Thiophene → HCID 57983265, compound

Participants

Reaction Steps

A mixture of intermediate (28) (0.083 mol) and butylaldehyde (7 g) in methanol (300 ml) was hydrogenated with palladium-on-carbon (10%) (2 g) as a catalyst in the presence of a thiophene solution (3 ml). After uptake of hydrogen (1 equivalent), the catalyst was filtered over celite and the filtrate was evaporated. The residue was dissolved in aqueous HCl 2N (500 ml). The mixture was washed with toluene and then separated into its layers. The aqueous layer was basified with 50% aqueous NaOH and then extracted three times with toluene. The combined organic layer was dried, filtered and the solvent was evaporated, yielding 29 g of (trans)-4-[[bis(phenylmethyl)amino]-methyl]-1-butyl-3-piperidinol (intermediate 29).

Provenance & Evidence