Cyclohexanones 2b and 2c represent the first examples of nonenolizing 2-acylcyclohex-2-enones. as they bear H-atoms neither at C(4) or C(6) of the enone ring. nor at the C-atom vicinal to the exocyclic carbonyl group. While the CF3CO group in 2b (and the Ac group in 2a) are coplanar to the enone double bonds, the pivaloyl group in 2c, for steric reasons, is out of plane. Compounds 2 exhibit a pronounced sluggishness in both thermal and light-induced bimolecular reactions.
Cyclohexanones 2b and 2c represent the first examples of nonenolizing 2-acylcyclohex-2-enones. as they bear H-atoms neither at C(4) or C(6) of the enone ring. nor at the C-atom vicinal to the exocyclic carbonyl group. While the CF3CO group in 2b (and the Ac group in 2a) are coplanar to the enone double bonds, the pivaloyl group in 2c, for steric reasons, is out of plane. Compounds 2 exhibit a pronounced sluggishness in both thermal and light-induced bimolecular reactions.
Photocycloaddition reactions of 2-acylcyclohex-2-enones
作者:Leticia Oliveira Ferrer、Paul Margaretha
DOI:10.1039/b009692j
日期:——
The newly synthesized 2-acylcyclohex-2-enones 1 photocycloadd
selectively to the C–C triple bond of 2-methylbut-1-en-3-yne giving
diacylcyclobutene derivatives 4 and 5, and they react with
2,3-dimethylbut-2-ene in an overall [4+2]-photocycloaddition to afford
benzopyranones 7.