Photolysis of 4-substituted-4-hydroxy-3-cyclobuten-1-ones: a new route to butenolides from 4-hydroxycyclobutenones
β Scribed by Steven T. Perri; Lafayette D. Foland; Harold W. Moore
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- French
- Weight
- 199 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0040-4039
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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