A new route to the synthesis of 3-methylenecoumarins-via Lewis acid catalyzed rearrangement of methyl α-aryloxymethylacrylates
作者:K. Sunitha、K.K. Balasubramanian、K. Rajagopalan
DOI:10.1016/0040-4039(84)80025-8
日期:——
Methyl-α-aryloxymethylacrylates 1a–c have been found to rearrange to furnish the methylenecoumarins 2a–c when refluxed in methylene chloride in the presence of anhydrous AlCl3.
α-Aryloxymethylacrylic acids and their derivatives have been found to undergo some novel thermal transformations leading to the formation of ‘ene’ dimers. The structure of the dimer has been revised on the basis of degradation studies, extensive spectral data and isolation of intermediates.