Benzylamine → N-benzyl-O-methyl-N2-trityl-D-serinamide

Participants

Reaction Steps

To a solution of Example 2 product (i.e., O-methyl-N-trityl-D-serine, 50 g) in tetrahydrofuran (500 ml), N-methyl morpholine (20.9 g) was added at −15° C. in 5-10 minutes. The reaction mixture was stirred for 15 minutes and then isobutylchloroformate (18.8 g) diluted with tetrahydrofuran was added to it at −15° C. under nitrogen atmosphere in 15-20 minutes. The solution was stirred for 15 minutes and benzyl amine (14.7 g) was added to it at −15° C. in 15 minutes. The solution was allowed to cool to room temperature and stirred for 2 hours. The solvent was recovered from the solution. Dichloromethane (250 ml) was added to the crude product and stirred for 5 minutes to dissolve. The dichloromethane layer was washed or stirred for 5 minutes with water (250 ml). The layers were separated and the dichloromethane layer was again washed with 5% NaHCO3 (250 ml). The layers were separated and then the dichloromethane layer was sequentially washed with 5% citric acid solution (250 ml) and then with water (250 ml). The solvent was recovered at 40° C. to 45° C. to get oil. Ethyl acetate was added to the oil and the mixture was heated to 60° C. to 65° C. to dissolve. The clear solution so formed was cooled up to room temperature and then hexanes (350 ml) were added to it. It was stirred for 1 hour at room temperature, filtered and then dried to get compound of Formula Va. Yield=30 gm.

Provenance & Evidence