4-Methylmorpholine → HCID 66688142, compound

Participants

Reaction Conditions

Reaction Steps

A solution consisting of 10 g of Boc-D-Phe-OH, 40 ml of tetrahydrofuran and 4.6 ml of N-methylmorpholine is slowly dripped into a solution of 5.4 ml of isobutyl chloroformate in 60 ml of tetrahydrofuran cooled to 0° C., at a rate such that the inner temperature does not exceed 5° C. The resulting mixture is maintained under stirring at 0° C. for 0.5 hours. A solution consisting of 8.0 g of (11) in 20 ml of tetrahydrofuran is then dripped into the reaction mixture at a rate such that the temperature does not exceed 5° C. The solution is maintained under stirring at 0° C. for 1 hour, and at ambient temperature for 5 hours. 100 ml of 1M NaOH is added to the mixture, and the tetrahydrofuran is evaporated at low pressure. The residue is taken up with dichloromethane and water; the organic phase is washed with water (2×), and after a solvent change with ethyl acetate at low pressure, compound (12) is crystallised from ethyl acetate to obtain 15 g of white solid. Yield 87%.

Provenance & Evidence