Radical Arylation of Phenols, Phenyl Ethers, and Furans
作者:Alexander Wetzel、Gerald Pratsch、Roman Kolb、Markus R. Heinrich
DOI:10.1002/chem.200902927
日期:2010.2.22
efficient, and cost‐effective new access to diversely functionalized biphenyl alcohols and ethers. Free phenolic hydroxy groups, aromatic and aliphatic amines, as well as amino acid substructures, are well tolerated. Two examples for the applicability of the methodology are the partialsynthesis of a β‐secretase inhibitor and the synthesis of a calcium‐channel modulator.
Visible-Light-Induced, Catalyst-Free Radical Arylations of Arenes and Heteroarenes with Aryldiazonium Salts
作者:Michael C. D. Fürst、Eva Gans、Michael J. Böck、Markus R. Heinrich
DOI:10.1002/chem.201703954
日期:2017.11.2
photocatalyst and other additives, the radical arylation of diverse arenes and heteroarenes has been achieved with aryldiazonium salts under visible‐light irradiation from a blue light‐emitting diode (LED). Although the course of some reactions can be rationalized by the formation of strongly light‐absorbing charge‐transfer (CT) complexes between the diazonium ion and the aromatic substrate, several
Furan ring opening–pyrrole ring closure: a new synthetic route to aryl(heteroaryl)-annulated pyrrolo[1,2-a][1,4]diazepines
作者:Alexander V. Butin、Tatyana A. Nevolina、Vitaly A. Shcherbinin、Igor V. Trushkov、Dmitry A. Cheshkov、Gennady D. Krapivin
DOI:10.1039/c002994g
日期:——
presence of alkyl or aryl groups on amide nitrogen due to competitive furfuryl cation elimination. But alkylation of pyrrolo[1,2-a][1,4]benzodiazepines yields efficiently the corresponding N-alkyl derivatives. Steric effects also prevent cyclization due to reversibility of diazepine ring formation under these reaction conditions. However, the corresponding pyrrolo[1,2-a][1,4]benzodiazepines can be obtained
描述了吡咯并[1,2- a ] [1,4]苯并二氮杂s的合成方法。该方法是基于用Na 2 O 3处理的N-(糠基)蒽酰胺的再循环。盐酸/醋酸 系统,并允许两者同时形成 地西平和吡咯环一步就形成。反应通过 呋喃开环成二酮部分,随后NH 2-基团与两个羰基官能团连续相互作用。由于竞争性糠基阳离子消除,该方法在酰胺氮上存在烷基或芳基的情况下效率不高。但是吡咯并[1,2- a ] [1,4]苯并二氮杂卓的烷基化有效地产生了相应的N-烷基衍生物。在这些反应条件下,由于二氮杂ring环形成的可逆性,立体效应也阻止了环化作用。但是,相应的吡咯并[1,2- a ] [1,4]苯并二氮杂卓可通过逐步方法获得,即1)呋喃环开环为aq。盐酸/醋酸 和2)在冰河处理下,将分离的氨基二酮环化 醋酸。合成吡咯并[1,2- a ] [1,4]苯并二氮杂卓的另一种有效方法是酸催化N-(糠基)-2-硝基苯甲酰胺的呋喃环开环,然后处理所形成的吡咯并[1
Furan Ring Opening-Pyrrole Ring Closure: Simple Route to 5-Alkyl-2-(aminomethyl)pyrroles
A simple route to 5-alkyl-2-(aminomethyl)pyrroles is proposed that is based on hydrolytic ringopening of 5-alkylfurfurylamines followed by pyrrole ringclosure under Paal-Knorr conditions. furans-ringopening-ringclosure- pyrroles - polycycles
作者:Lisa-Marie Altmann、Michael C. D. Fürst、Eva I. Gans、Viviane Zantop、Gerald Pratsch、Markus R. Heinrich
DOI:10.1021/acs.orglett.9b04237
日期:2020.1.17
Aryl radicals generated in the aqueous phase of biphasic mixtures have-regardless of a comparably low polarity- a strong preference to react with aromatic substrates in the aqueous phase and not to undergo phase-transfer into a lipophilic phase, independent from the presence of a surfactant. These results represent an important prerequisite toward future studies in biological systems, which typically