C(O[CH:5]([CH2:11][CH3:12])[CH:6]([N+]([O-])=O)[CH3:7])(=O)C.[N+:13]([CH2:15][C:16]([O:18][CH2:19][CH3:20])=[O:17])#[C-:14]>>[CH2:11]([C:5]1[C:6]([CH3:7])=[CH:14][NH:13][C:15]=1[C:16]([O:18][CH2:19][CH3:20])=[O:17])[CH3:12]reacting 3-acetoxy-2-nitropentane with ethyl isocyanoacetate in the presence of a nonnucleophilic base to form ethyl 3-ethyl-4-methylpyrrole-2-carboxylate;
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