2-, 3- and 4-Pivaloylamino derivatives of dibenzofuran [compounds (5), (4) and (6), respectively] and analogous 3-, 2- and 1-substituted derivatives of 9-methylcarbazole [compounds (8), (7) and (9), respectively] were subjected to lithiation at 0 degreesC and subsequent reaction with dimethylformamide. Aldehyde formation took place at positions alpha to delta to the heteroatom as follows: alpha for (4) and (7); delta for (5); delta and beta (3 : 1) for (8); and alpha' for (6). No formylation occurred with (9).
Design, synthesis and biological evaluation of LX2343 derivatives as neuroprotective agents for the treatment of Alzheimer's disease
作者:Guanglong Sun、Junwei Wang、Xiaodan Guo、Min Lei、Yinan Zhang、Xiachang Wang、Xu Shen、Lihong Hu
DOI:10.1016/j.ejmech.2017.12.080
日期:2018.2
A series of LX2343 derivatives were designed, synthesized and evaluated as neuroprotective agents for Alzheimer'sdisease (AD) in vitro. Most of the compounds displayed potent neuroprotective activities. Especially for compound A6, exhibited a remarkable EC50 value of 0.22 μM. Further investigation demonstrated that compound A6 can significantly reduce Aβ production and increase Aβ clearance, and alleviate
Disclosed is a method for producing an aminocarbazole by catalytically reducing a nitrocarbazole, wherein as a catalyst is used an active nickel-based catalyst prepared by contacting a nickel-based catalyst with an alkali and an iron compound under a hydrogen gas or inert gas atmosphere in an inert solvent, and according to the method of the present inventions decrease in reaction speed, decrease in yield of a product or the like depending upon the lot of the starting nitrocarbazoles can be prevented, and aminocarbazoles can be produced in a good yield constantly.
Disclosed is a method for producing an aminocarbazole by catalytically reducing a nitrocarbazole, wherein as a catalyst is used an active nickel-based catalyst prepared by contacting a nickel-based catalyst with an alkali and an iron compound under a hydrogen gas or inert gas atmosphere in an inert solvent, and according to the method of the present invention, decrease in reaction speed, decrease in yield of a product or the like depending upon the lot of the starting nitrocarbazoles can be prevented, and aminocarbazoles can be produced in a good yield constantly.
Thermally stable carbazole diazonium salts as sources of photo-initiated
申请人:E. I. Du Pont de Nemours and Company
公开号:US05002856A1
公开(公告)日:1991-03-26
This invention relates to carbazole diazonium salts which are used in pre-polymer or polymer compositions as sources of photoinitiated strong acids in such developments as imaging films where strong acids are needed to effect polymerization of the film or to remove protective groups.