反应详情

4-Nitrobenzyl bromide (11 g, 50 mmol) was dissolved in DMF (180 ml) and potassium carbonate (13.6 g, 99 mmol) added, followed by L-leucine cyclopentyl ester (Intermediate 8) (16 g, 43 mmol). The reaction was stirred for 18 h at RT. The residue was diluted with EtOAc (500 ml) and washed with water (3×100 ml), dried (Na2SO4) filtered and concentrated to dryness to give the crude product (15.8 g) which was used in the next step without further purification. LCMS purity 60%, m/z 335 [M+H]+.

1. washwashed with water (3×100 ml)
2. dry with materialdried (Na2SO4)
3. filtrationfiltered
4. concentrationconcentrated to dryness