Trifluoroacetic acid → HCID 86741801, compound

Participants

Reaction Steps

The product of Example 12 was deprotected by reaction with trifluoroacetic acid in anisole. The reaction mixture was incubated at room temperature for one hour, following which trifluoroacetic acid and anisole were removed in vacuo at 32° C. The reaction mixture was then partitioned between saturated NaHCO3 and ethyl acetate in the cold. The bicarbonate phase was washed twice with ethyl acetate and once with ether. Then, in the presence of ethyl acetate, the bicarbonate phase was acidified with HCl, and, after extraction, the ethyl acetate phase was collected and washed with saturated NaCl, dried over anhydrous MgSO4 and filtered. The solvent was removed under reduced pressure. The product was further purified by chromatography on Sephadex G-25, trademark Pharmacia Company, Uppsala, Sweden, using a 1.2 cm×96 cm column eluted with butanol:acetic acid:water, 4:1:5 (volume ratio). 2.20 me fractions were collected. Most of the product was found in fractions 21 through 23 as determined by positive reaction with o-tolidine/chlorine reagent and with phenazine methosulfate at pH 5.

Provenance & Evidence