[CH2:1]([O:8][N:9]=[CH:10][C:11]1([C:19]([OH:21])=[O:20])[CH2:14][CH:13]([CH2:15][CH2:16][CH2:17][CH3:18])[CH2:12]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.CN(C1C=CC(N=NC2C=CC(S(O)(=O)=O)=CC=2)=CC=1)C.Cl.C([BH3-])#N.[Na+]>CO>[CH2:1]([O:8][NH:9][CH2:10][C:11]1([C:19]([OH:21])=[O:20])[CH2:14][CH:13]([CH2:15][CH2:16][CH2:17][CH3:18])[CH2:12]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1
A solution of 1-(benzyloxyimino-methyl)-3-butyl-cyclobutanecarboxylic acid (5.62 g, 19.4 mmol) in methanol (200 mL) at 0° C. under a nitrogen atmosphere was added a trace amount of methyl orange. A solution of saturated methanolic HCl was added until a persistent red color was observed. Sodium cyanoborohydride (1.59 g, 25.3 mmol) was added portionwise alternately with methanolic HCl to maintain the red color. The reaction mixture was maintained at 0° C. for an additional 0.5 h and the volatiles were removed in vacuo. The product was used without further purification. MH+292.
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