摘要:
A synthetic route for obtaining 2-heteroaryl-substituted zwitterionic malonaldehydes 1c-6c is described. The synthesis involves the two-fold formylation of heteroarylacetic acids 1a-6a using the Vilsmeier-Haack reagent, followed by hydrolysis of the intermediate trimethinium salts 1b-6b with aqueous sodium carbonate. Elemental analysis, IR, H-1 NMR, C-13 NMR, and mass spectral data confirm the structures of the newly synthesized compounds. (C) 2012 Elsevier Ltd. All rights reserved.