Functionalized 4-benzylated pyridines can be efficiently prepared by a transition-metal-freecross-coupling between various benzylic zinc chlorides and substituted 4-cyanopyridines in THF/DMPU under microwave irradiation (40 °C, 0.5–1.5 h). Selective benzylations on polycyano-aromatics have also been achieved under these mild conditions. We also report a novel oxidative nucleophilic substitution of
or tetracyclic compounds in 43−79% yield. Dipyrido[1,2-a:4′,3′-d]pyrimidin-11-one and dipyrido[1,2-a:3′,4′-d]pyrimidin-5-one showed a good bactericidal activity against Pseudomonas aeroginosa. Dipyrido[1,2-a:2′,3′-d]pyrimidin-5-one and pyrido[2′,3′:4,5]pyrimidino[2,1-a]isoquinolin-8-one showed a fungicidal activity against Fusarium and dipyrido[1,2-a:4′,3′-d]pyrimidin-11-one against Candida albicans
使用(TMP)3将所有吡啶腈和酯金属在与导向基团相邻的位置上金属化室温下于四氢呋喃中的CdLi。将2-,3-和4-氰基吡啶用0.5当量的碱处理2小时,得到碘,然后用碘捕获,分别得到相应的3-碘,2-碘和3-碘衍生物从30%到61%不等。氰吡嗪在3位上的功能相似,产率为43%。由相应的吡啶酯合成3-碘吡啶甲酸乙酯和-异烟酸乙酯,产率为58%和65%。在相同条件下也形成了不稳定的4-碘烟酸乙酯,并以38%的两步产率将其直接转化为4-(吡唑-1-基)烟酸乙酯。所有三种碘吡啶吡啶甲酸乙酯都参与了使用2-氨基吡啶的一锅钯催化的交叉偶联反应/环化反应,从而提供了新的二吡啶基[1,2- a:3',2'-d ] pyrimidin-11-one,dipyrido [1,2- a:4',3' - d ] pyrimidin-11-one和dipyrido [1,2- a:3',4' - d ] pyrimidin-5
Cyanide Anion as a Leaving Group in Nucleophilic Aromatic Substitution: Synthesis of Quaternary Centers at Azine Heterocycles
作者:Alexander D. Thompson、Malcolm P. Huestis
DOI:10.1021/jo302307y
日期:2013.1.18
Nucleophilic aromatic substitution of 2- or 4-cyanoazines with the anions derived from aliphatic α,α-disubstituted esters and nitriles leads to displacement of the cyanide function. Enabling cyanides to be used as highly active leaving groups in SNAr reactions provides additional flexibility in starting materials for synthesis. We show that, in many cases, the cyanide leaving group is displaced preferentially
用衍生自脂族α,α-二取代的酯和腈的阴离子对2-或4-氰基嗪进行亲核芳族取代会导致氰化物官能团的置换。使氰化物能够在S N Ar反应中用作高活性离去基团,为合成原料提供了额外的灵活性。我们表明,在许多情况下,氰化物离去基团在卤素存在下优先被取代。所得的杂芳基碘化物,溴化物和氯化物随后可用作进一步化学多样化的处理方法。
[EN] INHIBITORS OF BETA-SECRETASE<br/>[FR] INHIBITEURS DE LA BÊTA-SECRÉTASE
申请人:DILLARD LAWRENCE W
公开号:WO2011106414A1
公开(公告)日:2011-09-01
The present invention relates to compounds represented by Structural Formula (I) or a pharmaceutically acceptable salt thereof. Definitions for the variables are provided herein.
本发明涉及由结构式(I)表示的化合物或其药用盐。这里提供了变量的定义。
Triphenylphosphine derivative, production process therefor, palladium complex thereof, and process for producing biaryl derivative
申请人:——
公开号:US20030065208A1
公开(公告)日:2003-04-03
Provided are a novel triphenyl phosphine derivative synthesized from a triphenylphosphine and a hydroxy-containing lactone; a palladium and a nickel complexes comprising the derivative as a ligand; and a process for preparing a biaryl derivative using the complex as a catalyst. A product can be easily separated from a catalyst or a phosphorus compound, and biaryl derivative can be synthesized in a higher yield, by using the complex of the present invention as a catalyst.