Hydrochloric Acid → HCID 71656208, compound

Participants

Reaction Steps

Ethyl 7-(6-(2-acetoxyethyl)-2,3-di-p-tolyl-5H-pyrrolo[2,3-b]pyrazin-5-yl)heptanoate (step 4)(17 mg, 0.031 mmol) in EtOH (1 ml) at RT was treated with 2M NaOH (0.047 ml, 0.094 mmol) and stirred at RT for 4 hours. Further 2M NaOH (0.047 ml, 0.094 mmol) was added and the mixture was stirred at RT for 16 hours overnight. Further 2M NaOH (0.047 ml, 0.094 mmol) was added and the orange RM was stirred at RT overnight. The resulting mixture was added to water (30 ml) and the pH was adjusted to pH1 by addition of 2M HCl. The aqueous was extracted with DCM (×4) and the combined extracts were passed through a phase separating column and concentrated under reduced pressure to afford an orange oil. The oil was dissolved in EtOAc and an excess of iso-hexane was added. The resulting suspension was sonicated and removed by filtration. The filtrate was concentrated under reduced pressure and the crude product was dissolved in DCM (minimal) and loaded onto a S±20 mm×20 mm preparative TLC plate. Using a solvent system of 10% MeOH in DCM (200 ml) the TLC plate was eluted and the appropriate strip of Si on the plate was scrapped off the plate. The Si was suspended in 10% MeOH/DCM and sonicated. The suspension was filtered, rinsing the solid with 10% MeOH/DCM. The filtrate was concentrated under reduced pressure to afford the title compound;

Provenance & Evidence