... [1] James M. Hamby and Ludwig Bauer* Department of Medicinal Chemistry and Pharmacognosy ... Heterocyclic Chem., 24, 1013 (1987). ... N C02CHj Г I J*^N N-СОзСНз N CH3 To test if any reaction could take place via nucleophilic attack at the C-2 carbonyl group, lb was treated ...