Application of Peptidyl Radicals into a New Radical Cascade Leading to Unsaturated γ-Lactams
摘要:
Radical cyclization of dipeptides 1a-h proceeds smoothly to give five- and seven-membered rings in good to moderate total yields using Stork's catalytic tin hydride method. A radical is generated on a protecting group and translocated to the peptide moiety. Following a cyclization reaction, the vinyl radical can abstract hydrogen from a benzyl group on an amine, which results in elimination of the protected amine group. Encouraging results have notably been obtained with amino acids other than glycine.
Application of Peptidyl Radicals into a New Radical Cascade Leading to Unsaturated γ-Lactams
摘要:
Radical cyclization of dipeptides 1a-h proceeds smoothly to give five- and seven-membered rings in good to moderate total yields using Stork's catalytic tin hydride method. A radical is generated on a protecting group and translocated to the peptide moiety. Following a cyclization reaction, the vinyl radical can abstract hydrogen from a benzyl group on an amine, which results in elimination of the protected amine group. Encouraging results have notably been obtained with amino acids other than glycine.
Synthesis of Optically Active Condensed Tetrahydropyridines from α-Amino Esters
作者:Jürgen Liebscher、Heike Faltz、Christoph Bender
DOI:10.1055/s-2006-950192
日期:2006.9
condensed dihydropyridones 6 could be synthesized from a-amino esters 2 or 3 and o-bromobenzyl bromides or heterocyclic analogues 1. These products resemble isoquinoline and β-carboline alkaloid structures and could be stereoselectively transformed into condensed 4-hydroxytetrahydropyridines 7 and 8 by reaction with Grignard reagents or reduction. Treatment of condensed 4-allyl or 4-homoallyl-4-hydroxypyridines
Radical cyclization of dipeptides 1a-h proceeds smoothly to give five- and seven-membered rings in good to moderate total yields using Stork's catalytic tin hydride method. A radical is generated on a protecting group and translocated to the peptide moiety. Following a cyclization reaction, the vinyl radical can abstract hydrogen from a benzyl group on an amine, which results in elimination of the protected amine group. Encouraging results have notably been obtained with amino acids other than glycine.