HCID 178418395、化合物 → HCID 178527778、化合物

278.4 gm of the product of Example 1 (0.4 mol.), 133.8 gm of 2-mercaptobenzothiazole (0.8 mol.), 8 gm of Aliquat 336 (phase transfer catalyst obtained from Aldrich Chemical Company: tricaprylylmethyl ammonium chloride), 200 ml caustic solution (32 gm sodium hydroxide dissolved in 200 ml water), and 400 ml toluene were mixed in a 2-liter reactor. The reactants were stirred under reflux for six hours, and then cooled to ambient temperature. The aqueous phase was separated, and the organic phase was twice washed with 400 ml of water. Thereafter, toluene was removed by vacuum distillation leaving a dark fluid as the desired product (373 gm). It was further purified by hot filtration through Super-Cel.