[H-].[H-].[H-].[H-].[Li+].[Al+3].[C:7]1([CH:13]2[NH:19][CH2:18][CH2:17][NH:16][C:15](=O)[CH2:14]2)[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1.[OH-].[Na+]>C1COCC1.O>[C:7]1([CH:13]2[NH:19][CH2:18][CH2:17][NH:16][CH2:15][CH2:14]2)[CH:8]=[CH:9][CH:10]=[CH:11][CH:12]=12.0 g LiAlH4 were suspended in THF under a nitrogen atmosphere, and then 5.0 g hexahydro-7-phenyl-1,4-diazepin-5-one were added thereto at 10° C. Then the mixture was stirred for 8 hours at room temperature. Under a nitrogen atmosphere, 5 ml water, 2.2 g NaOH, dissolved in 5 ml water, and again 3 ml water were then added dropwise in succession, and the mixture was stirred for 15 minutes at room temperature. Once the resulting salts had been filtered out, the filtrate was reduced to dryness under vacuum. 4.9 g of 7-phenyl-1,4-diazepane were obtained, which was reacted without further purification.
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