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
The octahydroisoquinoline core of morphinan was assembled starting from readily available arylcyclohexadienes. Three different approaches were developed, including a metal- and an acid-mediated Mannich type process and an anionic-mediated cyclization. All provided the desired motif as a single diastereomer having a C9−C13−C14 trans−cis relative configuration.