Rapid access to diverse, trifluoromethyl-substituted alkenes using complementary strategies
作者:James P. Phelan、Rebecca J. Wiles、Simon B. Lang、Christopher B. Kelly、Gary A. Molander
DOI:10.1039/c7sc05420c
日期:——
alkenes, cross-coupling or related functionalization processes at distal electrophilic sites can be executed without inducing Peterson elimination. Subsequent Lewis acidic activation affords functionalized α-trifluoromethyl alkenes. Likewise, the development of a novel α-trifluoromethylvinyl trifluoroborate reagent complements this approach and allows a one-step cross-coupling of (hetero)arylhalides to
The hydrodefluorination of CF3-substituted alkenes can be catalyzed by a nickel(II) hydride bearing a pincer ligand. The cata-lyst loading can be as low as 1 mol%. gem-Difluoroalkenes containing a number of functional groups can be formed in good to excellent yields, by a radical mechanism initiated by H• transfer from the nickel hydride. The relative reactivity of various substrates supports the proposed
CF3 取代烯烃的加氢脱氟可以由带有钳状配体的镍 (II) 氢化物催化。催化剂负载量可以低至 1 mol%。通过从氢化镍中转移 H• 引发的自由基机制,可以以良好到极好的产率形成含有许多官能团的 gem-二氟烯烃。各种底物的相对反应性支持所提出的机制,TEMPO 捕获实验也是如此。
Open-Air Alkylation Reactions in Photoredox-Catalyzed DNA-Encoded Library Synthesis
作者:James P. Phelan、Simon B. Lang、Jaehoon Sim、Simon Berritt、Andrew J. Peat、Katelyn Billings、Lijun Fan、Gary A. Molander
DOI:10.1021/jacs.9b00669
日期:2019.2.27
by the pharmaceutical industry for the identification of compounds with affinity to biomolecular targets. Success in this endeavor lies in sampling diverse chemical libraries. However, current DELs tend to be deficient in C(sp3) carboncounts. We report unique solutions to the challenge of increasing both the chemical diversity of these libraries and their C(sp3) carboncounts by merging Ni/photoredox
DNA 编码文库 (DEL) 技术是制药行业常用的强大工具,用于鉴定对生物分子靶标具有亲和力的化合物。这项努力的成功在于对不同的化学库进行采样。然而,当前的 DEL 往往缺乏 C(sp3) 碳计数。我们报告了通过合并 Ni/photoredox 双催化 C(sp2)-C(sp3) 交叉偶联以及光氧化还原催化自由基来增加这些库的化学多样性及其 C(sp3) 碳数的挑战的独特解决方案/polar 交叉烷基化协议与 DEL。多类自由基源的成功整合能够快速整合不同的烷基片段。
The present invention provides compounds of formula (I): Formula (I) which are useful for long-lasting treatment and control of pests, for example fleas and ticks, in companion animals and livestock, and pharmaceutical compositions and methods of using the same.