[CH2:1]([O:3][CH:4]([O:7][CH2:8][CH3:9])[CH2:5][NH2:6])[CH3:2].[CH:10]1([CH:16]=O)[CH2:15][CH2:14][CH2:13][CH2:12][CH2:11]1.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+].[OH-].[Na+]>CC1OCCC1>[CH:10]1([CH2:16][NH:6][CH2:5][CH:4]([O:7][CH2:8][CH3:9])[O:3][CH2:1][CH3:2])[CH2:15][CH2:14][CH2:13][CH2:12][CH2:11]1To a mixture of 2,2-diethoxyethylamine (209 mL, 1.43 mol) and MeTHF (1050 L) was added cyclohexanecarbaldehyde (107 mL, 0.89 mol). The reaction mixture was stirred for 30 min at room temperature and cooled to 0° C. Sodium triacetoxyborohydride (378 g, 1.79 mol) was added over 40 min and the reaction mixture was stirred for 2 h and cooled to 0° C. 1 M NaOH (1 L) was added. The organic layer was washed with brine in water (1:1, 2×1 L) and the volume was reduced to ˜20%. MeTHF (1 L) was added and the volume reduced to ˜20%. The solution of the crude title intermediate was used directly in the next step.
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