Hydrochloric Acid → 2-[2-(3,4-Dichlorophenyl)-4-(3,4,5-trimethoxybenzoyl)morpholin-2-yl]ethyl 4-nitrobenzenesulfonate

Participants

Reaction Conditions

Reaction Steps

To a solution of 2-[2-(3,4-dichlorophenyl)morpholin-2-yl]ethanol (5 g, 18.0 mmol) in methylene chloride (25 ml) was added triethylamine (7.5 ml, 54.0 mmol) under a nitrogen stream, the resulting mixture was cooled to 0-5° C., then a solution of 3,4,5-trimethoxybenzoyl chloride (4.2 g, 18.4 mmol) in methylene chloride (20 ml) was further added dropwise at below 10° C. After the resulting mixture was stirred at 0-5° C. for one hour, dimethylaminopyridine (0.22 g, 1.8 mmol) was further added. Subsequently, a solution of 4-nitrobenzenesulfonyl chloride (4.8 g, 21.6 mmol) in methylene chloride (10 ml) was further added dropwise at below 10° C., and the resulting mixture was stirred at room temperature for 30 minutes. After completion of the reaction, to the reaction mixture were added successively water (50 ml) and concentrated hydrochloric acid (5 ml), and the resulting mixture was partitioned. The separated organic layer was washed with water twice (50 ml each) and evaporated to dryness. Subsequently, to the obtained residue was added toluene (45 ml), and the resulting mixture was refluxed to dissolve the residue. The solution thus obtained was cooled to 0-5° C. over about one hour, and stirred at the same temperature for one hour. The crystals precipitated were collected by filtration and dried at 50° C. for 15 hours in vacuo to afford the title compound [11.2 g, yield: 94.9%] as a pale yellow crystalline solid.

Provenance & Evidence