Tricarbonyl(dihydroazepinyl)chromium complexes and methylenepyrrolidines from (2 '-dimethylaminoethenyl)carbenechromium complexes

Authors
Schirmer, H Labahn, T Flynn, B Wu, YT de Meijere, A
Citation
H. Schirmer et al., Tricarbonyl(dihydroazepinyl)chromium complexes and methylenepyrrolidines from (2 '-dimethylaminoethenyl)carbenechromium complexes, SYNLETT, (12), 1999, pp. 2004-2006
Citations number
37
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
SYNLETT
ISSN journal
09365214 → ACNP
Issue
12
Year of publication
1999
Pages
2004 - 2006
Database
ISI
SICI code
0936-5214(199912):12<2004:TCAMF>2.0.ZU;2-6
Abstract
The (3-amino-1-ethoxyalkenylidene)pentacarbonylchromium complexes 1 and 8 r eact with bulkily substituted terminal alkynes 2 and 9 in tetrahydrofuran t o give eta(5)-tricarbonyl(dihydro-azepinyl)chromium complexes 3 and 12a whi ch can be isolated in low yields. When the reactions are carried out in pyr idine, the formal [5+2] cycloaddition is favored, but the complexes of type 12 are immediately further transformed to 2-(isobutyrylmethylene)pyrrolidi nes 13 in good yields.