(ω-Ammonioalkyl)cyclopentadienides by Rhodium-Catalyzed Vinylcarbene Transfer to Semicyclic Enaminocarbonyl Compounds
作者:Gerhard Maas、Andreas Müller
DOI:10.1021/ol990546u
日期:1999.7.1
The rhodium(ll) catalyzed reaction of vinyldiazoacetate 2 with semicyclic beta-enaminocarbonyl compounds 1 provides (omega-(methylammonio)-alkyl)cyclopentadienides 3. This transformation represents a novel reaction cascade which combines carbenoid addition at a C=C bond with ring chain transformation. In some cases, products resulting from vinylcarbene insertion into the enaminic C-H bond of 1 are also isolated, These dienamines undergo subsequent isomerization to furnish betaines 3.
Synthesis of Semicyclic/Exocyclic Amino-1,3-dienes by organocuprate addition to semicyclic propyniminium salts