Silicon assisted diversified reaction of a β-silylmethylene malonate with dimethylsulfoxonium methylide
作者:Pintu K. Kundu、Rekha Singh、Sunil K. Ghosh
DOI:10.1016/j.jorganchem.2008.11.005
日期:2009.2
Reaction of dimethylsulfoxoniummethylide with a β-silylmethylene malonate gives diversified products, cyclopropane, cyclobutane or allyl and homoallyl silanes depending upon the stoichiometry of the reactants and reaction conditions. Contrary to this, reaction of a β-arylmethylene malonate gives only the cyclopropane product. The product(s) formed are unique and the silicon group played a crucial
Reactivity of spiroanthraceneoxazolidines with cyclopropanes: An approach to the oxindole alkaloid scaffold
作者:Evgeny M. Buev、Vladimir S. Moshkin、Vyacheslav Y. Sosnovskikh
DOI:10.1016/j.tetlet.2018.08.001
日期:2018.9
The reaction of N-methylspiro[anthracene-oxazolidine] with spiro[cyclopropane-3,3′-indolin]-2-ones in the presence of MgI2 formed the corresponding spiro[pyrrolidine-3,3′-indolin]-2-ones in 42–65% yields. The use of N-benzylspiro[anthracene-oxazolidine] in this reaction led to the formation of a mixture of the corresponding N-methyl- and N-benzylpyrrolidines.
Spiroanthraceneoxazolidine as a synthetic equivalent of methanimine in the reaction with donor–acceptor cyclopropanes. Synthesis of diethyl 5-arylpyrrolidine-3,3-dicarboxylates
作者:Evgeny M. Buev、Vladimir S. Moshkin、Vyacheslav Y. Sosnovskikh
DOI:10.1016/j.tetlet.2016.07.007
日期:2016.8
140–200 °C in the presence of magnesium bromide diethyl etherate to give 5-arylpyrrolidine-3,3-dicarboxylates. Yield and ease of the reaction were well correlated with the electron-donating nature of the aryl(heteroaryl) substituent at the cyclopropane ring. This one-pot domino reaction allows the formation of a number of functionalized arylpyrrolidines in 16–54% yields.
Stereospecific 1,3-Aminobromination of Donor-Acceptor Cyclopropanes
作者:Saikat Das、Constantin G. Daniliuc、Armido Studer
DOI:10.1002/anie.201704092
日期:2017.9.11
Sn(OTf)2-catalyzed 1,3-aminobromination of donor–acceptor cyclopropanes with various sulfonyl amides or electron-poor anilines and N-bromosuccinimide is reported. These experimentally straightforward reactions occurred with complete regio- and stereospecificity (for anilines) to give γ-aminated α-brominated malonic diesters in good to excellent yields (up to 98 %). These compounds served as valuable
Tetrahydroquinolines via Stereospecific [3 + 3]-Annulation of Donor–Acceptor Cyclopropanes with Nitrosoarenes
作者:Saikat Das、Shyamal Chakrabarty、Constantin G. Daniliuc、Armido Studer
DOI:10.1021/acs.orglett.6b01302
日期:2016.6.3
A stereospecific [3 + 3]-annulation of donor–acceptorcyclopropanes with nitrosoarenes under the influence of MgBr2 as a stoichiometric Lewisacid and reagent offers a novel approach to various structurally diverse C-8-brominated tetrahydroquinolines. In these cascades C–C, C–N, and C–Br bonds are formed. The reactions are easy to conduct and proceed under mild conditions, and the products can readily