Unequivocal Synthesis of (Z)-Alkene and (E)-Fluoroalkene Dipeptide Isosteres To Probe Structural Requirements of the Peptide Transporter PEPT1
摘要:
Described is a novel synthetic route for dipeptide isosteres containing (Z)-alkene and (E)-fluoroalkene units as cis-amide bond equivalents via organocopper-mediated reduction of gamma-acetoxy- or gamma,gamma-difluoro-alpha,beta-unsaturated-delta-lactams. The synthesized isosteres were evaluated in terms of their affinities for the peptide transporter PEPT1. traps-Amide isosteres tended to possess higher affinities for PEPT1 as compared to the corresponding cis-amide bond equivalents.
Unequivocal Synthesis of (Z)-Alkene and (E)-Fluoroalkene Dipeptide Isosteres To Probe Structural Requirements of the Peptide Transporter PEPT1
摘要:
Described is a novel synthetic route for dipeptide isosteres containing (Z)-alkene and (E)-fluoroalkene units as cis-amide bond equivalents via organocopper-mediated reduction of gamma-acetoxy- or gamma,gamma-difluoro-alpha,beta-unsaturated-delta-lactams. The synthesized isosteres were evaluated in terms of their affinities for the peptide transporter PEPT1. traps-Amide isosteres tended to possess higher affinities for PEPT1 as compared to the corresponding cis-amide bond equivalents.
Enantiospecific Formation of 3,6-Dihydro-1<i>H</i>-pyridin-2-ones: Low-Pressure Palladium-Catalysed Decarboxylative Carbonylation of 3-Tosyl-5-vinyloxazolidin-2-ones
作者:Julian G. Knight、Iain M. Lawson、Christopher N. Johnson
DOI:10.1055/s-2005-924765
日期:——
Palladium-catalysed decarboxylative carbonylation of 3-tosyl-5-vinyloxazolidin-2-ones 5 occurs at atmospheric pressure to give 1-tosyl-3,6-dihydro-1H-pyridin-2-ones 6. The reaction proceeds with no loss of enantiopurity and detosylation with sodium naphthalenide gives the title compounds in good yields.
Diastereoselective synthesis of 3,6-disubstituted 3,6-dihydropyridin-2-ones
作者:Thomas F. Anderson、Julian G. Knight、Kirill Tchabanenko
DOI:10.1016/s0040-4039(02)02677-1
日期:2003.1
In a short sequence, 5-vinyloxazolidin-2-ones were converted into the 3,6-disubstituted 3,6-dihydropyridin-2-ones via Pd-catalysed carbonylation and enolate alkylation with high diastereoselectivity. Alkylation of 6-substituted N-methylpyridin-2-ones gives stereoselectively the 3,6-anti diastereoisomer with MeI, BuI and i-PrI. Alkylation of the corresponding N-BOC pyridinones gives the 3,6-syn diastereoisomer
New potential access to ethylenic pseudodipeptides through catalytic alkene metathesis
作者:Florence Garro-Hélion、François Guibé
DOI:10.1039/cc9960000641
日期:——
Dialkenenic amide 1 (R(1) = CH(2)Ph, R(2) = H) is readily converted, through ruthenium-catalysed metathetic ring closure, to ethylenic lactam 2, a close precursor of Z-ethylenic pseudodipeptide 3.
Enantioselective Synthesis of 3,6-Dihydro-1<i>H</i>-pyridin-2-ones: Unexpected Regioselectivity in the Palladium-Catalyzed Decarboxylative Carbonylation of 5-Vinyloxazolidin-2-ones
作者:Julian G. Knight、Simon W. Ainge、Andrew M. Harm、Simon J. Harwood、Haydn I. Maughan、Duncan R. Armour、David M. Hollinshead、Albert A. Jaxa-Chamiec