Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 87, Issue 21, Pages 13556-13563Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.joc.2c01063
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Funding
- DST-Science & Engineering Research Board (SERB)
- UGC
- [EEQ/2021/000374]
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This article describes an efficient, straightforward, and one-pot synthesis method for biologically active spiro-dihydropyridine oxindoles. The method has great flexibility and yields good results, and the resulting products can be further modified into new compounds of pharmaceutical relevance.
An efficient, straightforward, and one-pot synthesis of biologically relevant spiro-dihydropyridine oxindoles was described via readily available isatin, malononitrile, allenoate, and amines. The metal/organocatalyst-free, Et3N-mediated reaction proceeds via cascade spiro-cyclization of in situ generated Knoevenagel/aza-Michael adducts. The reaction has great flexibility over electron-rich and electron-poor substituents affording desired products in good to excellent yields. We have also demonstrated the selected spiro-dihydropyridines for late-stage diversification into new spiro-dihydropyridine hybrids of pharmaceutical relevance.
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