Synthesis of a DOTA (Gd3+)-conjugate of proton-pump inhibitor pantoprazole for gastric wall imaging studies
摘要:
Magnetic resonance imaging (MRI) is used to evaluate gastrointestinal (GI) structure and functions in humans. Despite filling the viscus lumen with a contrast agent, visualization of the viscus wall is limited. To overcome this limitation, we de novo synthesized a conjugate that covalently combines a Gd-based MRI contrast agent, encaged with a chelating agent (DOTA), with pantoprazole, which is a widely used proton pump inhibitor that binds to proton pumps in the stomach and colon. The DOTA linkage was installed at a mechanism-based strategic location in the pantoprazole molecule to minimize a possible negative effect of the structural modification on the drug. It is anticipated that by defining the wall of the stomach and colon, this compound will facilitate functional MRI of the GI tract in humans. (C) 2012 Elsevier Ltd. All rights reserved.
The present invention is directed towards novel compounds that are effective inhibitors of integrins, particularly &agr;IIb&bgr;3 or &agr;v integrins such as &agr;v&bgr;3 and &agr;v&bgr;5. One embodiment of the present invention comprises a compound of formula (I) or formula (II) or a pharmaceutically acceptable salt, solvate, or metabolic precursor thereof. R1, R2, R3, and R4 are defined herein.
Nickel-Catalyzed <i>C</i>-Alkylation of Nitroalkanes with Unactivated Alkyl Iodides
作者:Sina Rezazadeh、Vijayarajan Devannah、Donald A. Watson
DOI:10.1021/jacs.7b04312
日期:2017.6.21
Enabled by nickel catalysis, a mild and general catalytic method for C-alkylation of nitroalkanes with unactivatedalkyliodides is described. Compatible with primary, secondary, and tertiary alkyliodides; and tolerant of a wide range of functional groups, this method allows rapid access to diverse nitroalkanes.
Rapid Assembly of Saturated Nitrogen Heterocycles in One-Pot: Diazo-Heterocycle “Stitching” by N-H Insertion and Cyclization
作者:Alexander J. Boddy、Dominic P. Affron、Christopher J. Cordier、Emma L. Rivers、Alan C. Spivey、James A. Bull
DOI:10.1002/anie.201812925
日期:2019.1.28
Methods that providerapidaccess to new heterocyclic structures in biologically relevant chemical space provide important opportunities in drug discovery. Here, a strategy is described for the preparation of 2,2‐disubstituted azetidines, pyrrolidines, piperidines, and azepanes bearing ester and diverse aryl substituents. A one‐pot rhodium catalyzed N–H insertion and cyclization sequence uses diazo