Journal
ORGANIC LETTERS
Volume 23, Issue 22, Pages 8937-8941Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.1c03418
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Funding
- National Natural Science Foundation of China [81773889, 22001024, 82073998]
- Sichuan Science and Technology Program [2021YJ0402, 2021YFS0044]
- Xinglin Scholar Research Promotion Project of Chengdu University of TCM
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An efficient (3 + 1 + 1) carboannulation strategy was developed for constructing diversely functionalized Spiro-cyclopentadiene oxindoles using Morita-Baylis-Hillman carbonates and pyridinium ylides. The reaction features broad substrate scope and high chemo- and regioselectivity, with the potential to easily transform the products into interesting Spiro-cyclopenta[c] furan oxindoles.
An efficient formal (3 + 1 + 1) carboannulation strategy of Morita-Baylis-Hillman (MBH) carbonates with pyridinium ylides was developed for constructing diversely functionalized Spiro-cyclopentadiene oxindoles. The reaction initiates with an S(N)2' olefination of MBH carbonates with pyridinium ylides. The in situ generated dienes then engage in a challenging (4 + 1) ylide carboannulation, which has been rarely reported before. The reaction features broad substrate scope as well as high chemo- and regioselectivity. (3 + 1 + 1) carboannulation products could be easily transformed into interesting Spiro-cyclopenta[c] furan oxindoles.
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