Triphenylphosphine → (s)-2-Benzyloxycarbonylamino-3-(6-chloro-purin-9-yl)-propionic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

To a suspension of 7.73 g (50 mmol) of 6-chloropurine in 350 ml of absolute THF were added 14.43 g (55 mmol) triphenylphosphine at −10 to 0° C. followed by 9.57 g (55 mmol) of diethyl azodicarboxylate and 14.8 g (50 mmol) of N-benzyloxycarbonyl-L-serine tert-butyl ester in 100 ml of absolute THF, and the mixture was stirred at 0° C. for 48 h. The solvent was evaporated, the residue was dissolved in EE/heptane (2:1), filtered and the solvent was removed in vacuo. The crude product was purified by flash chromatography on silica gel (EE/n-heptane (1:1) and DCM/EE (85:15)). Yield: 6.6 g.

Provenance & Evidence