Photochemistry of 4H,7H-benzo[1,2-c:4,3-c′]dipyran-4,7-dione, a twofold isocoumarin

Organic Letters

Volumn 2, Issue 26, 2000, Pages 4253-4255

  Kinder, Michael A ^a   Margaretha, Paul ^a  

^a UNIVERSITY OF HAMBURG   (Germany)

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Indexed keywords

EID: 0003169473     PISSN: 15237060     EISSN: None     Source Type: Journal    
DOI: 10.1021/ol006820y     Document Type: Article

References (14)

1. Nishimura, J.; Nakamura, Y.; Hayashida, Y.; Kudo, T. Acc. Chem. Res. 2000, 33, 679.
2. Nakamura, Y.; Hayashida, Y.; Wada, Y.; Nishimura, J. Tetrahedron 1997, 53, 4593.
3. Corey, E. J.; Gras, J. L.; Ulrich, O. Tetrahedron Lett. 1976, 17, 809.
4. Burns, J. A.; Whitesides, G. M. J. Am. Chem. Soc. 1990, 112, 6296.
5. Mohler, D. L.; Thompson, D. W. Tetrahedron Lett. 1987, 28, 2567.
6. Bonadies, F.; Di Fabio, R. J. Org. Chem. 1984, 49, 1647.
7. max 373 nm (log ∈ = 3.80), 270 nm (log ∈ = 4.40). Compounds 1, 4, and 5 gave satisfactory elemental analyses.
8. Kinder, M. A.; Kopf, J.; Margaretha, P. Tetrahedron 2000, 56, 6763.
9. +, 2%], 214 (100%). An analytically pure sample is obtained by recrystallization from acetonitrile.
10. Bethke, J.; Kopf, J.; Margaretha, P.; Pignon, B.; Dupont, L.; Christiaens, L. E. Helv. Chim. Acta 1997, 80, 1865.
11. XX′ = 1.6 Hz, 8H), 8.05 (s, 4H).
12. 3CN) δ 47.3, 81.5, 90.1, 92.3, 104.2, 129.5, 131.4, 132.3, 133.4, 136.9, 148.3, 161.7, 164.9. An analytically pure sample is obtained by recrystallization from acetonitrile.
13. 6) δ 5.63 (d, J = 7.1 Hz, 2H), 5.69 (d, J = 7.1 Hz, 2H), 8.40 (s, 2H).
14. Murov, S. L. Handbook of Photochemistry; M. Dekker: New York, 1973; p 4.