Development of a Titanocene-Catalyzed Enyne Cyclization/Isocyanide Insertion Reaction
摘要:
The first early transition metal-catalyzed enyne cyclization reaction is described. The system converts enyne substrates to bicyclic iminocyclopentenes through the use of 10 mol % of Cp(2)Ti(PMe(3))(2) in the presence of a silyl cyanide. Subsequent hydrolysis produces the corresponding bicyclic cyclopentenones in good overall yield. The cyclization reaction is tolerant of polar functional groups such as ethers, amines, and esters and is diastereoselective with certain chiral enyne substrates.
SeO<sub>2</sub>-Mediated Oxidative Transposition of Pauson–Khand Products
作者:Sara E. Dibrell、Michael R. Maser、Sarah E. Reisman
DOI:10.1021/jacs.9b13818
日期:2020.4.8
Oxidative transpositions of bicyclic cyclopentenones mediated by selenium dioxide (SeO2) are disclosed. Treatment of Pauson-Khand reaction (PKR) products with SeO2 in the presence or absence of water furnishes di- and trioxidized cyclopentenones, respectively. Mechanistic investigations reveal multiple competing oxidation pathways that depend on substrate identity and water concentration. Functionalization
[EN] PYRROLOPYRIDAZINE JAK3 INHIBITORS AND THEIR USE FOR THE TREATMENT OF INFLAMMATORY AND AUTOIMMUNE DISEASES<br/>[FR] INHIBITEURS DE JAK3 DE TYPE PYRROLOPYRIDAZINE ET LEUR UTILISATION POUR TRAITER LES MALADIES INFLAMMATOIRES ET AUTO-IMMUNES
申请人:BRISTOL MYERS SQUIBB CO
公开号:WO2012125893A1
公开(公告)日:2012-09-20
The present invention provides compounds of formula I and pharmaceutically acceptable salts thereof. The formula I compounds inhibit tyrosine kinase activity of JAK3, thereby making them useful for the treatment of inflammatory and autoimmune diseases.
Catalytic Asymmetric Cyclocarbonylation of Nitrogen-Containing Enynes
作者:Shana J. Sturla、Stephen L. Buchwald
DOI:10.1021/jo990384f
日期:1999.7.1
The asymmetric Pauson-Khand type cyclization of nitrogen-containing enynes using carbon monoxide and a catalytic amount of (EBTHI)TiMe(2) was examined. The influence of the nitrogen substituent and the concentration of the catalyst on the enantioselectivity of this cyclization was explored, and it has been found that enynes with an octyl-, benzyl-, or allylamino group, positioned beta to the alkyne
Nickel-Catalyzed Reductive Cycloisomerization of Enynes with CO<sub>2</sub>
作者:Justin B. Diccianni、Tyler Heitmann、Tianning Diao
DOI:10.1021/acs.joc.7b01034
日期:2017.7.7
carboxylates from petroleum feedstock require a series of oxidation reactions. CO2 represents a cheap and sustainable, preoxidized C1 source. Herein, we describe a simple, selective, and mild procedure for the construction of (hetero)cyclic α,β-unsaturated carboxylic acids from 1,6- and 1,7-enyes and CO2. Terminal 1,7-enynes and stericallyhindered alkenes experience a change in regioselectivity and form
Pyrrolopyridazine JAK3 inhibitors and their use for the treatment of inflammatory and autoimmune diseases
申请人:Wrobleski Stephen T.
公开号:US08987268B2
公开(公告)日:2015-03-24
The present invention provides compounds of formula I and pharmaceutically acceptable salts thereof. The formula I compounds inhibit tyrosine kinase activity of JAK3, thereby making them useful for the treatment of inflammatory and autoimmune diseases.