[C:1]([C:5]1[CH:6]=[C:7]([C:15](=O)[CH2:16][CH2:17][C:18](=O)[CH3:19])[CH:8]=[C:9]([C:11]([CH3:14])([CH3:13])[CH3:12])[CH:10]=1)([CH3:4])([CH3:3])[CH3:2].[CH:22]1([CH2:28][NH2:29])[CH2:27][CH2:26][CH2:25][CH2:24][CH2:23]1>C1(C)C=CC=CC=1.CC1C=CC(S(O)(=O)=O)=CC=1>[CH:22]1([CH2:28][N:29]2[C:18]([CH3:19])=[CH:17][CH:16]=[C:15]2[C:7]2[CH:6]=[C:5]([C:1]([CH3:4])([CH3:3])[CH3:2])[CH:10]=[C:9]([C:11]([CH3:14])([CH3:13])[CH3:12])[CH:8]=2)[CH2:27][CH2:26][CH2:25][CH2:24][CH2:23]1To a solution of 5a (6.4 g, 22.2 mmol) in toluene (100 mL) was added cyclohexylmethanamine (2.8 g, 24.4 mmol) and TsOH (0.3 g). This mixture was refluxed for 20 h, cooled, concentrated and purified by CC to afford compound 5b (7.5 g, 93%) as yellow oil.
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