Synthesis of Benzo[<i>c</i>]xanthones from 2-Benzylidene-1-tetralones by the Ultraviolet Radiation-Mediated Tandem Reaction
作者:Wen-Zhi Xu、Zhi-Tang Huang、Qi-Yu Zheng
DOI:10.1021/jo8008929
日期:2008.7.1
A facile one-pot method to prepare benzo[c]xanthones from readily accessible benzylidene-1-tetralones by the ultraviolet radiation-mediated tandemreaction is reported. The overall transformation presumably involves cis−trans isomerization, oxa-6π electrocyclization, singlet oxygen ene reaction, dehydration, and aromatization.
报道了一种容易的一锅法,该方法通过紫外线介导的串联反应从容易获得的亚苄基-1-四氢萘酮制备苯并[ c ]氧杂蒽。整个转化可能涉及顺反异构化,oxa-6π电环化,单线态氧烯反应,脱水和芳构化。
Deconstructive annulation mediated one-pot synthesis of xanthene derivatives
deconstructive annulation methodology. Sequential oxidative C(sp3)–O/C(sp3)–N cleavage followed by intramolecular/intermolecular annulationreaction was carried out under aerobic reaction conditions. Mechanistic analyses performed on the substrate revealed that the C(sp3)–O bond cleavage supersedes the C(sp3)–N bond scission. The in situ generated Betti base intermediate through the C(sp3)–O cleavage