Aggregative activation and heterocyclic chemistry I complex bases promoted arynic cyclisation of imines or enaminoketones; regiochemical synthesis of indoles
摘要:
The complex base NaNH2-t-BuONa allowed expeditious syntheses of indoles by arynic cyclisation of imines or enaminoketones prepared from halogeno anilines and carbonyl derivatives. Unstable imines may be used without purification, complex bases being unsensitive to impurities. It is showed that this kind of reaction may be applied to mixture of substrates suitably halogenated on the benzene ring. Formation of three components aggregates is proposed to explain a number of observations.
An Electrophilic Bromine Redox Catalysis for the Synthesis of Indole Alkaloid Building Blocks by Selective Aliphatic C−H Amination
作者:Julien Bergès、Belén García、Kilian Muñiz
DOI:10.1002/anie.201808939
日期:2018.11.26
A new homogeneous bromine(−I/I) redox catalysis is described, which is based on monomeric bromine(I) compounds containing transferable phthalimidato groups. These catalysts enable intermolecular C−H amination reactions at previously unaccessible aliphatic positions and thus enlarge the synthetic potential of direct C−N bond formation, including its application in the synthesis of alkaloid building
Microwave‐Assisted Rapid One‐Pot Synthesis of Fused and Non‐Fused Indoles and 5‐[
<sup>18</sup>
F]Fluoroindoles from Phenylazocarboxylates
作者:Jasmin Krüll、Anja Hubert、Natascha Nebel、Olaf Prante、Markus R. Heinrich
DOI:10.1002/chem.201703890
日期:2017.11.16
On the fast track: Phenylazocarboxylates can be converted to indoles via a rapid one-pot reaction comprising a microwave-assisted Fischer indole synthesis. The advantage that phenylazocarboxylates can beforehand be modified by mild nucleophilic aromatic substitution also enables an application of the strategy for the preparation of 5-[18F]fluoroindoles.
heteroarenyne (heteroarene–alkyne) cycloisomerization involving the dearomative transformation of endocyclic aromatic C=C bonds remains unknown. Herein, we communicate a PdH‐catalyzed enantioselective heteroarenyne cycloisomerization reaction of alkyne‐tethered indole substrates (formal 1,5‐ and 1,6‐enynes). Based on this strategy, a variety of structurally diverse chiral spiro and fused indoline derivatives
Molecular construction of multitarget neuroprotectors 4.* Synthesis and biological activity of conjugates of carbazoles and tetrahydrocarbazoles
作者:V. B. Sokolov、A. Yu. Aksinenko、T. V. Goreva、T. A. Epishina、L. G. Dubova、E. S. Dubrovskaya、S. G. Klochkov、P. N. Shevtsov、E. F. Shevtsova、S. O. Bachurin
DOI:10.1007/s11172-016-1582-x
日期:2016.9
Unknown conjugates of carbazoles and tetrahydrocarbazoles were obtained by the alkylation of carbazoles and tetrahydrocarbazoles with 3,6-substituted 9-oxiranylmethylcarbazoles. The influence of synthesized 1-(9Н-carbazol-9-yl)-3-(1,2,3,4-tetrahydro-5Н-pyrido[4,3-b]-indol-5-yl)propan-2-ones on functional characteristics of brain mitochondria has been studied. The potential neuroprotective activity
Molecular design of multitarget neuroprotectors 3. Synthesis and bioactivity of tetrahydrocarbazole—aminoadamantane conjugates
作者:V. B. Sokolov、A. Yu. Aksinenko、T. V. Goreva、T. A. Epishina、V. V. Grigor´ev、A. V. Gabrel´yan、D. V. Vinogradova、M. E. Neganova、E. F. Shevtsova、S. O. Bachurin
DOI:10.1007/s11172-016-1461-5
日期:2016.5
A synthetic approach to the design of new multitarget neuroprotectors consisting in combination of the tetrahydrocarbazole and aminoadamantane pharmacophore fragments through a 2-hydroxypropylene spacer upon the reaction of 9-oxiranylmethyl-2,3,4,9-tetrahydro-1H-carbazoles and aminoadamantanes, which affords 1-(adamantan-1-ylamino)-3-(1,2,3,4-tetrahydrocarbazol-9-yl)-propan-2-ols, is proposed. The effect of the synthesized compounds on the neuronal NMDA receptors and the functional characteristics of rat liver mitochondria was studied.