C([O:3][C:4]([CH:6]1[CH2:23][CH2:22][C:9]2([O:13][N:12]=[C:11]([C:14]3[CH:19]=[CH:18][CH:17]=[C:16]([O:20][CH3:21])[CH:15]=3)[CH2:10]2)[CH2:8][CH2:7]1)=[O:5])C.O.[OH-].[Li+]>CO.O>[CH3:21][O:20][C:16]1[CH:15]=[C:14]([C:11]2[CH2:10][C:9]3([CH2:22][CH2:23][CH:6]([C:4]([OH:5])=[O:3])[CH2:7][CH2:8]3)[O:13][N:12]=2)[CH:19]=[CH:18][CH:17]=1A mixture of 3-(3-methoxyphenyl)-1-oxa-2-azaspiro[4.5]dec-2-ene-8-carboxylic acid ethyl ester (51 g, 161 mmol) in MeOH (1000 ml) and lithium hydroxide monohydrate (18 g, 241 mmol) in H2O (145 ml) was stirred overnight at RT.
Wird geladen…