4-[(3-chloro-6-methylphenanthridin-5(6H)-yl)carbonyl]phenol → 4-{[(6R)-3-chloro-6-methylphenanthridin-5(6H)-yl]carbonyl}phenol

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The enantiomers of 4-[(3-chloro-6-methylphenanthridin-5(6H)-yl)carbonyl]phenol (400 mg, 1.14 mmol) were separated by automated, on-column solvent change, preparative, normal phase, chiral chromatography on a Chiralpak AD (20 mm×250 mm) column eluting with 20% ethanol in hexane at a flow rate of 12 mL/min with. After combination of fractions and evaporation of the solvent in vacuo, one peak (99.9%) with a retention time of 3.571 minutes was isolated as a white solid (194 mg, 97% based upon a 1:1 ratio of enantiomers with a theoretical maximum amount of 200 mg). mp 273.5-276° C.; [α]D25=−321° (c=0.010 g/mL, CHCl3); 1H NMR (400 MHz, DMSO-d6) δ ppm 1.21 (d, J=6.73 Hz, 3 H) 5.67 (q, J=6.90 Hz, 1 H) 6.71 (d, J=8.79 Hz, 2 H) 6.79 (d, J=2.07 Hz, 1 H) 7.17 (m, 2 H) 7.26 (dd, J=8.54, 2.07 Hz, 1 H) 7.41 (m, 3 H) 7.98 (dd, 2 H) 10.04 (s, 1 H); MS (ESI) m/z 350/352 ([M+H]+); MS (ESI) m/z 348/350 ([M−H]−).

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