The ability to convert a suitably disposed azide group into the corresponding diazo compound has been demonstrated. (C) 1998 Elsevier Science Ltd. All rights reserved.
Catalyst- and Substituent-Controlled Regio- and Stereoselective Synthesis of Indolyl Acrylates by Lewis-Acid-Catalyzed Direct Functionalization of 3-Formylindoles with Diazo Esters
作者:Sana Jamshaid、Shreedhar Devkota、Yong Rok Lee
DOI:10.1021/acs.orglett.1c00277
日期:2021.3.19
A facile and efficient In(OTf)3- and BF3·OEt2-catalyzed direct transformation of 3-formylindoles with diazo esters has been developed for synthesizing diverse and functionalized indolyl acrylates. This one-pot protocol furnishes various (Z)-α-hydroxy-β-indolyl acrylates, (E)-β-(2-alkoxy-2-oxoethoxy)-α-indolyl acrylates, and (Z)-3-hydroxy-2-indolyl acrylates by a catalyst- and substituent-controlled
<i>N</i>,<i>N</i>‘-Ditosylhydrazine: A Convenient Reagent for Facile Synthesis of Diazoacetates
作者:Tatsuya Toma、Jun Shimokawa、Tohru Fukuyama
DOI:10.1021/ol701432k
日期:2007.8.1
A novel entry to the synthesis of diazoacetates is disclosed. A variety of diazoacetates were synthesized from the corresponding bromoacetates by treatment with N,N'-ditosylhydrazine in moderate to high yields. Ease of operation with the stable crystalline reagent as well as a short reaction time offer a useful alternative to the conventional methods.
An
<i>N</i>
‐Trifluoromethylation/Cyclization Strategy for Accessing Diverse
<i>N</i>
‐Trifluoromethyl Azoles from Nitriles and 1,3‐Dipoles
作者:Ru Zhong Zhang、Ru Xue Zhang、Shuang Wang、Cong Xu、Wei Guan、Mang Wang
DOI:10.1002/anie.202110749
日期:2022.1.3
A scalable N-trifluoromethylative cyclizationstrategy is reported to construct N-CF3 tetrazoles/imidazoles/1,2,3-triazoles. N-CF3 nitrilium derivatives are obtained via the N-trifluoromethylation of nitriles and well used as NCF3-containing synthons in 1,3-dipolar cyclizations for the first time. A generic platform for accessingdiverse N-CF3 azoles is thus provided.
Porphyrins as Photoredox Catalysts: Experimental and Theoretical Studies
作者:Katarzyna Rybicka-Jasińska、Wenqian Shan、Katarzyna Zawada、Karl M. Kadish、Dorota Gryko
DOI:10.1021/jacs.6b09036
日期:2016.11.30
only are vital in biological systems but also are valuable catalysts in organic synthesis. On the other hand, catalytic properties of free base porphyrins have been less explored. They are mostly known as efficient photosensitizers for the generation of singlet oxygen via photoinduced energytransfer processes, but under light irradiation, they can also participate in electrontransfer processes. Indeed
Photocatalytic Reaction of Diazo Compounds with Aldehydes
作者:K. Rybicka-Jasińska、Ł. W. Ciszewski、D. Gryko
DOI:10.1002/adsc.201600084
日期:2016.5.19
Photocatalytic reactions of diazoacetates with aldehydes led to α‐alkylated carbonyl compounds instead of the expected cyclopropane derivatives. The reaction requires a dual catalytic system – photocatalysis merged with enamine‐iminium catalysis. NMR, EPR, UV/Vis, and ESI‐MS analyses provided sufficient data to corroborate the proposed radical mechanism – enamine catalysis merged with photocatalysis