Cu/Mn Co-oxidized Cyclization for the Synthesis of Highly Substituted Pyrrole Derivatives from Amino Acid Esters: A Strategy for the Biomimetic Syntheses of Lycogarubin C and Chromopyrrolic Acid
作者:Nini Zhou、Tao Xie、Lin Liu、Zhixiang Xie
DOI:10.1021/jo500740w
日期:2014.7.3
An effective and concise approach to synthesis of tetrasubstituted pyrroles from readily available aminoacidesters by the promotion of Cu(OAc)2 in conjunction with Mn(OAc)3 has been developed. This reaction proceeds through multiple dehydrogenations, deamination, and oxidative cyclization. This oxidized system tolerates substrates bearing various electron-donating or electron-withdrawing groups.
Cu<sup>II</sup>/TEMPO-Promoted One-Pot Synthesis of Highly Substituted Pyrimidines from Amino Acid Esters
作者:Nini Zhou、Tao Xie、Zhongle Li、Zhixiang Xie
DOI:10.1002/chem.201405447
日期:2014.12.22
A novel, Cu(OAc)2/TEMPO promoted one‐step approach for the preparation of fully substitutedpyrimidinesfrom readily available aminoacidesters has been described. In this reaction, the aminoacidesters act as the only NC sources for the construction of corresponding pyrimidines. The mechanism of this process includes oxidative dehydrogenation, the generation of an imine radical, and a formal [3+3]
Backbone-enabled site-selective modification of peptides with benzoquinone via Pd-catalyzed δ-C(sp2)–H functionalization has been achieved. The amide groups of peptides serve as internal directional groups, facilitating C–H functionalization through a kinetically less favored six-membered palladacycle. This methodology presents novel opportunities for the late-stage site-selective diversification of
Scaffold-hopping with zwitterionic CCR3 antagonists: Identification and optimisation of a series with good potency and pharmacokinetics leading to the discovery of AZ12436092
作者:Ash Bahl、Patrick Barton、Keith Bowers、Moya V. Caffrey、Rebecca Denton、Peter Gilmour、Shaun Hawley、Tero Linannen、Christopher A. Luckhurst、Tobias Mochel、Matthew W.D. Perry、Robert J. Riley、Emma Roe、Brian Springthorpe、Linda Stein、Peter Webborn
DOI:10.1016/j.bmcl.2012.08.103
日期:2012.11
The discovery and optimisation of a series of zwitterionic CCR3 antagonists is described. Optimisation of the structure led to AZ12436092, a compound with excellent selectivity over activity at hERG and outstanding pharmacokinetics in preclinical species. (C) 2012 Elsevier Ltd. All rights reserved.