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189
de Mayo reaction
[2 + 2] Photochemical cyclization of enones with olefins is followed by a retro-aldol reaction to give 1,5-diketones.
O
OH
CO2Me hQO
CO2Me
OH
O
O CO2Me
O
OH
hQ, [2 + 2]
cycloadditionCO2Me
O
OH CO2Me
head-to-tail alignment
retro-aldol
cyclobutane cleavage
O
O CO2Me
H O
O CO2Me
O
OH
CO2Me
Minor regioisomer:
OCO2Me
OH
hQ, [2 + 2]
cycloaddition
O
OH
CO2Me
head-to-head alignment
retro-aldol
cyclobutane cleavage
O
O
H O
OCO2Me CO2Me
O
O
CO2Me
H
190
Example 15
OPh
O
O
1. hQ, cyclohexane, 83%
2. H2 (3 atm), Pd/C (10%) HOAc, rt, 18 h, 83% O
O
Example 29O
OH
hQ, MeOH
> 90%
O
HO
O
O
H
H
H
H
References
1. de Mayo, P.; Takeshita, H.; Sattar, A. B. M. A. Proc. Chem. Soc., London 1962, 119. Paul de Mayo received his doctorate from Sir Derek Barton at Birkbeck College, Uni-versity of London. He later became a professor at the University of Western Ontario in London, Ontario, Canada, where he discovered the de Mayo reaction.
2. Corey, E. J.; Bass, J. D.; LeMahieu, R.; Mitra, R. B. J. Am. Chem. Soc. 1964, 86,5570.
3. Challand, B. D.; Hikino, H.; Kornis, G.; Lange, G.; de Mayo, P. J. Org. Chem. 1969,34, 794.
4. de Mayo, P. Acc. Chem. Res. 1971, 4, 49. (Review). 5. Oppolzer, W.; Godel, T. J. Am. Chem. Soc. 1978, 100, 2583. 6. Oppolzer, W. Pure Appl. Chem. 1981, 53, 1181. (Review). 7. Pearlman, B. A. J. Am. Chem. Soc. 1979, 101, 6398. 8. Kaczmarek, R.; Blechert, S. Tetrahedron Lett. 1986, 27, 2845. 9. Disanayaka, B. W.; Weedon, A. C. J. Org. Chem. 1987, 52, 2905. 10. Crimmins, M. T.; Reinhold, T. L. Org. React. 1993, 44, 297588. (Review). 11. Quevillon, T. M.; Weedon, A. C. Tetrahedron Lett. 1996, 37, 3939. 12. Blaauw, R. H.; Brire, J.-F.; de Jong, R.; Benningshof, J. C. J.; van Ginkel, A. E.;
Fraanje, J.; Goubitz, K.; Schenk, H.; Rutjes, F. P. J. T.; Hiemstra, H. J. Org. Chem.2001, 66, 233.
13. Minter, D. E.; Winslow, C. D. J. Org. Chem. 2004, 69, 1603. 14. Kemmler, M.; Herdtweck, E.; Bach, T. Eur. J. Org. Chem. 2004, 4582.