Chromium-Catalyzed Regioselective Kumada Arylative Cross-Coupling of C(aryl)–O Bonds with a Traceless Activation Strategy
摘要:
We report here the chromium-catalyzed regioselective Kumada arylative cross-coupling of C(aryl)-O bonds at ambient temperature. By using a simple and low-cost chromium(II) chloride salt as a precatalyst, accompanied by a 2-pyridyl ligation, the catalytic cleavage and arylative coupling of C(aryl)-O bonds were achieved with a traceless activation strategy, overcoming the regioselectivity obstacle when several C-O bonds coexist in the Kumada coupling system.
Enantioselective Synthesis of Axially Chiral Biaryls by Diels–Alder/Retro-Diels–Alder Reaction of 2-Pyrones with Alkynes
作者:Meng-Meng Xu、Xin-Yu You、Yu-Zhen Zhang、Yang Lu、Kui Tan、Limin Yang、Quan Cai
DOI:10.1021/jacs.1c04759
日期:2021.6.23
The enantioselective synthesis of axiallychiralbiaryls by a copper-catalyzed Diels–Alder/retro-Diels–Alder reaction of 2-pyrones with alkynes is reported herein. Using electron-deficient 2-pyrones and electron-rich 1-naphthyl acetylenes as the reaction partners, a broad range of axiallychiralbiaryl esters are obtained in excellent yields (up to 97% yield) and enantioselectivities (up to >99% ee)
Nickel-Catalyzed Heteroarenes Cross Coupling via Tandem C–H/C–O Activation
作者:Ting-Hsuan Wang、Ram Ambre、Qing Wang、Wei-Chih Lee、Pen-Cheng Wang、Yuhua Liu、Lili Zhao、Tiow-Gan Ong
DOI:10.1021/acscatal.8b03436
日期:2018.12.7
Inert aryl methyl ethers as coupling components via C–O activation have been established with a Ni catalyst for C–H activation of heteroarene. The key to simultaneous C–H/C–O bond activation is the use of sterically demanding o-tolylMgBr. The protocol is effective for a wide scope of substrates including naphthyl methyl ethers, anisoles, and a variety of other heteroarene derivatives. Detailed mechanistic
Substituted phenyl naphthalenes as estrogenic agents
申请人:Wyeth
公开号:US20030181519A1
公开(公告)日:2003-09-25
This invention provides estrogen receptor modulators of formula I, having the structure
1
wherein
R
1
, R
2
, R
3
, R
4
, R
5
, R
6
, R
7
, R
8
, R
9
, and R
10
, are as defined in the specification, or a pharmaceutically acceptable salt thereof.
[EN] PPAR MODULATORS<br/>[FR] MODULATEURS DU RECEPTEUR ACTIVE DE LA PROLIFERATION DES PEROXYSOMES (PPAR)
申请人:LILLY CO ELI
公开号:WO2005019151A1
公开(公告)日:2005-03-03
The present invention is directed to a compound of formula I, or a pharmaceutically acceptable salt, solvate, hydrate or stereoisomer thereof, which is useful in treating or preventing disorders mediated by a peroxisome proliferator activated receptor (PPAR) such as syndrome X, type II diabetes, hyperglycemia, hyperlipidemia, obesity, coagaulopathy, hypertension, arteriosclerosis, and other disorders related to syndrome X and cardiovascular diseases.
The Role of Gold Acetylides as a Selectivity Trigger and the Importance of <i>gem</i>-Diaurated Species in the Gold-Catalyzed Hydroarylating-Aromatization of Arene-Diynes
作者:A. Stephen K. Hashmi、Ingo Braun、Matthias Rudolph、Frank Rominger
DOI:10.1021/om200946m
日期:2012.1.23
investigations were undertaken, giving new insights into the so-far underestimated role of acetylides in gold chemistry. The gold plays a fascinating dual role serving to both catalyze the reaction and activate the substrate by Au–C-σ bond formation. Evidence of gem-diaurated compounds playing an important part for gold catalysis is also reported.