4-Nitrobenzenesulfonyl chloride → HCID 12071413, compound

Participants

Reaction Steps

(3R)-1,2,3,4-Tetrahydro-3-isoquinolinecarboxylic acid (5.32 g) and sodium hydroxide (2.40 g) are added to a mixture of methylene chloride-water (200 ml--200 ml), and thereto is added dropwise a solution of 4-nitrophenylsulfonyl chloride (6.62 g) in methylene chloride (100 ml) under ice cooling over a period of 30 minutes. The mixture is stirred under ice cooling for 3 hours, and thereto are further added sodium hydroxide (1.20 g) and a solution of 4-nitrophenylsulfonyl chloride (3.32 g) in methylene chloride (60 ml) in this order. The mixture is stirred under ice cooling for 2 hours, and further stirred at room temperature for 17 hours, and the reaction mixture is diluted with chloroform and 10% hydrochloric acid. The chloroform layer is collected and washed with water and then with an aqueous saturated saline solution, dried over sodium sulfate and then treated with active carbon. Undissolved materials are filtered off from the chloroform layer, and the solvent is distilled off under reduced pressure. The residue is purified with a silica gel column chromatography (eluent, chloroform) and recrystallized from ethyl acetate-hexane to give (3R)-N-(4-nitrophenylsulfonyl)-1,2,3,4-tetrahydro-3-isoquinolinecarboxylic acid (4.01 g) as colorless crystals.

Provenance & Evidence