Phosphorus oxychloride → HCID 21863575, compound

Participants

Reaction Steps

Phosphorus oxychloride was added dropwise to dry dimethylformamide (1:1.2 molar ratio) at 0° C. under nitrogen. A solution of 1,6-di(10H-10-phenothiazinyl)hexane (obtained in the previous step) in dry DMF was added stepwise to the reaction flask. The reaction mixture was stirred at 70° C. until the starting compound reacted completely as indicated by TLC. The reaction mixture was cooled to room temperature, poured into ice water, and neutralized with a dilute KOH solution until the pH reached 7-8. The aqueous solution was extracted several times with chloroform. The combined chloroform solutions were washed with water, dried with anhydrous sodium sulfate, and filtered. The solvent was removed by distillation. The crude product was purified by column chromatography using a mixture of ethyl acetate and hexane in a volume ratio of 1:8 as the eluent. The yield of 10-[6-(3-formyl-10H-10-phenothiazinyl)hexyl]-10H-3-phenothiazine carbaldehyde was 56%. The 1H-NMR spectrum of the product in CDCl3 was characterized by the following chemical shifts (δ, ppm): 1.35-1.50 (m, 4H), 1.55-1.90 (m, 4H), 3.82 (t, 4H), 6.73-7.19 (m, 14H), and 9.80 (s, 2H).

Provenance & Evidence