Organocatalyzed benzannulation for the construction of diverse anthraquinones and tetracenediones
作者:Krishna Bahadur Somai Magar、Likai Xia、Yong Rok Lee
DOI:10.1039/c5cc00623f
日期:——
An efficient one-pot synthesis of anthraquinones and tetracenediones was achieved by l-proline catalyzed benzannulation of commercially available 1,4-naphthoquinones or 1,4-anthracenedione with a variety of α,β-unsaturated aldehydes in good to excellent yield.
Studies of Diastereoselectivity in Diels−Alder Reactions of Enantiopure (S<i>S</i>)-2-(<i>p</i>-Tolylsulfinyl)-1,4-naphthoquinone and Chiral Racemic Acyclic Dienes
作者:M. Carmen Carreño、Susana García-Cerrada、Antonio Urbano、Claudio Di Vitta
DOI:10.1021/jo000210u
日期:2000.7.1
Enantiopure sulfinylnaphthoquinone (+)-5 reacted with racemic acyclic dienes 1a-f bearing a stereogenic allylic center, through a tandem cycloaddition/pyrolytic sulfoxide elimination, to afford optically enriched compounds 8a-f and 9a-f with good like/unlike selectivities (ca. 75:25) and good enantiomeric excesses (68-82%), arising from the partial kinetic resolution of the racemic dienes. The opposite
Applications of [4+2] Anionic Annulation and Carbonyl-Ene Reaction in the Synthesis of Anthraquinones, Tetrahydroanthraquinones, and Pyranonaphthoquinones
作者:Shyam Basak、Dipakranjan Mal
DOI:10.1021/acs.joc.7b01987
日期:2017.10.20
5-dienoates, susceptible to isomerization by acids and bases, are suitable for the [4+2] anionic annulation to give 3-(2-alkenyl)naphthoates in regiospecific manner. When combined with intramolecular carbonyl-enereaction (ICE), the accessibility of the naphthoates culminates in a new synthesis of anthraquinones and diastereoselective synthesis of tetrahydroanthraquinones. This strategy has also resulted in a