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J Org Chem
; 80(19): 9682-90, 2015 Oct 02.
Article
in English
| MEDLINE
| ID: mdl-26348393
ABSTRACT
Diels-Alder cycloadditions of 3-oxobut-1-enyl substituted orthoquinone monoketals with olefinic dienophiles furnished functionalized ortho-endo bicyclo[2.2.2]octenone derivatives with high regio- and stereoselectivities. The competition between self-dimerization and Diels-Alder cycloaddition with an external dienophile usually exists, except in the case of 5-substituted orthoquinone monoketal.