Chemical Synthesis of Coelenterazine and Its Analogs: New Route toward Four Segment-Couplings
摘要:
A novel and improved synthetic route includes four segment-couplings toward coelenterazine and its analogs as luminescent molecules. Regio- and chemo-selective cross coupling reactions using palladium catalysts with 5-iodo-3-bromo-2-aminopyrazine have enabled providing various aminopyrazine derivatives having different substituents. The improved synthesis of coelenterazine and its analogs employed advanced condensation with the aminopyrazines using various keto-acetal segments, which resulted in much higher yields to give the final imidazopyrazinone heterocycles than the previous method using keto-aldehydes.
LIGAND, NICKEL COMPLEX COMPRISING THE LIGAND, AND REACTION USING THE NICKEL COMPLEX
申请人:NATIONAL UNIVERSITY CORPORATION NAGOYA UNIVERSITY
公开号:US20160074853A1
公开(公告)日:2016-03-17
An object of the present invention is to provide a method for directly performing arylation (particularly α-arylation) of carbonyl or thiocarbonyl compounds using a more inexpensive phenol derivative and nickel catalyst. Another object of the present invention is to provide a novel nickel catalyst that can be used in this method, and a novel ligand of the nickel catalyst. The novel compounds of the present invention are a compound having a diphosphine skeleton in which a five- or six-membered heterocyclic ring is substituted with two dialkylphosphines and/or dicycloalkylphosphines, or a salt thereof, and a compound having the diphosphine skeleton that is bound to nickel. Moreover, coupling reaction of a carbonyl compound and a phenol derivative can be advanced in the presence of a nickel compound having a monodentate or bidentate dialkylphosphine and/or dicycloalkylphosphine skeleton.
simple procedure for the synthesis of 3 has been developed by a unique acid catalysed diazoketone cyclisation. It deserves mention in this connection that the acid catalyzed cyclization was facile with 3-methoxy-benzyl diazomethylketone (8) but 4-methoxybenzyl diazomethylketone (2) was reluctant to cyclize. All attempts in this direction resulted in the formation of a hydroxy ketone (4) as a major product
1,4-Dioxen-2-yl lithium reacts with ketones or aldehydes to give alcohols which lead after an allylic rearrangement under mild conditions, followed by reduction and hydrolysis to α-hydroxymethyl ketones in fair yields.
NOVEL CYCLIC UREAS USED AS INHIBITORS OF METALLOPROTEASES
申请人:LINDENSCHMIDT Andreas
公开号:US20080096918A1
公开(公告)日:2008-04-24
The present invention relates to a novel compound of the formula I:
and/or all stereoisomeric forms of the compound of the formula I and/or mixtures of these forms in any ratio, and/or a physiologically tolerated salt of the compound of the formula I, in which R1 to R5 and V1, V2 have the meanings stated in the claims and specification. The inventive compounds are suitable as inhibitors of metalloproteases, especially of ADAMTS proteases and TNF-α converting enzyme (TACE), and for the treatment of disorders such as but not limited to osteoarthrosis and rheumatoid arthritis.
Cyclic ureas used as inhibitors of metalloproteases
申请人:sanofi-aventis Deutschland GmbH
公开号:US07652143B2
公开(公告)日:2010-01-26
The present invention relates to a novel compound of the formula I:
and/or all stereoisomeric forms of the compound of the formula I and/or mixtures of these forms in any ratio, and/or a physiologically tolerated salt of the compound of the formula I, in which R1 to R5 and V1, V2 have the meanings stated in the claims and specification. The inventive compounds are suitable as inhibitors of metalloproteases, especially of ADAMTS proteases and TNF-α converting enzyme (TACE), and for the treatment of disorders such as but not limited to osteoarthrosis and rheumatoid arthritis.