- Design, synthesis and biological evaluation of N-hydroxy-aminobenzyloxyarylamide analogues as novel selective κ opioid receptor antagonists
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Aminobenzyloxyarylamide derivatives 1a-i and 2a-t were designed and synthesized as novel selective κ opioid receptor (KOR) antagonists. The benzoyl amide moiety of LY2456302 was changed into N-hydroxybenzamide and benzisoxazole-3(2H)-one to investigate whether it could increase the binding affinity or selectivity for KOR. All target compounds were evaluated in radioligand binding assays for opioid receptor binding affinity. These efforts led to the identification of compound 1c (κ Ki = 179.9 nM), which exhibited high affinity for KOR. Moreover, the selectivity of KOR over MOR and DOR increased nearly 2-fold and 7-fold, respectively, compared with (±)LY2456302.
- He, Guangchao,Peng, Kewen,Song, Qiao,Wang, Junwei,Xu, Anhua,Xu, Yungen,Zhu, Qihua
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- Stereocomplementary Synthesis of Pharmaceutically Relevant Chiral 2-Aryl-Substituted Pyrrolidines Using Imine Reductases
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Exploring a collection of naturally occurring imine reductases (IREDs) identified two stereocomplementary IREDs with reducing activity toward sterically hindered 2-aryl-substituted pyrrolines. Using (R)-selective ScIR and (S)-selective SvIR, various chiral 2-aryl-substituted pyrrolidines with excellent enantioselectivity (>99% ee) were stereocomplementarily synthesized in good yield (60-80%), demonstrating the feasibility of IREDs for generating pharmaceutically relevant chiral 2-aryl-substituted pyrrolidine intermediates.
- Chen, Fei-Fei,Chen, Qi,Li, Bo-Bo,Xu, Jian-He,Zhang, Yu-Hui,Zheng, Gao-Wei,Zhou, Xin-Yi
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supporting information
p. 3367 - 3372
(2020/04/21)
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- Direct α-C-H bond functionalization of unprotected cyclic amines
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Cyclic amines are ubiquitous core structures of bioactive natural products and pharmaceutical drugs. Although the site-selective abstraction of C-H bonds is an attractive strategy for preparing valuable functionalized amines from their readily available parent heterocycles, this approach has largely been limited to substrates that require protection of the amine nitrogen atom. In addition, most methods rely on transition metals and are incompatible with the presence of amine N-H bonds. Here we introduce a protecting-group-free approach for the α-functionalization of cyclic secondary amines. An operationally simple one-pot procedure generates products via a process that involves intermolecular hydride transfer to generate an imine intermediate that is subsequently captured by a nucleophile, such as an alkyl or aryl lithium compound. Reactions are regioselective and stereospecific and enable the rapid preparation of bioactive amines, as exemplified by the facile synthesis of anabasine and (-)-solenopsin A.
- Chen, Weijie,Ma, Longle,Paul, Anirudra,Seidel, Daniel
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p. 165 - 169
(2018/02/06)
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- Hammett correlation of nornicotine analogues in the aqueous aldol reaction: Implications for green organocatalysis
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(Chemical Equation Presented) A series of meta- and para-substituted 2-arylpyrrolidines were synthesized and examined for their ability to catalyze an aqueous aldol reaction under buffered conditions. Kinetic analysis of arylpyrrolidine-catalyzed reactions displayed a linear Hammett correlation with ρ = 1.14 (R2 = 0.996), indicating that the reaction is accelerated by electron-withdrawing aryl rings. These results show promise for the development of a synthetically viable aqueous organocatalyst.
- Rogers, Claude J.,Dickerson, Tobin J.,Brogan, Andrew P.,Janda, Kim D.
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p. 3705 - 3708
(2007/10/03)
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- The base-induced fragmentation of N,N-dibenzyl-N'-aryltriazenes
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Deprotonation of N,N-dibenzyl-N'-aryltriazenes, either in liquid phase or on solid support, by a strong base (n-BuLi or LDA) leads to fragmentation of the N-N single bond to give an imine and a diazenyl anion, which decomposes by loss of nitrogen to the parent aryl anion. The imine is deprotonated to give a 2-aza allyl anion, which is subsequently trapped by electrophiles. As an overall result, this fragmentation of the T1 triazene anchoring group represents a new traceless cleavage mode of this linker. The same mode of fragmentation was observed for the T2 linker leading to 2-aza allyl anions in liquid phase. The dibenzylamino moiety is apparently crucial since pyrrolidinodiazenylarenes can be metallated at the heterocycle without cleavage.
- Lormann, Matthias E. P.,Dahmen, Stefan,Avemaria, Frank,Lauterwasser, Frank,Bra?se, Stefan
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p. 915 - 918
(2007/10/03)
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- Folate Antagonists. 18. Synthesis and Antimalarial Effects of N6-(Arylmethyl)-N6-methyl-2,4,6-pteridinetriamines and Related N6,N6-Disubstituted 2,4,6-Pteridinetriamines
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N6-(Arylmethyl)-N6-methyl-2,4,6-pteridinetriamines (1-5) and related N6-substituted 2,4,6-pteridinetriamines (16-20) were obtained by the condensation of 6-chloro-2,4-pteridinediamine with methylarylmethanamine and other selected secondary amines.The requisite N-methylarylmethanamines (21-32) were prepared by the hydrogenation over Pt/C of the corresponding arylcarboxaldehyde in the presence of methanamine.Several of the N6-(arylmethyl)-N6-methyl-2,4,6-pteridinetriamines exhibited exceptional suppressive antimalarial activity against a drug-sensitive line of Plasmodium berghei in mice.N6-Methyl-N6-(1-naphthalenylmethyl)-2,4,6-pteridinetriamine (9), the most active of those compounds, was also shown to be curative at 3.16 mg/kg in a single oral dose against P. cynomolgi in the rhesus monkey.This compound was also shown to be effective against a chloroquine-resistant line of P. berghei in the mouse but showed cross-resistance to a pyrimethamine-resistant strain.Most of the 2,4,6-pteridinetriamines showed strong antibacterial action against Streptococcus faecalis and Staphylococcus aureus.
- Elslager, Edward F.,Johnson, Judith L.,Werbel, Leslie M.
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p. 140 - 145
(2007/10/02)
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