反应详情

温度

80 °C

Into a 1-L autoclave was introduced methanol (360 mL) in a nitrogen stream. Then, [{RuCl((R)-SEGPHOS)}2(μ-Cl)3][Me2NH2] (82 mg: 0.1 mmol) and methyl benzoylacetate (178 g: 1.0 mol) were added. After hydrogen (4.0 MPa) was forced into the autoclave, the reaction mixture was heated to 80° C. and stirred for 5.5 hours to carry out asymmetric hydrogenation reaction. After cooling, methanol was removed from the reaction mixture, and the residue was distilled under reduced pressure (94-99° C./133 Pa) to obtain 170.6 g (yield, 95.3%) of methyl (S)-3-hydroxy-3-phenylpropionate. The asymmetric yield thereof was determined with the HPLC (CHIRALCEL OD-H, 4.6 mm×250 mm; hexane/isopropyl alcohol=95/5; flow rate, 1.0 mL/min; detection wavelength, UV-254 nm), and was found to be 97.2%.

1. customhydrogenation reaction
2. temperatureAfter cooling
3. custommethanol was removed from the reaction mixture
4. distillationthe residue was distilled under reduced pressure (94-99° C./133 Pa)