Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 87, Issue 19, Pages 13034-13052Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.joc.2c01563
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Funding
- SIP/IPN [20200227, 20210700, 20221003, 20220900]
- CONACYT [A1-S-17131, 282033, 300520, INFR-2014-01-226114]
- CONACYT
- Ludwig K. Hellweg Foundation
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Palladium-catalyzed functionalization was performed on two building blocks, leading to the synthesis of a variety of compounds with different functional groups. These methods have been applied in the synthesis of a new derivative of ellipticine.
Palladium-catalyzed functionalization was presently performed on two building blocks: 4-oxazolin-2-ones and 4methylene-2-oxazolidinones. Direct Heck arylation of 4-oxazolin-2ones led to a series of 5-aryl-4-oxazolin-2-ones, including analogues with N-chiral auxiliary, in an almost quantitative yield. The Pd(II)catalyzed homocoupling reaction of 4-oxazolin-2-ones provided novel heterocyclic across-ring dienes. Meanwhile, the intramolecular cross coupling of N-aryl-4-methylene-2-oxazolidinones furnished a series of oxazolo[3,4-a]indol-3-ones. Further functionalization of 4-methylene2-oxazolidinones afforded substituted indoles and heterocyclic-fused indoles with aryl, bromo, carbinol, formyl, and vinyl groups. A computational study was carried out to account for the behavior of the formylated derivatives. The currently developed methodology was applied to a new formal total synthesis of ellipticine.
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