期刊
MONATSHEFTE FUR CHEMIE
卷 139, 期 2, 页码 141-145出版社
SPRINGER WIEN
DOI: 10.1007/s00706-007-0765-4
关键词
4-nitrophthalic acid; imino Diels-Alder reactions; 3,4-dihydro-2H-pyran; 2,3-dihydrofuran; tetrahydroquinolines
4-Nitrophthalic acid was found to be an effective catalyst for the imino Diels-Alder reaction of N-benzylideneanilines with 3,4-dihydro-2H-pyran and 2,3-dihydrofuran to afford pyrano- and furanoquinolines in good yields. It was also found that aryl amines react smoothly with 3,4-dihydro-2H-pyran and 2,3-dihydrofuran under the same condition to afford the corresponding pyrano- and furanoquinolines in high yields. This catalyst is inexpensive, easily available, water soluble, and stable to aqueous reaction conditions.
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