Acetic Acid → (7R,7aR)-2-chloro-4-(7-hydroxy-7a-methyl-3-oxotetrahydropyrrolo[1,2-c]imidazol-2-yl)-3-methylbenzonitrile

Participants

Reaction Steps

To a solution of (7R,7aR)-4-[7-(tert-Butyldimethylsilanyloxy)-7a-methyl-3-oxotetrahydropyrrolo[1,2-c]imidazol-2-yl]-2-chloro-3-methylbenzonitrile (58E) (17 mg, 0.04 mmol) in THF (2 mL) was added acetic acid (100 □L) and a 1 M solution of TBAF in THF (122 □L, 0.12 mmol). After stirring at rt for 11 h, additional TBAF solution was added (100 □L), and after stirring for another 6 h, 200 □L TBAF solution was added. The reaction was stirred overnight, then 100 □L TBAF was added and the reaction stirred an additional 1.5 h. The reaction was then quenched with saturated aqueous NH4Cl and extracted with EtOAC. The organic layer was washed with brine, dried (MgSO4), filtered, and concentrated under reduced pressure. The resulting residue was purified via preparative HPLC (Luna C-18, 100×21.2 mm, eluting with 40-100% solvent B (A=90% H2O—10% MeOH—0.1% TFA and B=10% H2O—90% MeOH—0.1% TFA) over 10 min; Flow rate at 20 mL/min; UV detection at 220 nm) to provide the title compound (11 mg). LC/MS m/z 306 [M+H]+.

Provenance & Evidence