[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][CH:11]([C:14]([OH:16])=O)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].C(C1NC=CN=1)(C1NC=CN=1)=O.[N:29]1[CH:34]=[CH:33][CH:32]=[CH:31][C:30]=1[C:35](=[N:37][NH2:38])[NH2:36]>ClCCl.O>[NH2:36]/[C:35](/[C:30]1[CH:31]=[CH:32][CH:33]=[CH:34][N:29]=1)=[N:37]\[NH:38][C:14]([CH:11]1[CH2:10][CH2:9][N:8]([C:6]([O:5][C:1]([CH3:2])([CH3:3])[CH3:4])=[O:7])[CH2:13][CH2:12]1)=[O:16]To as solution of 1-(tert-butoxycarbonyl)piperidine-4-carboxylic acid 37 g (167 mM) in dichloromethane (300 ml) is added carbonyl diimidazole (1 eq.) in small portion over a period of 30 min. pyridine-2-carbohydrazonamide is then added to reaction mixture and stirred at room temperature for 3 hrs. Dichloromethane is evauporated and reaction mass is then stirred in water for 30 min. solid precipitated is filtered and dried to afford the desired compound.
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