Gold-Catalyzed Cyclization of 2-Alkynylaldehyde Cyclic Acetals via Hydride Shift for the Synthesis of Indenone Derivatives
作者:Tsuyoshi Yamada、Kwihwan Park、Takumu Tachikawa、Akiko Fujii、Matthias Rudolph、A. Stephen K. Hashmi、Hironao Sajiki
DOI:10.1021/acs.orglett.0c00221
日期:2020.3.6
An efficient gold-catalyzed cyclization of 2-alkynylaldehyde cyclic acetals has been developed for the synthesis of indenone derivatives. A wide variety of functionalized indenone derivatives can be obtained in good-to-excellent yields. HMBC and NOESY NMR analyses and mechanistic elucidation experiments revealed that the cyclization occurs via a 1,5-H shift. The cyclic acetal group promoted the 1,5-H
Organocatalytic Enantio- and Diastereoselective Synthesis of 1,2-Dihydronaphthalenes from Isobenzopyrylium Ions
作者:Hui Qian、Wanxiang Zhao、Zhaobin Wang、Jianwei Sun
DOI:10.1021/ja509824j
日期:2015.1.21
efficient asymmetricsynthesis of dihydronaphthalenes is disclosed. The process represents a new addition to the limited asymmetricreactions of isobenzopyryliums, a family of versatile 10π-electron aromatic species. Excellent asymmetric induction is achieved for the first time without an anchoring group in the 4-position or a metal catalyst, both of which were required previously in these reactions. The