[CH3:1][C:2]1([CH3:17])[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[C:5]([C:12]([O:14]CC)=[O:13])=[CH:4][CH2:3]1.C[Si](C)(C)[O-].[K+]>C1COCC1>[CH3:1][C:2]1([CH3:17])[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[C:5]([C:12]([OH:14])=[O:13])=[CH:4][CH2:3]1A solution of the compound from Example 41 (15.5 g, 71.7 mmol) and potassium trimethylsilanolate (17.4 g) in 100 ml of THF was refluxed for 24 hours. After workup the title compound (8.7 g, 52%) was obtained as a white solid.
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