有效地实现了布朗斯台德酸介导的内烯烃α-氧代乙烯酮二硫缩醛与吡咯的环化反应,得到环戊[ b ]吡咯。一对具有酸强度的布朗斯台德酸,即三氟乙酸和对甲苯磺酸水合物,被用于促进环化反应。生成的产物很容易被间氯过氧苯甲酸氧化成砜。随后用1,8-二氮杂双环[5.4.0]十一碳-7-烯处理得到脱硫的烯烃中间体脱硫的末端烯烃或[2 + 2]环加成产物。本协议提供了在温和条件下易于访问结构多样的环戊[ b ]吡咯衍生物的方法。
C-H Arylation of <i>N</i>
-Heteroarenes under Metal-Free Conditions and its Application towards the Synthesis of Pentabromo- and Pentachloropseudilins
作者:Mukesh Kumar、Shweta Sharma、Parijat Sil、Manoj Kushwaha、Satyajit Mayor、Ram A. Vishwakarma、Parvinder Pal Singh
DOI:10.1002/ejoc.201900353
日期:2019.6.16
Herein, we have developed a metal‐free and mild condition for the synthesis of 2‐arylated heteroarenes. The complex forming property and charge transfer property of phenothiazine expanded its application towards catalysis The optimized condition has been successfully employed for the synthesis important marine natural product namely pentabromo/chloropseudilins (PBP/PCP). The synthesized Pentachloropseudilin
2-Phenylpyrroles as conformationally restricted benzamide analogs. A new class of potential antipsychotics. 2
作者:Ineke Van Wijngaarden、Chris G. Kruse、Jan A. M. Van der Heyden、Martin T. M. Tulp
DOI:10.1021/jm00118a011
日期:1988.10
A series of 2-phenylpyrrole Mannichbases was synthesized and screened in pharmacological models for antipsychotic activity and extrapyramidal effects. Structure modifications of 5-(4-fluorophenyl)-2-[[4-(2-methoxyphenyl)-1-piperazinyl]methyl]pyrrole (1), the prototype of a new class of sodium-independent atypical dopamine D-2 antagonists, resulted in 2-[[4-(7-benzofuranyl)-1-piperazinyl]methyl]-5
A case of chain propagation: α-aminoalkyl radicals as initiators for aryl radical chemistry
作者:Timothée Constantin、Fabio Juliá、Nadeem S. Sheikh、Daniele Leonori
DOI:10.1039/d0sc04387g
日期:——
The generation of aryl radicals from the corresponding halides by redox chemistry is generally considered a difficult task due to their highly negative reduction potentials. Here we demonstrate that α-aminoalkyl radicals can be used as both initiators and chain-carriers for the radical coupling of aryl halides with pyrrole derivatives, a transformation often employed to evaluate new highly reducing
Generation of Aryl Radicals from Aryl Halides: Rongalite-Promoted Transition-Metal-Free Arylation
作者:Fazhi Yu、Runyu Mao、Mingcheng Yu、Xianfeng Gu、Yonghui Wang
DOI:10.1021/acs.joc.9b01113
日期:2019.8.16
is reported. Rongalite as a novel precursor of super electron donors was used to initiate a series of electron-catalyzed reactions under mild conditions. These transition-metal-free radical chain reactions enable the efficient formation of C–C, C–S, and C–P bonds through homolytic aromatic substitution or SRN1 reactions. Moreover, the synthesis of antipsychoticdrug Quetiapine was performed on gram
Brønsted Acid-Promoted Cascade Alkylation/Cyclization of Pyrroles with<i>N</i>,<i>N</i>-Dimethylaminomethyleneglutaconic Acid Dinitrile: A Concise Route to Cyclopenta[<i>b</i>]pyrroles
A Brønstedacid (p-TsOH⋅H2O) promoted alkylation/cyclizationcascade reaction of pyrroles with N,N-dimethylaminomethyleneglutaconicaciddinitrile was efficiently realized to afford functionalized cyclopenta[b]pyrroles with excellent diastereoselectivity. Deamination of the corresponding ammonium salts of the cyclopenta[b]pyrroles with methyl iodide led to dihydrocyclopenta[c]pyrroles. The cascade reaction
有效地实现了布朗斯台德酸(p -TsOH·H 2 O)促进吡咯与N,N-二甲基氨基亚甲基戊二酸二腈的烷基化/环化级联反应,从而提供具有优异非对映选择性的官能化环戊[ b ]吡咯。环戊[ b ]吡咯的相应铵盐与甲基碘的脱氨基反应生成二氢环戊[ c ]吡咯。通过反应中间体,即2-烷基化吡咯的分离和转化,证实了级联反应途径。