138775-49-2Relevant articles and documents
Optimized Opioid-Neurotensin Multitarget Peptides: From Design to Structure-Activity Relationship Studies
Gonzalez, Simon,Dumitrascuta, Maria,Eiselt, Emilie,Louis, Stevany,Kunze, Linda,Blasiol, Annalisa,Vivancos, Mélanie,Previti, Santo,Dewolf, Elke,Martin, Charlotte,Tourwé, Dirk,Cavelier, Florine,Gendron, Louis,Sarret, Philippe,Spetea, Mariana,Ballet, Steven
, p. 12929 - 12941 (2020/12/17)
Fusion of nonopioid pharmacophores, such as neurotensin, with opioid ligands represents an attractive approach for pain treatment. Herein, the μ-/δ-opioid agonist tetrapeptide H-Dmt-d-Arg-Aba-β-Ala-NH2(KGOP01) was fused to NT(8-13) analogues. Since the NTS1 receptor has been linked to adverse effects, selective MOR-NTS2 ligands are preferred. Modifications were introduced within the native NT sequence, particularly a β3-homo amino acid in position 8 and Tyr11substitutions. Combination of β3hArg and Dmt led to peptide 7, a MOR agonist, showing the highest NTS2 affinity described to date (Ki= 3 pM) and good NTS1 affinity (Ki= 4 nM), providing a >1300-fold NTS2 selectivity. The (6-OH)Tic-containing analogue 9 also exhibited high NTS2 affinity (Ki= 1.7 nM), with low NTS1 affinity (Ki= 4.7 μM), resulting in an excellent NTS2 selectivity (>2700). In mice, hybrid 7 produced significant and prolonged antinociception (up to 8 h), as compared to the KGOP01 opioid parent compound.
Synthesis of (-)-quinocarcin by directed condensation of α-amino aldehydes
Kwon, Soojin,Myers, Andrew G.
, p. 16796 - 16797 (2007/10/03)
An enantioselective synthesis of the natural antiproliferative agent quinocarcin was achieved by the directed condensation of optically active α-amino aldehyde intermediates. Condensation of the N-protected α-amino aldehyde 1, prepared in eight steps (19% yield) from (R,R)-pseudoephedrine glycinamide, with the C-protected α-amino aldehyde derivative 2, prepared in seven steps (34% yield) from (R,R)-pseudoephedrine glycinamide, afforded the corresponding imine in quantitative yield. Without isolation, direct treatment of this imine intermediate with 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) and hydrogen cyanide led to cleavage of the fluorenylmethoxycarbonyl (Fmoc) protective group followed by addition of cyanide (Strecker reaction) to form the bis-amino nitriles 3 as a mixture of diastereomers, in 91% yield. Treatment of the diastereomers 3 with trimethylsilyl cyanide and zinc chloride in 2,2,2-trifluoroethanol at 60 °C led to stepwise cyclization to form the tetracyclic product 4 (42% yield from 1 and 2). The latter intermediate was transformed into (-)-quinocarcin (1) in five steps (45% yield). The yield of quinocarcin was 19% from 1 and 2 (7 steps), and 4% from pseudoephedrine glycinamide (15 steps). Copyright