Ethyl orthoformate → HCID 51030866, compound

Participants

Reaction Steps

(4R,5S)-1-(3,4-diaminophenyl)-3-(4-methoxybenzyl)-5-(4-methoxyphenyl)-4-methylimidazolidin-2-one (0.105 g, 0.24 mmol) obtained from step F was dissolved in 3 mL triethyl orthoformate. The reaction was stirred for 30 minutes at reflux. After cooling the solvent was removed and the remains were dissolved in 8 mL trifluoroacetic acid. The reaction was stirred for 14 hours at ambient temperature. The TFA was removed under reduced pressure and the residue was re-dissolved in 20 mL of buffer (pH7) and three times extracted by means of 25 mL dichloromethane. The combined organic layers were washed with brine, dried over sodium sulfate, filtrated and the solvent was removed under reduced pressure. The final product was purified by FPLC using a chloroform-methanol gradient (0→10%). The product elutes at about 5% methanol.

Provenance & Evidence