[CH:1]12[CH2:9][CH2:8][CH:4]([NH:5][C:6]1=[O:7])[C:3](=[O:10])[NH:2]2.[H-].[Na+].[CH2:13](Cl)[C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1.O>CN(C)C=O.C(OCC)C>[CH2:13]([N:2]1[C:3](=[O:10])[CH:4]2[CH2:8][CH2:9][CH:1]1[C:6](=[O:7])[N:5]2[CH2:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1)[C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1
A hot solution of 36.6 g (0.262 mole) of 2,5-diazabicyclo[2.2.2]octane-3,6-dione in 800 ml dry dimethylformamide was added rapidly from a dropping funnel to 12.5 g (0.52 mole) of oil-free sodium hydride. After stirring for 1 hour, the mixture was chilled and treated with 67.5 ml (0.59 mole) benzyl chloride during a period of a few minutes. After stirring at room temperature for 18 hours, 1 liter of water was added cautiously, and the mixture was extracted with chloroform. The extracts were washed with water, dried with sodium sulfate, and evaporated to dryness to yield a crystalline residue. Trituration in diethyl ether provided 77.0 g (91%) of product as colorless needles, melting point 168°-170° C.
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