Regio- and stereoselectivity of cycloaddition of C-amidonitrones to esters of methylenecyclopropanedicarboxylic acids
摘要:
C-Amidonitrones add regio- and stereoselectively to esters of 3-methylenecyclopropane-1,2-dicarboxylic, 2-(diphenylmethylene)cyclopropane-1,1-dicarboxylic, and 2-(1-phenylethylidene)cyclopropane-1,1-dicarboxylic acids to form a single diastereomer of 4-spirocyclopropaneisoxazolidines.
Diastereoselective 1,3-dipolar cycloaddition of C,N-diaryl- and C-amido-N-arylnitrones to arylpropenones
作者:A. P. Molchanov、T. Q. Tran、R. R. Kostikov
DOI:10.1007/s11172-012-0122-6
日期:2012.4
C,N-diarylnitrones and C-amido-N-arylnitrones add diastereoselectively to the substituted arylpropenones to give the substituted isoxazolidine possessing 3RS,4SR,5SR configuration. Replacement of the aryl groups either in the position 3 of chalcone or at the nitrogen atom of nitrone by the methyl group decreased the rate of cycloaddition.
1,3-Dipolar cycloaddition of N-allyl substituted polycyclic derivatives of isoindole-1,3-dione with nitrones and nitrile oxides: An experimental and theoretical investigation
作者:Mariia M. Efremova、Alexander P. Molchanov、Alexander S. Novikov、Galina L. Starova、Anna A. Muryleva、Alexander V. Slita、Vladimir V. Zarubaev
DOI:10.1016/j.tet.2020.131104
日期:2020.4
Cycloaddition reactions of N-allyl substituted polycyclic derivatives of isoindole-1,3-dione with nitrones proceeds regio- and stereoselectively on the double bond of the N-allyl substituent giving substituted isoxazolidines with good yields. Regioselectivity of the cycloaddition of this dipolarophiles with nitrile oxides depends on the structure of unsaturated hydrocarbon scaffold and the reaction
Regioselective cycloaddition of C-aryl- and C-carbamoylnitrones to methyl 2-benzylidenecyclopropanecarboxylate
作者:A. P. Molchanov、T. Q. Tran
DOI:10.1134/s1070428012100041
日期:2012.10
C-Aryl- and C-carbamoylnitrones reacted with methyl 2-benzylidenecyclopropanecarboxylate in highly regioselective fashion to give the corresponding 1,3-dipolar cycloaddition products, substituted methyl 5-oxa-6-azaspiro[2.4]heptane-1-carboxylates as mixtures of two diastereoisomers.
An efficient and stereoselective cycloaddition of C-aryl and C-amido nitrones to dimethyl 2-benzylidenecyclopropane-1,1-dicarboxylate
作者:Tung Q. Tran、Vyacheslav V. Diev、Alexander P. Molchanov
DOI:10.1016/j.tet.2011.02.013
日期:2011.4
1,3-Dipolar cycloalditions of dimethyl 2-benzylidenecyclopropane-1,1-dicarboxylate and a number of C-aryl or C-amido nitrones proceed with high efficiency and selectivity with the formation of only one isomeric spiral[cyclopropane-1,4-isoxazolidine] cycloadduct. (C) 2011 Elsevier Ltd. All rights reserved.
Regio- and stereoselective cycloaddition of C-Carbamoylnitrones to 1-benzylidene-3,3-dichloro-2,2-dimethylcyclopropane
作者:A. P. Molchanov、T. Q. Tran
DOI:10.1007/s10593-013-1271-8
日期:2013.6
C-Carbamoylnitrones add regio- and stereoselectively to 1-benzylidene-3,3-dichloro-2,2-dimethyl-cyclopropane with the formation of one diastereomer of 4-spirocyclopropaneisoxazolidine.