Catalytic Ring-Opening of Cyclic Alcohols Enabled by PCET Activation of Strong O–H Bonds
作者:Hatice G. Yayla、Huaiju Wang、Kyle T. Tarantino、Hudson S. Orbe、Robert R. Knowles
DOI:10.1021/jacs.6b06517
日期:2016.8.31
the redox-neutral isomerization of cyclic alcohols to linear ketones via C-C bond scission. Mechanistic studies demonstrate that key alkoxy radical intermediates in this reaction are generated via the direct homolytic activation of alcohol O-H bonds in an unusual intramolecular PCET process, wherein the electron travels to a proximal radical cation in concert with proton transfer to a weak Brønsted base
我们报告了一种新的光催化协议,用于通过 CC 键断裂将环醇氧化还原中性异构化为线性酮。机理研究表明,该反应中的关键烷氧基自由基中间体是通过在不寻常的分子内 PCET 过程中通过醇 OH 键的直接均裂活化而产生的,其中电子传播到邻近的自由基阳离子,同时质子转移到弱的布朗斯台德碱。显示有效的键强度考虑因素可以准确预测使用给定氧化剂/碱基对生成烷氧基自由基的可行性。
Diels–Alder/Ene Reactivities of 2-(1′-Cycloalkenyl)thiophenes and 2-(1′-Cycloalkenyl)benzo[<i>b</i>]thiophenes with <i>N</i>-Phenylmaleimides: Role of Cycloalkene Ring Size on Benzothiophene and Dibenzothiophene Product Distributions
作者:Wayland E. Noland、Honnaiah Vijay Kumar、Yernaidu Reddi、Christopher J. Cramer、Alexei V. Novikov、Hyejin Kim、Yumeng Zhu、Yoke Ching Chin、Yuqi Zhou、Predrag Radakovic、Anjola Uprety、Jun Xie、Grant C. Flick
DOI:10.1021/acs.joc.9b03363
日期:2020.4.17
benzothiophene are the important class of bioactive compounds found abundant in nature. The Diels–Alder reactions of 2-(1′-cycloalkenyl)thiophenes and 2-(1′-cycloalkenyl)benzo[b]thiophenes having the alkene groups present in five-, six-, seven-, eight-, and twelve-membered rings with substituted N-phenylmaleimides are characterized. The size of the cycloalkene rings plays a critical role in dictating the
噻吩和苯并噻吩的支架是自然界中发现的丰富的生物活性化合物的重要类别。2-(1'-环烯基)噻吩和2-(1'-环烯基)苯并[ b ]噻吩的Diels-Alder反应具有在五个,六个,七个,八个和十二个烷基中存在的烯基N取代的成员环-苯基马来酰亚胺被表征。环烯环的大小在决定预期的和异构化的Diels-Alder加合物的产物分布中起着至关重要的作用。2D NMR研究表明,具有五,六和七元环的2-(1'-环烯基)噻吩的分离的异构体是芳构化的苯并噻吩产物,而八和十二元环是未重排的加合物。另外,对于五元和六元环的情况,分离出随后的与N-苯基马来酰亚胺的烯反应的产物。有趣的是,在2-(1'-环烯基)苯并[ b具有五元,六元,七元,八元和十二元环的]噻吩,在任何情况下均未分离未重排的二苯并噻吩Diels-Alder加合物。进行分子力学和密度泛函理论(M06-2X和PBE0-D3)的计算是为了了解各种二烯对于
Synthesis and biological evaluation of 1-[1-(2-benzo[b]thienyl)cyclohexyl]piperidine homologs at dopamine-uptake and phencyclidine-, and .sigma.-binding sites
作者:Xiao Shu He、Lionel P. Raymon、Mariena V. Mattson、Mohyee E. Eldefrawi、Brian R. de Costa
DOI:10.1021/jm00061a009
日期:1993.4
related to BTCP exhibited greater selectivity for sites labeled by [3H]BTCP. However, several of the BTCP-related derivatives showed greater (compared with BTCP and cocaine) ability to displace [3H]cocaine. Most notably, 1-[1-(2-benzo[b]thienyl)cyclohexyl]pyrrolidine (7) exhibited a 3.4-fold greater affinity for these sites compared with BTCP and a 9-fold greater affinity at these sites than cocaine
Synthesis and structure–activity relationships of novel poly(ADP-ribose) polymerase-1 inhibitors
作者:Ming Tao、Chung Ho Park、Ron Bihovsky、Gregory J. Wells、Jean Husten、Mark A. Ator、Robert L. Hudkins
DOI:10.1016/j.bmcl.2005.10.099
日期:2006.2
A series of novel pyrrolocarbazoles was synthesized as potential PARP-1 inhibitors. Pyrrolocarbazole 1 was identified as a potent PARP-I inhibitor (IC50 = 36 nM) from our internal database. Synthesis of analogs around this template with the aid of modeling studies led to the identification of the truncated imide 14. Compound 14 (IC50 = 40 nM), with deleted B-ring, was found to be an equipotent PARP-1 inhibitor. (c) 2005 Elsevier Ltd. All rights reserved.
Enantioselective Hydroazidation of Trisubstituted Non-Activated Alkenes
作者:Daniel Meyer、Philippe Renaud
DOI:10.1002/anie.201703340
日期:2017.8.28
A one-pot procedure for the enantioselective hydroazidation of non-activated trisubstituted alkenes is described. Hydroboration with monoisopinocampheylborane (IpcBH2) provides dialkylboranes that are in situ selectively converted into monoalkyl-substituted catecholboranes; these undergo radical azidation upon treatment with benzenesulfonyl azide and a radical initiator. Enantiomerically enriched azides