反应详情

A suspension of 4-amino-N-(4-nitrostyrylsulfonyl)benzamidine (6.9 g., 0.02 mole) in 120 ml. of acetone is stirred with 50% sodium hydroxide (6.4 g., 0.08 mole) in 40 ml. of water for 1 hr. Concentration of the reaction mixture affords a residue which is stirred with 50 ml. of water, filtered, washed with water, and dried. Trituration of the dried filter cake with isopropyl alcohol yields 5.3 g. (95%) of N-(4-nitrostyryl)-4-aminobenzamidine free base, m.p. 195°-197° C. (dec.) The free base (5.0 g.) dissolved in 400 ml. of hot 1:1 methanolacetone and acidified with ethanolic hydrogen chloride provides 3.5 g. of analytically pure 4-AMINO-N-(4-NITROSTYRYL)BENZAMIDINE HYDROCHLORIDE as a yellow solid, m.p. 247°-248° C. (dec.)(corr.) Concentration of the mother liquors and trituration of the residue provided an additional 2.6 g. of the hydrochloride salt.

1. customConcentration of the reaction mixture affords a residue which
2. filtrationof water, filtered
3. washwashed with water
4. customdried
5. filtrationTrituration of the dried filter cake with isopropyl alcohol
6. customyields 5.3 g
7. customprovides 3.5 g