tert-butyl-1-((S)-4-(3,4-dichlorophenyl)-3,4-dihydronaphthalen-2-yl)ethylcarbamate → tert-butyl 1-((2S,4S)-4-(3,4-dichlorophenyl)-1,2,3,4-tetrahydronaphthalen-2-yl)ethylcarbamate

Participants

Reaction Steps

To a solution of tert-butyl (S)-1-((S)-4-(3,4-dichlorophenyl)-3,4-dihydronaphthalen-2-yl)ethylcarbamate 49a (Example 21.3) (60 mg, 0.14 mmol) in ethyl acetate (8 mL) was added palladium on charcoal (30 mg, 5%). The mixture was then stirred under hydrogen (1 atm) for 1 h. The catalyst was filtered off through a pad of Celite. The filtrate was concentrated. Chiral AD column separation (ethanol/methanol/hexane/DEA=3:2:95:0.1) afforded tert-butyl 1-((2S,4S)-4-(3,4-dichlorophenyl)-1,2,3,4-tetrahydronaphthalen-2-yl)ethylcarbamate (isomer 2) (40 mg, 67%).

Provenance & Evidence