Cyclopropanation of 2-arylmethylidenemalononitriles, alkyl 3-aryl-2-cyanoprop-2-enoates, and N-substituted 3-aryl-2-cyanoprop-2-enamides with bromine-containing zinc enolates
作者:V. V. Shchepin、Yu. G. Stepanyan、P. S. Silaichev、M. A. Ezhikova、M. I. Kodess
DOI:10.1134/s1070428007070111
日期:2007.7
Zinc enolates derived from 2,2-dibromoindan-1-one and 2,2-dibromo-1,2,3,4-tetrahydronaphthalen-1-one reacted with 2-arylmethylidenemalononitriles, alkyl 3-aryl-2-cyanoprop-2-enoates, and N-substituted 3-aryl-2-cyanoprop-2-enamides to give, respectively, 3-aryl-1'-oxo-1',3'-dihydrospiro[cyclopropane-1,2'-indene]-2-2-dicarbonitriles, 3-aryl-1'-oxo-3',4'-dihydro-1'H-spiro[cyclopropane-1,2'-naphthalene]-2,2-dicarbonitriles, alkyl 3-aryl-2-cyano-1'-oxo-1',3'-dihydrospiro[cyclopropane-1,2'-indene]-2-carboxylates, alkyl 3-aryl-2-cyano-1'-oxo-3',4'-dihydro-1'H-spiro[cyclopropane-1,2'-naphthalene]-2-carboxylates, and N-substituted 3-aryl-2-cyanol-1'-oxo-3',4'-dihydro-1'H-spiro[cyclopropane-1,2'-naphthalene]-2-carboxamides as a single diastereoisomer. The stereoconfiguration of the products was determined by H-1 and C-13 NMR spectroscopy.