A simple deprotection of triflate esters of phenol derivatives
摘要:
Efficient conversion of aryl triflates into the corresponding phenols has been accomplished with Et4NOH. In contrast to other cleavage reactions, such functional groups as nitro, ketone, halogen, amide and sulfonamide groups were intact under the reaction conditions. This mild removal of the trifluoromethanesulfonyl group would serve a new protecting group of phenols. (C) 2004 Elsevier Ltd. All rights reserved.
Ni-Catalyzed Cross-Electrophile Coupling of Aryl Triflates with Thiocarbonates via C–O/C–O Bond Cleavage
作者:Zhaodong Zhu、Yuxin Gong、Weiqi Tong、Weichao Xue、Hegui Gong
DOI:10.1021/acs.orglett.1c00313
日期:2021.3.19
A nickel-catalyzed reductive coupling of aryl triflates with thiocarbonates is reported here. Both electron-rich and -deficient aryl C(sp2)–O electrophiles as well as a class of O-tBu S-alkyl thiocarbonates are compatible with the optimized reaction conditions, as evidenced by 49 examples. The reaction also proceeds with good chemoselective cleavage of the C–O bond with regard to thioesters. This work
此处报道了芳基三氟甲磺酸酯与硫代碳酸酯的镍催化还原偶联。富电子和不足的芳基C(sp 2)-O亲电体以及一类O - t Bu S-烷基硫代碳酸酯都与优化的反应条件兼容,如49个实例所示。对于硫代酯,该反应还会以良好的C–O键化学选择性裂解来进行。这项工作拓宽了镍催化的还原交叉亲电子偶联反应的范围。
[EN] LIGANDS FOR ENHANCED IMAGING AND DRUG DELIVERY TO NEUROBLASTOMA CELLS<br/>[FR] LIGANDS POUR IMAGERIE AMÉLIORÉE ET ADMINISTRATION DE MÉDICAMENT À DES CELLULES DE NEUROBLASTOME
申请人:UNIV MADRID COMPLUTENSE
公开号:WO2019185586A1
公开(公告)日:2019-10-03
The present invention concerns aminobenzylguanidine derivative ligands specifically targeting neuroblastoma cells with an improved cellular uptake. The improved cellular uptake provides for the therapeutic and diagnostic use of the ligands in neuroblastoma-related diseases.
A bis(5-aryl-2-pyridyl) compound represented by formula (1) or a salt thereof:
1
wherein A is a substituted or unsubstituted aromatic hydrocarbon group or a substituted or unsubstituted aromatic heterocyclic group, and X is a group selected from the group consisting of moieties having formulas (2) to (5):
2
wherein, in formula (2), m is an integer of 1 or 2; in formula (3), n is an integer of 1 to 6; and in formula (4), R is hydrogen or a lower alkyl group and p is an integer of 1 to 6.
macrocyclic lactams comprised of a pyridine, four oxazoles and a phenyl ring. A derivative having a 2-(dimethylamino)ethyl chain attached to the 5-position of the phenyl ring was recently identified as a selective G-quadruplex stabilizer with excellent cytotoxic activity, and good in vivo anticancer activity against a human breast cancer xenograft in mice. Here we detail the synthesis of eight new
Effects of Dendronization on the Linear and Third-Order Nonlinear Optical Properties of Bis(thiopyrylium) Polymethine Dyes in Solution and the Solid State
作者:Annabelle Scarpaci、Arpornrat Nantalaksakul、Joel M. Hales、Jonathan D. Matichak、Stephen Barlow、Mariacristina Rumi、Joseph W. Perry、Seth R. Marder
DOI:10.1021/cm3002139
日期:2012.5.8
Effects of the size and attachment position of benzyl aryl ether dendrons covalently attached to bis(thiopyrylium) penta- and heptamethines on the opticalproperties of these dyes in solution and in solid films have been investigated. In dilute solution the low-energy absorption bands of some of the dendronized species differ from those of the parent compounds in having much smaller transition dipole