Benzyl 3-(3-(tert-butoxycarbonyl)benzyl)-4-oxo-1-phenyl-1,3,8-triazaspiro[4.5]decane-8-carboxylate → Tert-butyl 3-((4-oxo-1-phenyl-1,3,8-triazaspiro[4.5]decan-3-yl)methyl)benzoate

Participants

Reaction Steps

A solution of benzyl 3-(3-(tert-butoxycarbonyl)benzyl)-4-oxo-1-phenyl-1,3,8-triazaspiro[4.5]decane-8-carboxylate (5 g, 9.0 mmol, 1 equiv) in a mixture of ethyl acetate and ethanol was charged with 10% palladium on carbon (1 g, 20%/wt) and the resulting mixture was stabilized to a hydrogen atmosphere. The reaction was stirred as such for 2 h, filtered through Celite and the filtrate was concentrated in vacuo to afford the title compound as a grey foam (3.69 g, 97%); 1H NMR (400 MHz, DMSO-d6): δ 1.52 (s, 9H); 1.54-1.56 (m, 2H); 2.43-2.49 (m, 2H); 2.88-2.93 (m, 2H); 3.18-3.24 (m, 2H); 4.58 (s, 2H); 4.62 (s, 2H); 6.74 (t, 2H, J=6.8 and 7.6 Hz); 6.88 (d, 2H, J=8 Hz); 7.18-7.22 (m, 2H); 7.49-7.55 (m, 2H); 7.79-7.85 (m, 2H); MS for C25H31N3O3 m/z 422.24 (M+H)+.

Provenance & Evidence