反应详情

Racemic 19 (86 mg, 0.62 mmol) was dissolved in THF (5 mL), vinyl acetate (0.5 mL) was added. Amano lipase PS-30 (60 mg) was added and the resulting suspension was stirred at 23° C. until 50% conv. was reached (NMR) in ca. 6 h. The resulting suspension was diluted with Et2O and filtered on celite, the filter cake rinsed with Et2O. After evaporation of the remaining solvent, the residue was purified by column chromatography using hexanes/EtOAc (8:1, 6:1 then 4:1) to yield acetate 21 and the desired enantioenriched (−)-indanol (−)-19 (38.5 mg, 45% yield). [α]D20-28.3° (c 1.02, CHCl3), ([α]D20 lit. −27.2° (c 1.0, CHCl3).38 The enantiomeric excess of the 2,4-dinitrobenzoate derivative was determined to be 89.9% ee by chiral HPLC, Column ChiralPak IA, hexane/isopropanol (100/0 to 90/10, 15 min; 90/10 to 80/20, 15 min), 1 mL/min, Rt minor=16.58 min, Rt Major=19.5 min.