Phenylquinoxalinone CFTR activator as potential prosecretory therapy for constipation
摘要:
Constipation is a common condition for which current treatments can have limited efficacy. By high-throughput screening, we recently identified a phenylquinoxalinone activator of the cystic fibrosis transmembrane conductance regulator (CFTR) chloride channel that stimulated intestinal fluid secretion and normalized stool output in a mouse model of opioid-induced constipation. Here, we report phenylquinoxalinone structure-activity analysis, mechanism of action, animal efficacy data in acute and chronic models of constipation, and functional data in ex vivo primary cultured human enterocytes. Structure-activity analysis was done on 175 phenylquinoxalinone analogs, including 15 synthesized compounds. The most potent compound, CFTRact-J027, activated CFTR with EC50 similar to 200 nM, with patch-clamp analysis showing a linear CFTR current-voltage relationship with direct CFTR activation. CFTRact-J027 corrected reduced stool output and hydration in a mouse model of acute constipation produced by scopolamine and in a chronically constipated mouse strain (C3H/HeJ). Direct comparison with the approved prosecretory. drugs lubiprostone and linaclotide showed substantially greater intestinal fluid secretion with CFTRact-J027, as well as greater efficacy in a constipation model. As evidence to support efficacy in human constipation, CFTRact-J027 increased transepithelial fluid transport in enteroids generated from normal human small intestine. Also, CFTRact-J027 was rapidly metabolized in vitro in human hepatic microsomes, suggesting minimal systemic exposure upon oral administration. These data establish structure-activity and mechanistic data for phenylquinoxalinone CFTR activators, and support their potential efficacy in human constipation.
Selective reduction of aromatic nitro compounds containing o- and n-benzyl groups with hydrazine and raney nickel
作者:Francisco Yuste、Manuel Saldaña、Fernando Walls
DOI:10.1016/s0040-4039(00)86770-2
日期:1982.1
The selectiity in the catalytic reduction of aromatic nitro compounds containing O-benzyl, N-benzyl or chlorine with hydrazine and Raneynickel was studied.
研究了用肼和阮内镍催化还原含O-苄基,N-苄基或氯的芳族硝基化合物的选择性。
“All-water” one-pot diverse synthesis of 1,2-disubstituted benzimidazoles: hydrogen bond driven ‘synergistic electrophile–nucleophile dual activation’ by water
作者:Damodara N. Kommi、Pradeep S. Jadhavar、Dinesh Kumar、Asit K. Chakraborti
DOI:10.1039/c3gc37004f
日期:——
promoting the subsequent nitro reduction and in the final cyclocondensation steps. The role of water in promoting the cyclocondensation reaction through hydrogen bonds is realized by the differential product yields during the reaction of mono-N-phenyl-o-phenylenediamine with benzaldehyde performed separately in water and D2O. The better hydrogen bond donor and hydrogen bond acceptor abilities of water
The invention relates to a method for preventing or treating a disease or disorder that is associated with the MrgX2 receptor. The invention also relates to MrgX2 antagonists and physiologically acceptable salts thereof. The invention also relates to pharmaceutical compositions and dosage forms comprising an MrgX2 antagonist.
Construction of Druglike 2-Amido Benzo[<i>d</i>]imidazole Analogues via Desulfurative Cyclization of Thiourea Intermediate Resin on Solid-Phase
作者:Hyun-Jeong Ryu、Seung-Ju Yang、Gee-Hyung Lee、Young-Dae Gong
DOI:10.1021/acscombsci.8b00004
日期:2018.5.14
A 2-amido benzo[d]imidazole library has been constructed by solid-phase synthesis. The key step of this solid-phase synthesis involves the preparation of polymer-bound 2-amino benzo[d]imidazole resin through desulfurative cyclization of thiourea resin using 2-chloro-1,3-dimethylimidazolinium chloride and N,N-diisopropylethylamine in dichloromethane (DCM), and the resin is then functionalized by acylation
通过固相合成已经构建了2-氨基苯并[ d ]咪唑文库。该固相合成的关键步骤涉及使用2-氯-1,3-二甲基咪唑啉鎓氯化物和N,N-二异丙基乙胺的二氯甲烷溶液,通过硫脲树脂的脱硫环化反应,制备与聚合物结合的2-氨基苯并[ d ]咪唑树脂。 (DCM),然后通过在2-胺位置上进行酰化将树脂官能化,得到2-酰胺基苯并[ d ]咪唑树脂。在具有p -I或m -NO 2的2-酰胺基苯并[ d ]咪唑树脂的情况下,通过Suzuki / Sonogashira-偶联将树脂进一步官能化(p -I)还原为伯胺(m -NO 2),然后进行酰化。最后,通过用三氟乙酸和DCM的混合物处理,将官能化的2-酰胺基-苯并[ d ]咪唑树脂从聚合物载体上裂解下来。结果,我们以高收率和良好的纯度获得了2-酰胺基苯并[ d ]咪唑类似物。
Regioselective Nitration of <i>N</i>-Alkyl Anilines using <i>tert</i>-Butyl Nitrite under Mild Condition
Regioselective ring nitration of N-alkyl anilines is reported using tert-butyl nitrite. The reactions proceed efficiently with a wide range of substrates providing synthetically useful N-nitroso N-alkyl nitroanilines in excellent yields which can be easily converted into N-alkyl phenylenediamines and N-alkyl nitroanilines using Zn-AcOH and HCl/MeOH, respectively.