Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 81, Issue 3, Pages 1116-1124Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.joc.5b02669
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Funding
- Department of Science and Technology, DST [SB/FT/CS-006/2013, INT/AUA/BMWF/P-26/2015]
- Council of Scientific and Industrial Research, CSIR [02(0219)/14/EMR-II]
- MINECO [CTQ2012-33272-BQU]
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A highly efficient synthesis of 5,6-dihydrodibenzo[b,h] [1,6]naphthyridines was achieved by reaction between 2-(N-propargylamino)benzaldehydes and arylamines in the presence of CuBr2. The in situ generated electron-deficient heterodienes bearing a tethered alkyne partner underwent an intramolecular inverse electron-demand hetero-Diels Alder reaction followed by air oxidation to furnish the products in high yields. This reaction tolerated a large number of substituents to afford diverse products under mild conditions. This strategy was also successfully extended to the synthesis of 12,13-dihydro-6-Hbenzo[h]chromeno[3,4-b][1,6]naphthyridin-6-ones starting from 3-amino-2H-chromen-2-one, again in high yields.
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