Regioselectivity of Birch Reductive Alkylation of Biaryls
作者:Raphaël Lebeuf、Frédéric Robert、Yannick Landais
DOI:10.1021/ol051377i
日期:2005.10.1
regioselectivity of the Birchreductive alkylation of polysubstituted biaryls has been investigated. Results indicate that regioselectivity is affected by the electronic nature of substituents on both aromatic rings. The electron-rich 3,5-dimethoxyphenyl moiety is selectively reduced and then alkylated, while phenols and aniline are not dearomatized under these conditions. Biaryls possessing a phenol moiety are
A new cascade radical reaction for the synthesis of biaryls and triaryls from benzyl iodoaryl ethers
作者:David C Harrowven、Michael I.T Nunn、Nicola A Newman、David R Fenwick
DOI:10.1016/s0040-4039(00)02111-0
日期:2001.1
The paper describes a new method of synthesizing biaryls and triaryls through an intramolecular ipso-substitution reaction initiated by the addition of an aryl radical to a benzyl ether. A tandem variant of the reaction has also been demonstrated. A short synthesis of isoaucuparin 27, a natural product found in the sapwood tissue of Sorbus aucuparia, is also described.
2-Arylphenols were conveniently synthesized from aryl iodides and 6-diazo-2-cyclohexenones, In moderate to excellent yields, via tandem Pd-catalyzed cross-coupling/aromatization. The preliminary results for the corresponding enantioselective version showed that the coupling products could be generated In up to 72% ee.