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N-(1-Carboethoxy-benzimidazol-2-yl) 1 reacted with different hydrazines to give [1,3,5]triazino[1,2a]benzimidazole derivatives 2. Treatment of compound 1 with tBuOK and EtONa yielded pyrimidino[1,2a]benzimidazole derivatives 3 in good yields.
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