[NH:1]1[CH2:6][CH2:5][CH2:4][NH:3][C:2]1=[O:7].C[Si](C)(C)Cl.C(N(CC)CC)C.[O:20]1CCOC[CH2:21]1>>[CH:21]([N:1]1[CH2:6][CH2:5][CH2:4][NH:3][C:2]1=[O:7])=[O:20]The mixture of 10 parts by weight of 1,3-diaza-cyclohexane-2-one, 49 parts by weight of trimethylchlorosilane, 25 parts by weight of triethylamine and 150 parts by volume of dioxane were boiled for 3 days with stirring and exclusion of moisture, then filtered, evaporated to 50 parts by volume in vacuo and stirred overnight with 11.5 parts by volume of formic acid-acetic acid anhydride. The mixture was evaporated to dryness in vacuo, and the residue was recrystallized from ethanol/ether.
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