Hydrogen Sulfide → HCID 14536531, compound

Participants

Reaction Conditions

Reaction Steps

A solution of 10-[1-(1-pyrrolidinyl)-2-propyl]-2-phenothiazinecarbothioamide, D series (2.5 g) and propylamine (8.3 cc) in absolute ethanol (50 cc) is saturated with hydrogen sulphide and heated for 16 hours to a temperature in the region of 100° C. After cooling, the orange solution obtained is concentrated to dryness under reduced pressure (30 mm Hg; 4 kPa) at 40° C. The residual brown oil is purified by chromatography on a column (height: 25 cm; diameter: 2 cm) of silica gel (0.04-0.063 mm) with a slight excess pressure of nitrogen (40 kPa), eluting with a mixture (80:20 by volume) (1 liter) of ethyl acetate and cyclohexane and collecting 40-cc fractions. The combined fractions 8 to 18 are concentrated to dryness under reduced pressure (30 mm Hg; 4 kPa) at 40° C. N-Propyl-10-[1-(1-pyrrolidinyl)-2-propyl]-2-phenothiazinecarbothioamide, D series (2.4 g) is thereby obtained in the form of a yellow oil {[α]D20 =22±0.5° (0.06%; methanol)}. This oil is dissolved in 2-propanol (7.5 cc) at a temperature in the region of 50° C., and this solution is poured with stirring into a solution of fumaric acid (0.68 g) in 2-propanol (7.5 cc) at a temperature in the region of 60° C. Stirring is continued for 2 hours at a temperature in the region of 5° C. The solid formed is drained, washed with 2-propanol (2×2 cc) and dried under reduced pressure (5 mm Hg; 0.68 kPa) at 40° C. N-Propyl-10-[1-(1-pyrrolidinyl)-2-propyl]-2-phenothiazinecarbothioamide acid fumarate, D series (2 g) is thereby obtained in the form of a yellow solid, m.p. 206° C., the NMR characteristics of which are identical to those described in Example 13.

Provenance & Evidence