4-Methylmorpholine → (S)-1-(3,4,5-trimethoxybenzoyl)-3-(3,4-dichlorophenyl)-3-(2-methanesulfonyloxyethyl)pyrrolidine

Participants

Reaction Conditions

Reaction Steps

Combine (S)-3-(3,4-dichlorophenyl)-3-(2-hydroxyethyl)pyrrolidine (R,R)-di-p-anisoyltartaric acid salt (9.05 kg, 13.3 mol), potassium carbonate (6.42 kg) in acetone (27.2 kg). Cool to about 5° C. and add water (8.3 gal). Cool to about 3° C. and slowly add a solution of 3,4,5-trimethoxybenzoyl chloride (14.0 kg, 26.9% in 1,2-dimethoxethane, 16.3 mol) over about 25 minutes. When the reaction is complete, warm to 25° C. Dilute the reaction mixture with toluene (36.35 kg). Separate the layers and extract the organic layer with a solution of water (2 gal) and 3M aqueous hydrochloric acid solution (2 kg) and then brine. Concentrate the organic layer in vacuo until about 5 gallons remainsb. Add toluene (182 kg) and again concentrate in vacuo until about 5 gallons remain. Add toluene (36.15 kg) and cool to about -3° C. Add N-methylmorpholine (6.85 kg, 67.7 mol) and then methanesulfonyl chloride (3.40 kg, 29.7 mol). When the reaction is complete add water (4.8 gal) and warm to about 25° C. Separate the layers and extract the organic layer with a 3M aqueous hydrochloric acid solution (18.1 kg). Separate the layers to give a solution of (S)-1-(3,4,5-trimethoxybenzoyl)-3-(3,4-dichlorophenyl)-3-(2-methanesulfonyloxyethyl)pyrrolidine.

Provenance & Evidence