Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 80, Issue 11, Pages 5556-5565Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.joc.5b00434
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- Japan Society for the Promotion of Science (JSPS)
- Takeda Science Foundation
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o- and/or p-naphthocininone methides (NQMs) can be selectively prepared by the ring opening of 1-(siloxymethyl)-1,4-epoxy-1,4-dihydronaphthalerie derivatives based on a substituent effect at the 4 position of the substrates. The 4-alkyl- or silylsubstituted 1-(siloxymethyl)-1,4-epoxy-1,4-dihydronaphthalene was transformed to o-NQM (1-naphthoquinone-2-methide), which underwent Friedel-Crafts 1,4-addition of the alpha,beta-unsaturated carbonyl moiety to provide the 2,benzyl-1-naphthol as the biarylmethane and [4 + 2]-cydoaddition with a dienophile to give the fused heterocyclic arene. Meanwhile, the 4-unsubstituted 1-(siloxymethyl)-1,4-epoxy-1,4-dihydronaphthalene could be converted to the corresponding 4-benzyl-1-naphthol by the Friedel Crafts 1,6-addition of p-NQM (1-naphthoquinone-4-methide) generated by the site-selective ring opening of the 1,4-epoxy moiety. Furthermore, the 4-(siloxymethyl)-(1,4-bis(slloXymethyl))-1,4-epoxy-1,4-dihydronaphthalene was transformed into a 2,4-bisbenzyl-1-naphthol or pentacyclic derivative via both the o- and p-NQM intermediates.
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