[CH:1]([CH:3]=[CH2:4])=[O:2].[O:5]=[C:6]1[CH2:10][CH2:9][CH2:8][CH:7]1[C:11]([O:13][C:14]([CH3:17])([CH3:16])[CH3:15])=[O:12]>ClCCl>[O:5]=[C:6]1[CH2:10][CH2:9][CH2:8][C@@:7]1([CH2:4][CH2:3][CH:1]=[O:2])[C:11]([O:13][C:14]([CH3:17])([CH3:16])[CH3:15])=[O:12]A solution of acrolein (4.19 g; 74.83 mmoles—2.5 eq.) in 10 mL of anhydrous dichloromethane is poured, over 30 minutes, at −25° C., under argon and with slow stirring, into a solution of tert-butyl 2-oxo-cyclopentanecarboxylate (5.51 g; 29.93 mmoles) and catalyst Q (1.46 g; 2.99 mmoles—0.1 eq.) in 60 mL of anhydrous dichloromethane
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