Monofluoro-substituted azomethine ylides in fluorocarbene reactions with imines. Synthesis and transformations of monofluoroaziridines
摘要:
N-Arylmethylene and N-benzhydrylideneamines react with fluorocarbene yielding fluoro-substituted azomethine ylides that undergo 1,3-pi-cyclization into aziridines. Generation of fluoroylides in the presence of dipolarophiles (dimethyl maleate or dirnethyl acetylenedicarboxylate) led to the reaction of 1,3-dipolar cycloaddition resulting in substituted 2-pyrrolines or pyrroles. 2-Fluoroaziridines, products of N-alkyl-N-benzhydrylideneamines 1,3-pi-cyclization, in the presence of acid catalysts suffer isomerization into alpha-fluoroimines and 1,3-disubstituted indoles.
Fluoroaziridines as novel substrates in the modified Petasis reaction: synthesis of monofluorinated propargyl amines
作者:Alexander S. Konev、Sara Stas、Mikhail S. Novikov、Alexander F. Khlebnikov、Kourosch Abbaspour Tehrani
DOI:10.1016/j.tet.2007.10.067
日期:2008.1
Reaction of 2-fluoroaziridines with potassium alkynyltrifluoroborates in the presence of BF3·OEt2 leads to fluorinated propargyl amines in moderate to good yields. The reaction proceeds as an in situ isomerization of 2-fluoroaziridines to α-fluorinated imines, followed by the reaction of the imine with alkynyldifluoroborane, which is generated in situ from the potassium alkynyltrifluoroborates and
The first example of the generation of azomethine ylides from a fluorocarbene: 1,3-cyclization and 1,3-dipolar cycloaddition
作者:Alexander S. Konev、Mikhail S. Novikov、Alexander F. Khlebnikov
DOI:10.1016/j.tetlet.2005.09.165
日期:2005.11
or dimethyl acetylenedicarboxylate, the products of dehydrofluorination of the primary adducts of the 1,3-dipolarcycloaddition of fluoro-substituted azomethine ylides to multiple bonds of dipolarophiles were obtained. In the case of the reaction of N-alkylimines of benzaldehyde the cycloaddition of ylides to dimethyl maleate completely suppressed the cyclization to aziridines.
A simple route to side-chain fluorinated β-lactams from ring-fluorinated aziridines
作者:Alexander S. Konev、Mikhail S. Novikov、Alexander F. Khlebnikov、Kourosch Abbaspour Tehrani
DOI:10.1016/j.jfluchem.2006.10.013
日期:2007.2
beta-Lactams bearing a Ph2CF substituent at the C(4)-atorn were synthesized from N-alkyl-2-fluoro-3,3-diphenylaziridines. The transformation was realized using SbF3-mediated isomerization of the monofluoroaziridines to fluorinated aldimines, followed by Staudinger reaction with ketenes. It was shown that this reaction sequence can be performed as a one-pot procedure. (c) 2006 Elsevier B.V. All rights reserved.
Monofluoro-substituted azomethine ylides in fluorocarbene reactions with imines. Synthesis and transformations of monofluoroaziridines
作者:A. S. Konev、M. S. Novikov、A. F. Khlebnikov
DOI:10.1134/s1070428007020224
日期:2007.2
N-Arylmethylene and N-benzhydrylideneamines react with fluorocarbene yielding fluoro-substituted azomethine ylides that undergo 1,3-pi-cyclization into aziridines. Generation of fluoroylides in the presence of dipolarophiles (dimethyl maleate or dirnethyl acetylenedicarboxylate) led to the reaction of 1,3-dipolar cycloaddition resulting in substituted 2-pyrrolines or pyrroles. 2-Fluoroaziridines, products of N-alkyl-N-benzhydrylideneamines 1,3-pi-cyclization, in the presence of acid catalysts suffer isomerization into alpha-fluoroimines and 1,3-disubstituted indoles.