Ammonia → 8-{[(2S)-2-(Hydroxymethyl)pyrrolidin-1-yl]sulfonyl}-3,3-dimethyl-3,4-dihydropyrimido[1,2-a]indol-10(2H)-one

Participants

Reaction Conditions

Reaction Steps

A mixture of 3-[5′-({(2S)-2-[(benzyloxy)methyl]pyrrolidin-1-yl}sulfonyl)-2′-oxospiro[1,3-dioxane-2,3′-indol]-1′(2′H)-yl]-2,2-dimethylpropanenitrile (3.00 g, 5.56 mmol), wet Raney Nickel (3.18 g) in 2M EtOH.NH3 (180 mL) and THF (30 mL) was hydrogenated at 54 lb/in2 H2 for 22 hr. The reaction was filtered through Sulka Floc and the filtrate was poured into a steel pressure vessel and heated to 132° C. for 18 hr. After cooling to room temperature the reaction was concentrated. The crude product was purified on Biotage KP silica gel eluting with CH2Cl2/CH3OH/NH4OH (98.5/1/0.5) to give the title compound as a white solid (1.77 g, 60% ). NMR (400 MHz, DMSO-d6): consistent.

Provenance & Evidence