反应详情

The racemic 1-methylethyl 4-[1-({5-[4-(methylsulfonyl)phenyl]-2-pyrazinyl}oxy)ethyl]-1-piperidinecarboxylate (prepared as in Example 162) was subjected to Chiral HPLC [column: AS-H, column mobile phase: 85% CO2: 15% MeOH (2 mL/min), pressure 140 bar, temperature 40° C., 215 nm] analysis and then separated to give two (R and S) enantiomers, which were further purified by chromatography on an ISCO silica gel column using 0 to 50% EtOAc/hexanes. The title compound was isolated as a white foam with Tr of 17.00 min (second eluting peak). The (R) absolute stereochemistry was assigned by Ab initio VCD analysis.

1. customseparated
2. customto give two (R and S) enantiomers, which
3. customwere further purified by chromatography on an ISCO silica gel column