for the construction of n-membered (n>3) N-heterocycles, rely upon two chemical operations by involving sequential nucleophilic and electrophilic C-N bond formations. Here, we report a highly efficient cascade of alkyne insertion/C-H activation/amination for the rapid preparation of a myriad of tricyclic indoles, in a single-step transformation, by using bifunctional secondary hydroxylamines. Noteworthy
Chiral Magnesium Bisphosphate-Catalyzed Asymmetric Double C(sp<sup>3</sup>)–H Bond Functionalization Based on Sequential Hydride Shift/Cyclization Process
functionalization triggered by a sequential hydrideshift/cyclization process. This reaction consists of stereoselective domino C(sp3)-H bond functionalization: (1) a highly enantio- and diastereoselective C(sp3)-H bond functionalization by chiral magnesium bisphosphate (first [1,5]-hydride shift), and (2) a highly diastereoselective C(sp3)-H bond functionalization by an achiral catalyst (Yb(OTf)3, second [1
Divergent Access to Seven/Five-Membered Rings Based on [1,6]-Hydride Shift/Cyclization Process
作者:Daiki Hoshino、Keiji Mori
DOI:10.1021/acs.orglett.1c03523
日期:2021.12.17
We have achieved a divergent access to seven/five-memberedrings based on a [1,6]-hydride shift/cyclization process from benzylidenemalonate with an o-alkoxymethyl group. Whereas Yb(OTf)3 afforded benzoxepines (with a seven-membered ring) selectively, indanes (with a five-memberedring) were the main products when Sc(OTf)3 was employed.
Expeditious synthesis of 1-aminoindane derivatives achieved by [1,4]-hydride shift mediated C(sp3)–H bond functionalization
作者:Keiji Mori、Kazuki Kurihara、Takahiko Akiyama
DOI:10.1039/c4cc00894d
日期:——
Described herein is a [1,4]-hydride shift mediated expeditious synthesis of 1-aminoindane derivatives. A wide variety of substrates could be employed in this reaction to afford various indane derivatives in good to excellent chemical yields. Examination of the amine moiety revealed that the sterically hindered amine is the key to achieving both low catalyst loading and excellent chemical yields.
Rapid access to 3-indolyl-1-trifluoromethyl-isobenzofurans by hybrid use of Lewis/Brønsted acid catalysts
作者:Daiki Hoshino、Keiji Mori
DOI:10.1039/d0ob01582b
日期:——
ofurans via a [1,4]-hydride shift/cyclizatin/intermolecular nucleophilic addition reaction sequence. In this process, a Lewisacidpromoted internal redox reaction ([1,4]-hydride shift/cyclization) followed by a Brønsted acidpromoted intermolecular reaction (generation of cyclic oxonium cation/intermolecular Friedel–Crafts reaction) occurred to give various 3-indolyl-1-trifluoromethyl-isobenzofurans