Water → HCID 70674429, compound

Participants

Reaction Conditions

Reaction Steps

Di-tert-butyl (4S)—N-(tert-butoxycarbonyl)-4-{4-[3-(tosyloxy)propyl]benzyl}-L-glutamate (see Example 10) (100 mg, 0.15 mmol) was dissolved in 1 ml acetonitrile, and tetra-n-butylammonium tetra-(tert-butyl alcohol)-coordinated fluoride (Angew. Chem. 2008, 120, 8532-8534) (169 mg, 0.30 mmol) were added. The mixture was stirred at 70° C. for 2 h. Another 169 mg of the fluoride source was added and the reaction stirred for further 1.5 h at 70° C. After cooling to room temperature, the mixture was poured into water (10 ml) and extracted with tert-butyl methyl ether (3×10 ml). The organic phases were dried over magnesium sulfate and concentrated in vacuo. The residue was purified on a reversed phase (RP-18) column with an acetonitrile/water gradient. The appropriate fractions were collected, the acetonitrile evaporated under reduced pressure and the remaining aqueous solution was lyophilized.

Provenance & Evidence