Trifluoroacetic acid → HCID 86619856, compound

Participants

Reaction Steps

A solution of example 26, 3-aza-bicyclo[3.2.2]nonan-3-yl(3-(3-fluoro-4-(pyrrolidin-1-ylmethyl)phenyl)-3-hydroxycyclobutyl)methanone (0.59 g, 1.48 mmol) in trifluoroacetic acid (2.5 mL) and 1,2-dichloroethane (16 mL) was refluxed for 20 h and concentrated to give crude 3-aza-bicyclo[3.2.2]nonan-3-yl(3-(3-fluoro-4-(pyrrolidin-1-ylmethyl)phenyl)cyclobut-2-enyl)methanone trifluoroacetate salt as a dark purplish-brown oil, with residual TFA. This material was dissolved in EtOH (40 mL) and added to a hydrogenation bottle containing 10% palladium on carbon (93 mg) slurried in EtOH (˜3 mL). The mixture was shaken at room temperature under 48 psi of hydrogen for 2 h, filtered through diatomaceous earth with an EtOH rinse and concentrated to yield an orange oil. This was dissolved in EtOAc and washed with aqueous K2CO3 and brine, dried over MgSO4 and concentrated to afford 0.38 g of light orange oil. Flash chromatography on a 2″×3.5″ silica gel column flushing with 2% MeOH/EtOAc (500 mL) and then eluting with 500 ml each 5% and 10% MeOH/EtOAc afforded 0.256 g (45%) of the title compound as a light orange oil: Rf=0.21 (20% MeOH/EtOAc).

Provenance & Evidence