Format:
Online Resource (258 Bl., 3.392 KB)
Content:
!106417266! Under the optimized conditions, a wide range of ß-Aminosubstituted a,ß-unsaturated Fischer carbene complexes were easily prepared in a four-step one-pot operation. Reaction of Fischer carbene complexes with alkynes affords versatile adducts, from which complicated skeletons of natural product analogues and interesting molecules are accessible. Tricyclic adducts with highly regio- and diastereoselectivity were prepared in 15-91% yields by the reaction of pentacarbonyl[(2E)-3-cyclohexenyl-3-dimethylamino-1-ethoxy-2-propen-1-yliden]chromium, or its tungsten analogues, with alkynes. The mechanism and limitations of the formation of tricyclic adducts and their unusual photophysical properties were studied in detail. The formal [3+2] cycloadditions of Fischer carbene complexes with different alkynes, including diynes and enynes, performed in pyridine afforded highly substituted 5-dimethylamino-3-ethoxy-cyclopentadienes (sometimes also their regioisomers), generally in medium to good yields
Note:
Göttingen, Univ., Diss., 2003
Language:
German
Keywords:
Hochschulschrift
URN:
urn:nbn:de:gbv:7-webdoc-142-4
