Cyclopenta[<i>b</i>]annulation of Heteroarenes by Organocatalytic γ′[C(sp<sup>3</sup>)−H] Functionalization of Ynones
作者:Moluguri Raghu、Jagdeep Grover、S. S. V. Ramasastry
DOI:10.1002/chem.201604562
日期:2016.12.19
to the designed ynones triggers γ′[C(sp3)−H] functionalization, leading to the formation of heteroaryl‐based ortho‐quinodimethane (oQDM) intermediates that undergo carbocyclization to provide cyclopentannulated heteroarenes in good yields and excellent stereoselectivities. Deuterium‐labeling experiments substantiated the proposed reaction mechanism as well as the speculated epimerization.
[4 + 2] Annulation of Donor–Acceptor Cyclopropanes with Acetylenes Using 1,2-Zwitterionic Reactivity
作者:Roman A. Novikov、Anna V. Tarasova、Dmitry A. Denisov、Denis D. Borisov、Victor A. Korolev、Vladimir P. Timofeev、Yury V. Tomilov
DOI:10.1021/acs.joc.7b00209
日期:2017.3.3
of donor–acceptor cyclopropanes with acetylenes under the effect of anhydrous GaCl3 using 1,2-zwitterion reactivity was elaborated. The reaction opens access to substituteddihydronaphthalenes, naphthalenes, and other fused carbocycles. The direction of the reaction can be efficiently controlled by temperature.
Robust, Enantioselective Construction of Challenging, Biologically Relevant Tertiary Ether Stereocenters
作者:Yong Guan、Tadas A. Buivydas、Remy F. Lalisse、Jonathan W. Attard、Rameez Ali、Charlotte Stern、Christopher M. Hadad、Anita E. Mattson
DOI:10.1021/acscatal.1c01095
日期:2021.5.21
A robust, catalytic enantioselective method to construct challenging, biologically relevant, tertiary ether stereocenters has been developed. The process capitalizes on readily accessible bis(oxazoline) ligands to control the facial selectivity of the addition of copper acetylides to benzopyrylium triflates, reactive species generated in situ. Up to 99%, enantiomeric excesses are achieved with a broad
Gold‐Catalyzed Intermolecular [4+2] Annulation of 2‐Ethynylanilines with Ynamides: An Access to Substituted 2‐Aminoquinolines
作者:Ximei Zhao、Xinlong Song、Hongming Jin、Zhongyi Zeng、Qian Wang、Matthias Rudolph、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1002/adsc.201800341
日期:2018.7.16
A gold‐catalyzedintermolecular [4+2] annulation of easily accessible 2‐ethynylanilines with ynamides offers a highly region‐selective, modular, efficient, and atom‐economical strategy for the synthesis of substituted2‐aminoquinolines in up to 93% yield.
Heterocyclic indole derivatives and mono- or diazaindole derivatives
申请人:Chugai Seiyaku Kabushiki Kaisha
公开号:US06673797B1
公开(公告)日:2004-01-06
There is provided a compound represented by the
general formula (1):
wherein Het represents an optionally substituted heterocyclic group; A1 and A2 each independently represent —CH═, etc.; A3 represents —CH2—, etc.; R1 represents a 4-fluorophenyl group, etc.; R2 represents an alkyl group; n represents 0, 1 or 2, provided that when A1 and A2 both are —CH═, A3 represents —CH2— or —SO2—, which is an indole derivative or a mono- or diazaindole derivative that has COX-2 inhibitory activity and is useful as a pharmaceutical, such as an anti-inflammatory agent, or addition salts thereof with a pharmaceutically acceptable acid or base, or hydrates thereof.