Boron tribromide → HCID 135502651, compound

Participants

Reaction Steps

4 ml of 1 M boron tribromide solution in dichloromethane are added to 0.2 g (0.59 mmol) of 6-cyclopentylmethyl-1-(2-ethoxyphenyl)-1,5-dihydro-4H-pyrazolo[3,4-d]pyrimidin-4-one (Example 12), and the reaction mixture was stirred at room temperature for 1 h. Aqueous hydrolysis is followed by extraction with dichloromethane. The product is purified by preparative HPLC (YMC Gel ODS-AQ S 5/15 μm; eluent A: water, eluent B: acetonitrile; gradient: 0 min 30% B, 5 min 30% B, 50 min 95% B). 0.167 g (91% of theory) of the product is obtained as a colourless solid.

Provenance & Evidence