Use of 1,2,3-trisubstituted cyclopropanes as conformationally constrained peptide mimics in SH2 antagonists
摘要:
Novel conformationally constrained phosphotyrosine pseudopeptide derivatives of the tetrapeptide pY-E-E-I were prepared and evaluated as SH2 binding antagonists. (C) 2000 Elsevier Science Ltd. All rights reserved.
Zn- and Cu-Catalyzed Coupling of Tertiary Alkyl Bromides and Oxalates to Forge Challenging C–O, C–S, and C–N Bonds
作者:Yuxin Gong、Zhaodong Zhu、Qun Qian、Weiqi Tong、Hegui Gong
DOI:10.1021/acs.orglett.0c04206
日期:2021.2.5
We describe here the facile construction of sterically hindered tertiary alkyl ethers and thioethers via the Zn(OTf)2-catalyzed coupling of alcohols/phenols with unactivated tertiary alkyl bromides and the Cu(OTf)2-catalyzed thiolation of unactivated tertiary alkyloxalates with thiols. The present protocol represents one of the most effective unactivated tertiary C(sp3)–heteroatom bond-forming conditions
Photocatalytic Oxidative Iodination of Electron‐Rich Arenes
作者:Rok Narobe、Simon J. S. Düsel、Jernej Iskra、Burkhard König
DOI:10.1002/adsc.201900298
日期:2019.9.3
A visible‐light‐mediated oxidative iodination of electron‐rich arenes has been developed. 2.5 mol% of unsubstituted anthraquinone as photocatalyst were used in combination with elementary iodine, trifluoroacetic acid and oxygen as the terminal oxidant. The iodination proceeds upon irradiation in non‐ or weakly‐electron donating solvents (DCM, DCE and benzene) wherein a spectral window in strongly coloured
There is disclosed a method for producing a biaryl compound of formula (I):
1
wherein R
1
is the same or different and independently denotes a substituted or unsubstituted hydrocarbon group or the like, A and B denote an aromatic hydrocarbon ring having from 6 to 14 carbon atoms or the like, k and m independently denote an integer of from 0 to 5, and 1 denotes an integer of 1 or 2, which method is characterized by reacting an aromatic compound of formula (II):
2
wherein R
1
, k and l denote the same as defined above, and X
1
denotes a leaving group, with a Grignard reagent of formula (III):
3
(R
2
). 9MgX
2
(IIIg)
wherein R
2
, B, and m denote the same as defined above and X
2
denotes chlorine or the like, in the presence of a cyclic ether, or an acyclic ether having two or more ether oxygens in the molecule and a nickel catalyst.
1,5-DIARYLPYRROLE DERIVATIVES, PREPARATION METHOD THEREOF AND APPLICATION OF SAME IN THERAPEUTICS
申请人:BARTH Francis
公开号:US20080015245A1
公开(公告)日:2008-01-17
The invention relates to compounds having formula (I):
Wherein X, R
1
, R
2
, R
3
, R
4
, R
5
and R
6
are as defined herein. The invention also relates to a method of preparing said compounds and to die application thereof in therapeutics.
Transition-Metal-Free Ring-Opening Silylation of Indoles and Benzofurans with (Diphenyl-<i>tert</i>
-butylsilyl)lithium
作者:Pan Xu、Ernst-Ulrich Würthwein、Constantin G. Daniliuc、Armido Studer
DOI:10.1002/anie.201707309
日期:2017.10.23
A practical method is presented for ring opening various indoles and benzofurans with concomitant stereoselective silylation using readily generated (diphenyl‐tert‐butylsilyl)lithium to afford ortho‐β‐silylvinylanilines or ‐phenols. Dearomatization of the heteroarene core proceeds in the absence of any transition‐metal catalyst through addition of a silyl anion and a subsequent stereoselective β‐elimination