Lithium Hydroxide → HCID 58011789, compound

Participants

Reaction Steps

The compound from Example 138A (360 mg) is dissolved in 10 ml methanol and treated with 4.2 ml of a 1 M aqueous lithium hydroxide solution. The mixture is stirred overnight at RT and then freed of methanol on the rotary evaporator. The residue is diluted with 200 ml water and slowly acidified to pH 2 with 1 N hydrochloric acid. The aqueous phase is extracted three times with ethyl acetate, the combined organic phases dried over sodium sulphate and the solvent removed on the rotary evaporator. The residue is dissolved in a little DMSO and purified by preparative HPLC (Method 20). 246 mg (0.75 mmol) of the title compound are obtained.

Provenance & Evidence