Reaction of isatin with alkylating agents with acidic methylenes
摘要:
The reaction of isatin (1) with different alkyl halides 2 and alkaline carbonates in aprotic polar solvents leads mainly to N-alkyl derivatives 3. The use of alkylating agents that have acidic methylenes leads to competitive formation of the corresponding epoxide 5. The formation of 5 is favored by low-polarity solvents at low temperatures and strong bases. Epoxides 5c, d obtained using NaEtOH/EtOH at 0-5 degrees C are transformed into the corresponding 4-quinolinones 6 at higher temperatures. The use of Ag2CO3 allows obtaining compounds 3 as major products, along with varying amounts of labile O-alkyl derivatives 4 and dimerization products. (C) 2012 Elsevier Ltd. All rights reserved.
A concise, diastereoselective totalsynthesis of (±)-cortistatinJ has been completed in 20 steps from furan. Key steps include an intramolecular [4 + 3] cyclization of a disubstituted furan with a (Z)-2-(trialkylsilyloxy)-2-enal to construct the tetracyclic core and a (Z)-vinylsilane/iminium ion cyclization to form the A ring.
Pt(IV) derivatives formed by oxidative addition of organic halides to [Pt(CH3)2(N,N-chelate)] substrates: geometric isomers at equilibrium
作者:Vincenzo De Felice、Bruno Giovannitti、Augusto De Renzi、Diego Tesauro、Achille Panunzi
DOI:10.1016/s0022-328x(99)00634-8
日期:2000.1
isomerism at equilibrium of Pt(IV) derivatives of general formula [Pt(CH3)2(R)X(NN)] (NN=2,9-dimethyl-1,10-phenanthroline or 1,10-phenanthroline; R=σ C-bonded ligand; X=halide) has been investigated by variation of R, X, and NN. The complexes have been obtained mainly through oxidative addition of RX to [Pt(CH3)2(NN)]. Some general trends can be traced in the relative stability of the geometrical isomers
通式[Pt(CH 3)2(R)X(NN)]的Pt(IV)衍生物在平衡时的几何异构现象(NN= 2,9-二甲基-1,10-菲咯啉或1, 10-菲咯啉; R =σC键合的配体; X =卤化物)已通过R,X和N = N的变化进行了研究。主要通过将RX氧化加成到[Pt(CH 3)2(N = N)]中而获得配合物。某些一般趋势可以追溯到配合物的几何异构体的相对稳定性,并且已经提出了区分空间和电子因素的尝试。还报道了具有三种不同类型的σC键合基团的通式[Pt(CH 3)2(R)R'(NN)]化合物的首次获得。
Phosphetane Oxides as Redox Cycling Catalysts in the Catalytic Wittig Reaction at Room Temperature
作者:Lars Longwitz、Anke Spannenberg、Thomas Werner
DOI:10.1021/acscatal.9b02456
日期:2019.10.4
renewable solvent. The intermediates of the Wittig reaction were analyzed by 31P NMR spectroscopy, and in situ NMR experiments confirmed phosphaneoxide as the resting state of the catalyst. Further kinetic investigations revealed a striking influence of the base on the rate of phosphaneoxidereduction.
[EN] TETRACYCLIC HETEROCYCLE COMPOUNDS AND METHODS OF USE THEREOF FOR THE TREATMENT OF HEPATITIS C<br/>[FR] COMPOSÉS HÉTÉROCYCLIQUES TÉTRACYCLIQUES ET LEURS PROCÉDÉS D'UTILISATION POUR LE TRAITEMENT DE L'HÉPATITE C
申请人:MERCK SHARP & DOHME
公开号:WO2014121417A1
公开(公告)日:2014-08-14
The present invention relates to compounds of formula (I) that are useful as hepatitis C virus (HCV) NS5B polymerase inhibitors, the synthesis of such compounds, and the use of such compounds for inhibiting HCV NS5B polymerase activity, for treating or preventing HCV infections and for inhibiting HCV viral replication and/or viral production in a cell-based system.
Novel structural analogs of glyphosate based on azoles. 2*. N-Substituted imidazoles and pyrazoles obtained by alkylation of heterocycles containing carboxyl or phosphoryl groups in the ring
作者:N. V. Pavlenko、T. I. Oos、N. V. Kirij、Yu. L. Yagupolskii、A. van Almsick、L. Willms
DOI:10.1007/s10593-011-0777-1
日期:2011.7
Alkylation of 4(5)-substituted 1H-imidazoles using the corresponding reagents gave imidazole 1,4-isomers containing phosphoryl and carboxyl groups together in the ring and in the alkyl fragment. The alkylation of pyrazoles containing a carboxyl group at positions 3(5) and 4 of the ring using diethyl phosphonomethyltriflate has been studied.