[N+](=[CH2:3])=[N-].[OH:4][CH:5]([CH2:22][CH2:23][CH2:24][CH2:25][CH3:26])[CH2:6][CH2:7][CH2:8][N:9]([CH2:13][CH2:14][CH2:15][CH2:16][CH2:17][CH2:18][C:19]([OH:21])=[O:20])[C:10]([NH2:12])=[S:11].C(O)(=O)C>CCOCC>[OH:4][CH:5]([CH2:22][CH2:23][CH2:24][CH2:25][CH3:26])[CH2:6][CH2:7][CH2:8][N:9]([CH2:13][CH2:14][CH2:15][CH2:16][CH2:17][CH2:18][C:19]([O:21][CH3:3])=[O:20])[C:10]([NH2:12])=[S:11]A solution of diazomethane (approx. 2.5 g., 0.06 mole) in ether (100 ml.) is mixed with a solution of 7-[1-(4-hydroxynonyl)thioureido]heptanoic acid (10.3 g., 0.03 mole) (Example 3) in ether (50 ml.). The resulting solution is allowed to stand at room temperature for 4 hours. Then acetic acid is added to destroy the excess diazomethane and the solution is washed with dilute sodium bicarbonate solution, brine, then dried over sodium sulfate. Evaporation of volatile materials at reduced pressure yields methyl 7-[1-(4-hydroxynonyl)thioureido]heptanoate as a viscous oil.
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