C[O:2][C:3]([C@H:5]1[CH2:10][CH2:9][C@H:8]([O:11][C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=2)[CH2:7][CH2:6]1)=O.O.[NH2:19][NH2:20]>>[O:11]([C@H:8]1[CH2:9][CH2:10][C@H:5]([C:3]([NH:19][NH2:20])=[O:2])[CH2:6][CH2:7]1)[C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1A mixture of trans-4-phenoxy-cyclohexanecarboxylic acid methyl ester (1.07 g, 4.57 mmol) and hydrazine hydrate (0.22 g, 4.48 mmol) was heated at 120° C. for 4 h. After cooling to room temperature the reaction mixture was concentrated in vacuo to give the crude title compound as white solid in quantitative yield, which was used in the next step without further purification.
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