(3S)-N-tert-butyl-1,2,3,4-tetrahydroisoquinoline-3-carboxamide

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 5.7 kg of benzyl 3(S)-(t-butylcarbamoyl)-1,2,3,4-tetrahydro-2-isoquinolinecarboxylate were dissolved in 40 l of ethanol and hydrogenated in an autoclave in the presence of 1.1 kg of 10% palladium-charcoal at a pressure of 10 bar and an internal temperature of 20°-25°. After approximately 2 hours the hydrogen uptake ceased, whereupon the content of the autoclave was filtered, the autoclave and the filter residue were each rinsed twice with 20 l of ethanol each time and the combined filtrates were evaporated, whereby approximately 3.6 kg of crude N-t-butyl-1,2,3,4-tetrahydro-3(S)-isoquinoline-carboxamide were obtained as a beige solid. an internal temperature of 20°-25° was filtered each rinsed twice with 20 l of ethanol each time the combined filtrates were evaporated