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-ene reaction (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
易被酸和碱异构化的2,5-二烯六价酸酯适合[4 + 2]阴离子环化反应,以区域特异性方式生成3-(2-烯基)萘甲酸酯。当与分子内羰基-烯反应(ICE)结合使用时,萘甲酸的可及性最终达到新的蒽醌合成和非对映选择性的四氢蒽醌合成。该策略还导致了从3-甲基烯丙基萘甲酸酯的三步合成脱氢herbarin。