Tert-butyl 4-(2-methoxy-2-oxoethylidene)piperidine-1-carboxylate → tert-Butyl 4-(2-methoxy-2-oxoethyl)piperidine-1-carboxylate

Participants

Reaction Steps

tert-Butyl 4-(2-methoxy-2-oxoethylidene)piperidine-1-carboxylate (35.71 g, 140 mmol) was dissolved in a mixture of ethyl acetate (110 mL) and methanol (110 mL). 50% wet 10% palladium on carbon (3.3 g) was added to the mixture. Reaction vessel was charged with 55 psi of hydrogen gas. Reaction shook on a Parr apparatus at room temperature for 16 hours. Reaction mixture was filtered to remove the catalyst. Filtrate was concentrated in vacuo. Title compound was obtained as clear colorless oil in 97% yield. 1H NMR (300 MHz, CDCl3): δ=4.04 (d, J=10.25, 2H), 3.64 (s, 3H), 2.68 (t, J=12.44, 2H), 2.21 (d, J=6.95, 2H), 1.98-1.77 (m, 1H), 1.64 (d, J=13.5, 2H), 1.41 (s, 9H), 1.25-0.99 (m, 2H).

Provenance & Evidence