been developed for the synthesis of aromatic and heteroaromatic compounds through tandem allylic substitution/hydroarylative cycloisomerization process. This method provides a facile and general route to substituted benzenes, naphthalenes, other polycyclic aromatics, and various benzene-fused heteroaromatic compounds such as benzofuran, benzothiophene, indole, and carbazoles.
The Baylis–Hillman acetates in organic synthesis: Unprecedented sodium nitrite induced intramolecular Friedel–Crafts cyclization of secondary nitro compounds
作者:Deevi Basavaiah、Daggula Mallikarjuna Reddy
DOI:10.1039/c4ra03573a
日期:——
Unprecedented sodium nitrite mediated intramolecularFriedel–Craftscyclization of alkyl (E)-2-arylidene-4-nitroalkanoates and (E)-3-arylidene-5-nitroalkan-2-ones derived from Baylis–Hillman acetates, providing a facile protocol for synthesis of naphthalenes, phenanthrenes, and carbazoles has been described.
A novel tandem Pd-catalyzed intramolecular allylic decarboxylative coupling and “diradical conjugated 1,3-dien-5-yne cycloaromatization”: An unusual ortho -selectivity in the cycloaromatization and the mechanistic implications
hindered cyclization products (12–23) via the unusual ortho-selective cycloaromatization; while the meta-alkoxy (1i–m, 1r–t) group provided predominantly the ortho-selective 1,3-dien-5-yne cycloaromatization products, meta-Me group (1 n–q), products formed both via ortho-selective cyclization and para-selective cyclization products in comparable ratio. A novel mechanism involving diradical species