Journal
ORGANIC CHEMISTRY FRONTIERS
Volume 7, Issue 3, Pages 499-506Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9qo01039d
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Funding
- National NSFC [21572223, 21572224, 21602217, 21871252]
- National Key R&D Program of China [2018YFC0807301]
- Project of Youth Science and Technology Innovation Team of Sichuan Province [2016TD0027]
- Sichuan Youth Science and Technology Foundation [2016JQ0024]
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Coumarin-3-thioformates acting as a new type of 3-carbon partner were firstly prepared and engaged in reacting with 3-hydroxyoxindoles and 3-aminooxindoles by using DABCO or Et3N as the catalyst. A wide scope of structurally diverse spiro-fused pentaheterocyclic compounds including spiro-butyrolactoneoxindole[3,4-c]coumarins and spiro-butyrolactamoxindole[3,4-c]coumarins, which combined oxindole, dihydrofuranone or pyrrolidone, and coumarin in one molecule, could be smoothly obtained in high yields via a tandem Michael addition-lactonization/lactamization process under mild conditions.
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