Výsledky vyhledávání - "Marina N. Protopopova"

Enhanced enantiocontrol in catalytic metal carbene transformations with dirhodium (II) tetrakis[methyl 2-oxooxazolidin-4(S)-carboxylate], Rh2(4S-MEOX)4

Autor: Stanley H. Simonsen, Alexey B. Dyatkin, Michael P. Doyle, Ratna Ghosh, Charla S. Miertschin, Chien I. Yang, William R. Winchester, Vincent M. Lynch, Marina N. Protopopova

Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 114:163-170

The synthesis, spectral characteristics, and X-ray structures for dirhodium(II) tetrakis[methyl 2-oxooxazolidin-4(S)-carboxylate], Rh2(4S-MEOX)4, and the related dirhodium(II) tetrakis[methyl 5(R)-methyl-2-oxooxazolidin-4(S)-carboxylate], Rh2(4S-THRE

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::752d50cd881f1ab3f9a9ce3f581689d7
https://doi.org/10.1002/recl.19951140407

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Stereocontrol in Intermolecular Dirhodium(II)-Catalyzed Carbonyl Ylide Formation and Reactions. Dioxolanes and Dihydrofurans

Autor: Keith R. Xavier, Melissa M. Vasbinder, Marina N. Protopopova, Michael P. Doyle, David C. Forbes, Sarah A. Stanley

Publikováno v: The Journal of Organic Chemistry. 62:7210-7215

Ethyl diazoacetate undergoes dirhodium(II)-catalyzed reactions with aryl aldehydes to form 1,3-dioxolanes as mixtures of diastereoisomers in good yields. Carbonyl ylides are reaction intermediates. Catalyst dependent diastereocontrol is observed for

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e5a5e327ff708ee48a8a29e32783db50
https://doi.org/10.1021/jo970641l

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Macrocycle Formation by Catalytic Intramolecular Cyclopropanation. A New General Methodology for the Synthesis of Macrolides

Autor: Doina G. Ene, Chad S. Peterson, Dann L. Parker, Vincent M Lynch, Michael P. Doyle, Alan B. Marnett, Marina N. Protopopova

Publikováno v: Journal of the American Chemical Society. 119:8826-8837

Catalytic intramolecular cyclopropanation by diazoacetates onto a remote carbon−carbon double bond resulting in the formation of 9- to 20-membered ring lactones is reported. When competition exists between proximal allylic and remote olefinic cyclo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c93fe92ed47497238facc8783909c27a
https://doi.org/10.1021/ja971687z

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Intramolecular Regioselective Insertion into Unactivated Prochiral Carbon−Hydrogen Bonds with Diazoacetates of Primary Alcohols Catalyzed by Chiral Dirhodium(II) Carboxamidates. Highly Enantioselective Total Synthesis of Natural Lignan Lactones

Autor: Marina N. Protopopova, Qi-Lin Zhou, Michael P. Doyle, Jeffrey W. Bode

Publikováno v: The Journal of Organic Chemistry. 61:9146-9155

Intramolecular insertion into unactivated prochiral C−H bonds of 3-aryl-1-propyl diazoacetates catalyzed by dirhodium(II) tetrakis[methyl 1-(3-phenyl propanoyl)imidazolidin-2-one-4(R or S)-carboxylate], Rh2(4R-MPPIM)4 or Rh2(4S-MPPIM)4, occurs in 9

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::855a9d3cf749e289b9ed01793018bd4e
https://doi.org/10.1021/jo961607u

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Enantioselective intramolecular cyclopropanation of N-allylic- and N-homoallylic diazoacetamides catalyzed by chiral dirhodium(II) catalysts

Autor: Marina N. Protopopova, Michail Y. Eismont, Michelle M. Y. Kwan, Michael P. Doyle

Publikováno v: Tetrahedron. 50:1665-1674

Diazodecomposition of N-(tert-butyl)-N-(3-buten-1-yl)diazoacetamides catalyzed by dirhodium(II) tetrakis[methyl 2-pyrrolidone-5(S)-carboxylate], Rh2(5S-MEPY)4, and tetrakis[methyl 2-oxazolidinone-4(S)-carboxylate], Rh2(4S-MEOX)4, forms products from

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4970ddc843db8b72c6853aeb49c17ec1
https://doi.org/10.1016/s0040-4020(01)80842-5

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Tetrakis[(4S)-4-phenyloxazolidin-2-one]dirhodium(II) and Its Catalytic Applications for Metal Carbene Transformations

Autor: Paul Müller, Michael P. Doyle, Marina N. Protopopova, Gérald Bernardinelli, Shahrokh Motallebi, Doina G. Ene, William R. Winchester

Publikováno v: Helvetica Chimica Acta, Vol. 76, No 6 (1993) pp. 2227-2235

The synthesis and X-ray structure of the binuclear complex tetrakis[(4S)-4-phenyloxazolidin-2-one]-dirhodium(II) ([Rh2{(4S)-phox}4]) are reported. Structure-selectivity comparisons are made for typical metal carbene transformations, such as inter- an

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6da20bb393ab2632ab5b89458fe4af15
https://doi.org/10.1002/hlca.19930760606

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Ligand effects on dirhodium(II) carbene reactivities. Highly effective switching between competitive carbenoid transformations

Autor: William R. Winchester, Michael P. Doyle, Mark A. Semones, David J. Austin, Alan T. Price, Andrea Tran, Albert Padwa, Marina N. Protopopova

Publikováno v: Journal of the American Chemical Society. 115:8669-8680

Carboxylate and carboxamide ligands of dirhodium(II) catalysts control chemoselectivity in competitive metal carbene transformations of diazo compounds. For competitive intramolecular cyclopropanation versus intramolecular aromatic substitution with

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::997a3e9ddf69b33253c250dda36e657e
https://doi.org/10.1021/ja00072a021

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