Triplet phenacylimidazoliums-catalyzed photocycloaddition of 1,4-dihydropyridines: An experimental and theoretical study
摘要:
The photocycloadditions of 1,4-dihydropyridines (DHPs) were achieved by using phenacylimidazoliums (Plms) as photosensitizers. Irradiation of DHPs 3a-g in the presence of Plms 1a-e and 2 performed an efficient formation of 3,9-diazatetraasteranes in shorter times under a lower power lamp. The mechanism of photocycloaddition catalyzed by Plm was studied by laser flash photolysis and theoretical OFT computation. These time-resolved results showed that the triplet excited states of Plms were generated with high efficiency and detected by their characteristic ultraviolet absorptions, which were quenched by DHP at almost diffusion controlled rate. Theoretical studies suggest that Plm is involved in the photocycloaddition process through the (3)(DHP center dot center dot center dot Plm)* triplet complexes and assists the stabilization of intermediates. All subsequent steps are predicted to be favorable and exothermic, leading to the cage dimers. (C) 2012 Elsevier B.V. All rights reserved.
18F-LABELED PRECURSOR OF PET RADIOACTIVE MEDICAL SUPPLIES, AND PREPARATION METHOD THEREOF
申请人:Chi Dae-Yoon
公开号:US20140194620A1
公开(公告)日:2014-07-10
The present invention relates to a precursor of positron emission tomography (PET) radioactive medical supplies, a preparation method thereof, and an application thereof, and more specifically, to a precursor having a tetravalent organic salt leaving group, a preparation method, and a method for preparing desired PET radioactive medical supplies in a high radiochemical yield within a short preparation time by introducing
18
F using the same through a single step. The precursor having a tetravalent organic salt leaving group of the present invention can simplify the known complex multistep preparation of radioactive medical supplies into a single step, can save production costs because an excessive amount of a phase transfer catalyst is not required, facilitates separation of a compound after reaction, and enables rapid reaction velocity. The features are appropriate for the mass production of PET radioactive medical supplies by an automated synthesis system.
Method for treating fibrotic diseases or other indications IC
申请人:Alteon, Inc.
公开号:US20020068729A1
公开(公告)日:2002-06-06
Provided, among other things, is a method of treating or ameliorating or preventing an indication of the invention in an animal, including a human comprising administering an effective amount of a compound of the formula I:
1
提供了一种处理、改善或预防动物包括人类发明的指示的方法,包括给予公式I的化合物的有效量:1
Method for treating fibrotic diseases or other indications with imidazolium agents
申请人:Alteon, Inc.
公开号:US20030176426A1
公开(公告)日:2003-09-18
Provided is a method of treating or ameliorating an indication of the invention in an animal, including a human, by administering an effective amount of a compound of the formula I:
1
wherein R
1
, R
2
, M, X and Z are as described supra. Also provided are certain imidazolium compounds and pharmaceutical compositions containing the imidazolium compounds.
preparation and investigation of triplet photosensitizers designed to be preferentially soluble in room-temperature ionic liquids are reported. Photosensitizers prepared by covalent attachment of 1-methylimidazole to aryl ketones are soluble in ionic liquids and remain in the ionic liquid layer when the solution is extracted with an organic solvent. The photosensitized isomerization of trans-β-ionol to cis-β-ionol
Method for treating fibrotic diseases or other indications ID
申请人:——
公开号:US20020177586A1
公开(公告)日:2002-11-28
Provided, among other things, is a method of treating or ameliorating or preventing an indication of the invention in an animal, including a human comprising administering an effective amount of a compound of the formula I:
1