2-Pyrrolidone → HCID 12799391, compound

Participants

Reaction Steps

A solution of 4-chlorophenothiazine (32.3 g., 0.134 mole) and 2-pyrrolidinone (23 g., 0.27 mole) in 125 ml. of 1,2-dichloroethane is added dropwise to a solution of phosphorus oxychloride (20.5 g., 0.134 mole) in 50 ml. of 1,2-dichloroethane in about 35 min. Isolation of the product from the reaction mixture according to the procedure of Example 1 provides 7.5 g., (17.1% yield) of 4-CHLORO-10-[1-(1-PYRROLIN-2-YL)-2-PYRROLIN- 2-YL]PHENOTHIAZINE free base, m.p. 195°-197° C. Analytically pure 4-CHLORO-10-[1-(1-PYRROLIN-2-YL)-2-PYRROLIN-2-YL]PHENOTHIAZINE HYDROCHLORIDE obtained by crystallization from ethanol-ether has a melting point of 232°-234° C. (corr.).

Provenance & Evidence