Diastereoselective synthesis of tetrasubstituted-octahydro-3,6-diazacarbazoles and tetrasubstituted-3,6-diazacarbazoles via double Pictet–Spengler reaction
摘要:
Pictet-Spengler condensation of 2,5-bis(2-phenyl-1-aminoethyl)pyrrole using glacial acetic acid afforded only one diastereomer of unreported tetrasubstituted-octahydro-3,6-diazacarbazoles. These were readily dehydrogenated to tetrasubstituted-3,6-diazacarbazoles. The stereoselectivity in the Pictet-Spengler reaction has been demonstrated using single crystal X-ray analysis. (C) 2011 Elsevier Ltd. All rights reserved.
Efficient Friedel–Crafts alkylation of indoles and pyrrole with enones and nitroalkene in water
作者:Najmedin Azizi、Fezzeh Arynasab、Mohammad R. Saidi
DOI:10.1039/b610263h
日期:——
An operationally simple and entirely green protocol for heteropoly acid (10 mg) catalyst conjugate addition of indoles and pyrrole to unsaturated carbonyl compounds and nitroalkene in water at ambient temperature in good to excellent yields has been developed.
Asymmetric Friedel–Crafts reaction of N-heterocycles and nitroalkenes catalyzed by imidazoline–aminophenol–Cu complex
作者:Naota Yokoyama、Takayoshi Arai
DOI:10.1039/b904275j
日期:——
Catalytic asymmetric FriedelâCrafts reaction of pyrrole with nitroalkenes was smoothly catalyzed by newly synthesized nitro-substituted imidazolineâaminophenol (1b)âCu complex to give the adduct with up to 92% ee.
Silica Gel, an Effective Catalyst for the Reaction of Electron-Deficient Nitro-Olefins with Nitrogen Heterocycles
作者:Abdullah M. A. Shumaila、Radhika S. Kusurkar
DOI:10.1080/00397910903340694
日期:2010.8.31
The reaction of electron-deficientolefins with nitrogen heterocycles such as pyrrole and indole was examined in the presence of silica gel at room temperature under stirring at solvent-free conditions. It was found that silica gel is an effective catalyst for this conjugate addition. This work resulted in the formation of monosubstituted pyrroles selectively as a major product except in a few cases
Conjugate addition of pyrroles to α,β-unsaturated ketones using copper bromide as a catalyst
作者:Radhika S. Kusurkar、Sandip K. Nayak、Neelam L. Chavan
DOI:10.1016/j.tetlet.2006.08.030
日期:2006.10
Copper bromide was used as a catalyst for the addition of pyrroles to enones. When both the reactants were used in equimolar amounts, mono and dialkylated products were obtained. However, the use of excess enone furnished only dialkylated products. Thus, copper bromide was shown to be an efficient catalyst for the dialkylation of pyrroles.
Friedel–Crafts reaction of electron-rich (het)arenes with nitroalkenes
作者:Mikhail N. Feofanov、Alexei D. Averin、Irina P. Beletskaya
DOI:10.1016/j.mencom.2019.03.005
日期:2019.3
The Friedel Crafts reaction between electron-rich (het)arenes and beta-nitrostyrenes under MgI2 or Ca(NTf2)(2) catalysis affords 1-(het)aryl-2-nitro-1-phenylethanes in yields up to 94%.