[CH2:1]([O:8][C:9]1[CH:14]=[CH:13][C:12]([CH2:15][CH2:16][CH:17]=[CH:18][C:19](=[O:21])[CH3:20])=[CH:11][CH:10]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.Br[CH2:23][C:24]([O:26][CH2:27][CH3:28])=[O:25]>[Zn]>[OH:21][C:19]([CH3:20])([CH:18]=[CH:17][CH2:16][CH2:15][C:12]1[CH:13]=[CH:14][C:9]([O:8][CH2:1][C:2]2[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=2)=[CH:10][CH:11]=1)[CH2:23][C:24]([O:26][CH2:27][CH3:28])=[O:25]Using 25.83 g of 6-(p-benzyloxyphenyl)-3-hexen-2-one, 11.3 ml of ethyl bromoacetate and 6.63 g of zinc, the reaction and the purification of the product were carried out according to the method described in Example I (a) affording 29.6 g of ethyl 3-hydroxy-3-methyl-7-(p-benzyloxyphenyl)-4-heptenoate.
Wird geladen…