Synthesis of 2-ethoxyprop-2-enal dimethylhydrazone and its Diels-Alder reactions
摘要:
Conditions were found for the preparation of 2-ethoxyprop-2-enal dimethylhydrazone by reaction of 2-ethoxypropenal with N,N-dimethylhydrazine. 2-Ethoxyprop-2-enal dimethylhydrazone reacted with methyl vinyl ketone and methyl acrylate according to the [4+2]-cycloaddition pattern with regioselective formation of substituted tetrahydropyridines. The major product in the reaction of 2-ethoxyprop-2-enal dimethylhydrazone with 1,4-benzoquinone was 5-hydroxy-1-benzofuran-2-carbaldehyde dimethylhydrazone formed as a result of [3+2]-cycloaddition; a small amount of the corresponding [4+2]-cycloaddition product was also obtained. Some spontaneous transformations of the primary cycloaddition products were revealed.
Synthesis of 2-ethoxyprop-2-enal dimethylhydrazone and its Diels-Alder reactions
摘要:
Conditions were found for the preparation of 2-ethoxyprop-2-enal dimethylhydrazone by reaction of 2-ethoxypropenal with N,N-dimethylhydrazine. 2-Ethoxyprop-2-enal dimethylhydrazone reacted with methyl vinyl ketone and methyl acrylate according to the [4+2]-cycloaddition pattern with regioselective formation of substituted tetrahydropyridines. The major product in the reaction of 2-ethoxyprop-2-enal dimethylhydrazone with 1,4-benzoquinone was 5-hydroxy-1-benzofuran-2-carbaldehyde dimethylhydrazone formed as a result of [3+2]-cycloaddition; a small amount of the corresponding [4+2]-cycloaddition product was also obtained. Some spontaneous transformations of the primary cycloaddition products were revealed.