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To a solution of 46 (375 mg, 0.711 mmol) in a mixture of EtOH (5 mL) and toluene (5 mL) at RT was added phenylacetyl isothiocyanate (189 mg, 1.066 mmol) and the reaction mixture was stirred at RT for 3 hours. The mixture was concentrated to dryness then purified by column chromatography (eluent a gradient of 80% EtOAc in hexane to EtOAc), to afford 47 (400 mg, 80%) as a red solid. MS (m/z): 705.2 (M+H).

1. concentrationThe mixture was concentrated to dryness
2. customthen purified by column chromatography (eluent a gradient of 80% EtOAc in hexane to EtOAc),