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[4 + 2]Cycloaddition of indole derivatives with bismaleimides: a route to new biscarbazoles

โœ Scribed by Pindur, Ulf; Gonzalez, Eugenia; Mehrabani, Farokh


Book ID
115542258
Publisher
Royal Society of Chemistry
Year
1997
Weight
474 KB
Volume
12
Category
Article
ISSN
1472-7781

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Cycloadditions of substituted benzopyran
โœ Peter J. Cremins; Suthiweth T. Saengchantara; Timothy W. Wallace ๐Ÿ“‚ Article ๐Ÿ“… 1987 ๐Ÿ› Elsevier Science ๐ŸŒ French โš– 692 KB

The benxopyranones 1 and 3 reacted with 2.3-dimethyl-1,3-butadiene in the presence of titanium (IV) chloride to give the corresponding (4 + 2) cycloadducts 8 and 11, the former undergoing facile deformylation to give 9 and 10. Compounds 1.3. and 4 underwent efficient uncatalysed cycloaddition to lme