[H-].[H-].[H-].[H-].[Li+].[Al+3].O[C@@H]1C[C@H](CN(C)C(=O)OC(C)(C)C)C1.[CH2:22]([NH:29][C:30]([CH:32]1[CH2:35][C:34](=[O:36])[CH2:33]1)=O)[C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1.[OH-].[Na+]>C1COCC1.O>[CH2:22]([NH:29][CH2:30][C@@H:32]1[CH2:35][C@H:34]([OH:36])[CH2:33]1)[C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1LiAlH4 (2.7 g, 0.07 mol) was added to a solution of intermediate 7, N-Benzyl-3-oxocyclobutanecarboxamide (7.12 g, 0.035 mol) in absolute THF (100 mL) under stirring in argon. The mixture was refluxed under stirring for 2 h and cooled. Then 10 N NaOH (2 mL) and water (1 mL) were added. The organic layer was decanted, and the aqueous one was extracted with THF (2×50 mL). The organic layers were evaporated to afford the title compound (3.9 g, 58%) as a colorless oil. 1H NMR-data (DMSO-d6): 7.00-7.49 (m, 6H, NH, Ph); 4.80 (br.s, 1H, OH); 3.81-3.95 (m, 1H); 3.67 (s, 2H, CH2); 2.48 (d, 2H, CH2, J=6.8 Hz); 2.19-2.30 (m, 2H); 1.70-1.84 (m, 1H); 1.35-1.50 (m, 2H).
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