anhydride (10 g) in dry pyridine (100 ml) was prepared and refluxed under nitrogen atmosphere for 20 hours. The cooled reaction mixture was poured into cold aqueous hydrochloric acid (3 N, 500 ml) containing crushed ice, and extracted with chloroform. After evaporation of the chloroform, the residue was recrystallized repeatedly from acetone-hexane, and from acetone yielding 4.5 gm of white crystals, melting point 148°-152° C. Absorption maximum in 0.1 NaOH was at 243 nm. These characteristics were consistent with those described in the literature (Lindner et al., Steroids 19:357-375, 1972) for 11α-hydroxyprogesterone hemisuccinate.

Provenance & Evidence