p-Toluenesulfonic acid → HCID 59280184, compound

Participants

Reaction Steps

661 mg (3.0 mmol) of the compound from Example 2A and 586 mg (3.0 mmol) of the compound from Example 17A are initially charged in 10 ml of ethanol. 114 mg (0.6 mmol) of p-toluenesulfonic acid are added, and the mixture is stirred under reflux for 16 h. The mixture is then allowed to cool to RT, and the solid formed is filtered off, washed once with ethanol and dried under high vacuum. The solid is then stirred in tert-butyl methyl ether for 30 min, filtered off again and dried under high vacuum (batch 1). The filtrates and wash solutions obtained beforehand are combined and concentrated, and the residue is stirred in saturated sodium bicarbonate solution. The solid obtained is filtered off and washed once with water, and the filter residue is then purified by preparative HPLC (RP18 column; mobile phase: acetonitrile/water gradient with addition of 0.1% TFA to the water). The product fractions are combined and concentrated (batch 2).

Provenance & Evidence