Asymmetric dearomative spirolactonization of naphthols using λ3-iodanes under chiral phase-transfer catalysis
作者:Kevin Antien、Guillaume Viault、Laurent Pouységu、Philippe A. Peixoto、Stéphane Quideau
DOI:10.1016/j.tet.2017.04.028
日期:2017.6
The asymmetric phase-transfer catalytic effect of chiral Cinchona alkaloid-derived quaternary ammonium salts was investigated in the context of the λ3-iodane-mediated dearomative spirolactonization of naphthols. The scope and limitations of this methodology were evaluated using various substrates, which were converted into spirolactones in good yields and with enantiomeric excesses up to 58%.
6H-Dibenzo[b,d]pyran-6-one, 6H-benzo[d]naphtho[1,2-b]pyran-6-one, and their derivatives were prepared via the palladium mediated aryl-aryl couplingreaction of aryl ortho-halobenzoate. The short step synthesis of arnottin I(1) was achieved by this method.
A Concise Synthesis of Arnottin I via Internal Biaryl Coupling Reaction Using Palladium Reagent
作者:Takashi Harayama、Hirotake Yasuda
DOI:10.3987/com-97-s23
日期:——
Total synthesis of arnottin I (1) was accomplished via the internal aryl-aryl coupling reaction of iodo-ester (2) by the palladium-assisted cyclization reaction.