N-(2-Diazo-3-oxoalkanoyl)glycine esters. I. Synthesis of 4- and 5-phenoxyl derivatives and isomerization of N-(2-diazo-3-oxo-3-phenylpropanoyl)glycine ethyl ester
bonds has been accomplished through radical translocation and cross-coupling. Upon irradiation with visible light, copper-based photocatalyst [Cu(Xantphos)(dmp)]BF4 enabled cross-coupling of N-alkoxyphthalimides with amino acid esters or amino acids to provide δ-C(sp3)–H alkylated alcohols (31 examples, up to 92% yield) with additive BNDHP or α-C(sp3)–H alkylated alcohols (18 examples, up to 86% yield)
Enantioselective synthesis of arylglycine derivatives by direct C–H oxidative cross-coupling
作者:Xiao-Hong Wei、Gang-Wei Wang、Shang-Dong Yang
DOI:10.1039/c4cc07361d
日期:——
A new method for the synthesis of chiral alpha-amino acid derivatives by enantioselective C-H arylation of N-aryl glycineesters with aryl boric acids in the presence of a chiral Pd(II)-catalyst has been developed. This work successfully integrates the direct C-H oxidation with asymmetric arylation and exhibits excellent enantioselectivity.
High-Throughput Screening and Hit Validation of Extracellular-Related Kinase 5 (ERK5) Inhibitors
作者:Stephanie M. Myers、Ruth H. Bawn、Louise C. Bisset、Timothy J. Blackburn、Betty Cottyn、Lauren Molyneux、Ai-Ching Wong、Celine Cano、William Clegg、Ross. W. Harrington、Hing Leung、Laurent Rigoreau、Sandrine Vidot、Bernard T. Golding、Roger J. Griffin、Tim Hammonds、David R. Newell、Ian R. Hardcastle
DOI:10.1021/acscombsci.5b00155
日期:2016.8.8
The extracellular-related kinase 5 (ERK5) is a promising target for cancer therapy. A high-throughput screen was developed for ERK5, based on the IMAP FP progressive binding system, and used to identify hits from a library of 57 617 compounds. Four distinct chemical series were evident within the screening hits. Resynthesis and reassay of the hits demonstrated that one series did not return active
Synthesis and organogelating behaviour of amino acid-functionalised triphenylenes
作者:Jonathan E. Meegan、Xiaofei Yang、Ratana Rungsirisakun、Sebastian C. Cosgrove、Richard J. Bushby、Amin Sadeghpour、Michael Rappolt、Rik Brydson、Richard J. Ansell
DOI:10.1039/c7sm00676d
日期:——
been prepared with glycine, L-alanine, L-phenylalanine and L-tryptophan ethyl ester side-chains. The glycine derivative is a good gelator of chloroform, the alanine derivative gels ethanol and toluene, and the phenylalaninederivative gels benzene and toluene. The tryptophan derivative does not gel any of the solvents tested, most probably due to its more bulky structure, but forms microspheres by evaporation-induced
Amphiphilic EuDOTA‐Tetraamide Complexes Form Micelles with Enhanced CEST Sensitivity
作者:Osasere M. Evbuomwan、Garry Kiefer、A. Dean Sherry
DOI:10.1002/ejic.201101369
日期:2012.4
equations increased in parallel with an increase in alkyl carbon chain-length. By comparisons with the monomethylamide complex, which served as control, the data illustrate that micelle formation serves to slow the rate of water exchange in these systems. The complex having the largest CEST effect per unit Eu(III) concentration (the C(16) analog) had a detection limit of 5.3 μM. This represents an approximate
报道了四种具有可变烷基链长度(C(1)、C(12)、C(14) 和 C(16))的新型 DOTA-四酰胺配体及其各自的铕 (III) 配合物的合成和表征。三个具有长烷基链的 EuL 复合物自发形成不同大小的胶束。每种复合物的临界胶束浓度不同(C(16) 复合物低于 C(12) 复合物),而胶束尺寸随着烷基链长度的增加而增加。化学交换饱和转移 (CEST) 实验表明,所有四种 Eu(III) 配合物均表现出慢至中等的水交换动力学。正如预期的那样,由于水交换速度加快,这些复合物中的 CEST 信号随着温度的升高而降低,但有趣的是,C(14) 和 C(16) 复合物的 CEST 信号在 25°C 附近达到最大值,与交换限制的 CEST 一致。或接近室温。通过将 CEST 光谱拟合到 Bloch 方程获得的水停留寿命随着烷基碳链长度的增加而增加。通过与作为对照的单甲酰胺复合物进行比较,数据表明胶束