Rapid Synthesis of Boc-2′,6′-dimethyl-l-tyrosine and Derivatives and Incorporation into Opioid Peptidomimetics
摘要:
The unnatural amino acid 2',6'-dimethyl-L-tyrosine has found widespread use in the development of synthetic opioid ligands. Opioids featuring this residue at the N-terminus often display superior potency at one or more of the opioid receptor types, but the availability of the compound is hampered by its cost and difficult synthesis. We report here a short, three-step synthesis of Boc-2',6'-dimethyl-L-tyrosine (3a) utilizing a microwave-assisted Negishi coupling for the key carbon-carbon bond forming step, and employ this chemistry for the expedient synthesis of other unnatural tyrosine derivatives. Three of these derivatives (3c, 3d, 30 have not previously been examined as Tyr(1) replacements in opioid ligands. We describe the incorporation of these tyrosine derivatives in a series of opioid peptidomimetics employing our previously reported tetrahydroquinoline (THQ) scaffold, and the binding and relative efficacy of each of the analogues at the three opioid receptor subtypes: mu (MOR), delta (DOR), and kappa (KOR).
Indole derivatives for the treatment of depression and anxiety
申请人:——
公开号:US20040006229A1
公开(公告)日:2004-01-08
The present invention provides compounds of formula (I): which are useful for treating depression, anxiety, and alleviating the symptoms caused by withdrawal or partial withdrawal from the use of tobacco or of nicotine.
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Dipeptide-Based Phosphonium Salt Catalysis: Application to Enantioselective Synthesis of Fused Tri- and Tetrasubstituted Aziridines
作者:Jia-Hong Wu、Jianke Pan、Tianli Wang
DOI:10.1055/s-0039-1690192
日期:2019.12
salt catalysis. This article briefly discusses the recent development in asymmetricreactions (mainly including nucleophilic additions and cyclizations) promoted by chiral quaternary phosphonium salt catalysts. We expect that more catalyticasymmetricreactions will be developed on the basis of such new phase-transfer catalytic systems in the near future.
Use of polycyclic thiazole systems for the treatment of obesity
申请人:AventisPharma Deutschland GmbH
公开号:US06329407B1
公开(公告)日:2001-12-11
The invention relates to the use of polycyclic thiazole systems and their physiologically tolerated salts and physiologically functional derivatives for the treatment of obesity.
The treatment involves administration of a compound of formula I,
in which the radicals have the stated meanings, and of their physiologically tolerated salts and physiologically functional derivatives.
Chiral Phosphoric Acid Catalyzed Enantioselective Synthesis of α-Tertiary Amino Ketones from Sulfonium Ylides
作者:Wengang Guo、Yuzheng Luo、Herman H.-Y. Sung、Ian D. Williams、Pingfan Li、Jianwei Sun
DOI:10.1021/jacs.0c07210
日期:2020.8.19
approach for the synthesis of chiral α-amino ketones, which is particularly useful for the less accessible acyclic α-tertiary cases. By a protonation-amination sequence, our approach represents a rare asymmetric H-heteroatom bond insertion by α-carbonyl sulfonium ylides, an attractive surrogate of diazocarbonyls. The mild intermolecular C-N bond formation was catalyzed by chiral phosphoric acids with excellent
Polycyclic thiazole systems, processes for their preparation and pharmaceuticals comprising these compounds
申请人:Aventis Pharma Deutschland GmbH
公开号:US06187801B1
公开(公告)日:2001-02-13
The invention relates to polycyclic thiazole systems and their physiologically tolerated salts and physiologically functional derivatives.
Compounds of the formula I,
in which the radicals have the stated meanings, and their physiologically tolerated salts and processes for their preparation are described. The compounds are suitable, for example, as anorectics.