Phosphorus oxychloride → 9-chloro-5,6,7,8-tetrahydroacridine-3-carboxylic Acid
Reaction equation
O=[C:2]1[C:15]2[CH:14]=[CH:13][C:12]([C:16]([OH:18])=[O:17])=[CH:11][C:10]=2[NH:9][C:8]2[CH2:7][CH2:6][CH2:5][CH2:4][C:3]1=2.P(Cl)(Cl)([Cl:21])=O>>[Cl:21][C:2]1[C:3]2[CH2:4][CH2:5][CH2:6][CH2:7][C:8]=2[N:9]=[C:10]2[C:15]=1[CH:14]=[CH:13][C:12]([C:16]([OH:18])=[O:17])=[CH:11]2Participants
3
Conditions
- Temperature
- 100 °C
Procedure
A suspension of 9-oxo-5,6,7,8,9,10-hexahydro-acridine-3-carboxylic acid (VIa) (10 g, 4.1 mmols) in phosphorous oxychloride (50 mL) was heated to 100° C. for 1 h. Reaction completion was monitored by TLC. After completion, the reaction mixture was cooled to 25° C. and excess phosphorous oxychloride was removed under vacuum. The residue was mixed with ice (50 g) and the pH was adjusted to 4-5 with solid sodium bicarbonate. The solid obtained was filtered, washed with water (250 mL) and dried under vacuum to get 9.6 g (88%) of compound (Vila) as a white solid.