Dicyclohexylcarbodiimide → HCID 23387550, compound

Participants

Reaction Steps

To a mixture of DCC (14.8 g, 72 mmol), DMAP (0.88 g, 7.2 mmol) and 4-methoxybenzyl 4,5-dihydroxy-2,2-dimethyl-valerate (20.3 g, 72 mmol) in CH2Cl2 (400 mL) at 0° C., was added dropwise a solution of N-CBz-L-valine (16.2 g, 65 mmol) in CH2Cl2 (100 mL). After 1 h at 0° C., the temperature of the reaction mixture was allowed to assume room temperature and then the mixture was stirred for 5 h at room temperature. The mixture was filtered through a glass filter and the solvent was removed under reduced pressure. The crude product was column chromatographed (silica gel, 2→5% MeOH in CH2Cl2), to give 22.4 g 4-methoxybenzyl 5-(N-CBz-L-valyloxy)-4-hydroxy-2,2-dimethylvalerate.

Provenance & Evidence