Biaryl Formation from 5-(2-Bromobenzyl)-Substituted Piperidin-2-ones via Palladacycles
摘要:
The reaction of piperdin-2-ones with a 2-bromobenzyl substituent in the 5-position in the presence of a palladium catalyst leads to biaryl compounds. Their formation can be explained via initial C-H insertion of the aryl palladium species into the allylic C-H bond of the piperidinone. This eventually leads to a metallacycle containing Pd(II) that inserts another aryl bromide, promoting the formation of the biaryl bond.
Synthesis of 1,5-methano-3-benzazocines by intramolecular Buchwald–Hartwig arylation of 2-piperidinones
作者:Gedu Satyanarayana、Martin E. Maier
DOI:10.1016/j.tet.2007.10.088
日期:2008.1
based on an intramolecular Buchwald–Hartwig arylation was developed. The reaction required the use of the zinc enolate of the piperidinone substrates. These substrates, piperidin-2-ones with a 2-bromobenzyl substituent in the 5-position were prepared by reductive amination of 4-formyl esters. The latter could be obtained via Michael addition of enamines, derived from 3-arylpropanals, to ethyl acrylate
Biaryl Formation from 5-(2-Bromobenzyl)-Substituted Piperidin-2-ones via Palladacycles
作者:Gedu Satyanarayana、Martin E. Maier
DOI:10.1021/ol800330d
日期:2008.6.1
The reaction of piperdin-2-ones with a 2-bromobenzyl substituent in the 5-position in the presence of a palladium catalyst leads to biaryl compounds. Their formation can be explained via initial C-H insertion of the aryl palladium species into the allylic C-H bond of the piperidinone. This eventually leads to a metallacycle containing Pd(II) that inserts another aryl bromide, promoting the formation of the biaryl bond.