Process for the preparation of substituted pyridines via
申请人:DSM N.V.
公开号:US05438143A1
公开(公告)日:1995-08-01
Process for the preparation of substituted pyridines by allowing 1-aza-1,3-butadienes to react, in the presence of a catalytic amount of secondary amine and acid, with an aldehyde or ketone, and new 1-aza-1,3-butadienes which are used in this process. Said pyridines can be obtained in high yield in a simple process with a short reaction time. The 1-aza-1,3-butadiene can, if so desired, be prepared in situ from an imine and an aldehyde.
Versatile approach to α-alkoxy carbamate synthesis and stimulus-responsive alcohol release
作者:R. Adam Mosey、Paul E. Floreancig
DOI:10.1039/c2ob26571k
日期:——
A series of α-alkoxy carbamates that cleave under mild conditions to release alcohols has been synthesized through a multicomponent process. The relationship between structural features in these compounds and the rate of alcohol release in the presence of basic hydrogen peroxide has been studied. The preparation of carbamates that cleave under other conditions has been demonstrated.
Osmium-Promoted Transformation of Alkyl Nitriles to Secondary Aliphatic Amines: Scope and Mechanism
作者:Juan C. Babón、Miguel A. Esteruelas、Ana M. López、Enrique Oñate
DOI:10.1021/acs.organomet.0c00236
日期:2020.6.8
symmetrical and asymmetricalsecondary aliphatic amines promoted by the hexahydride complex OsH6(PiPr3)2 (1) is described, and the mechanisms of the reactions involved are established. Complex 1 catalyzes the aforementioned transformations of aryl-, pyridyl-, and alkoxy-functionalized alkyl nitriles with linear or branched chains. The formation of the secondary amines involves primary imines, primary amines
描述了由六氢化物配合物OsH 6(P i Pr 3)2(1)促进的烷基腈向对称和不对称仲脂肪族仲胺的转化,并建立了涉及的反应机理。配合物1催化具有直链或支链的芳基,吡啶基和烷氧基官能化的烷基腈的上述转化。仲胺的形成涉及伯亚胺,伯胺和仲亚胺作为有机中间体。反应在温和的条件下(甲苯,100°C和4 bar H 2)进行。1的化学计量反应与新戊腈和2-甲氧基乙腈一起使我们能够分离三氢化物氮杂亚乙烯基衍生物OsH 3 ═N═CHR}(P i Pr 3)2(R = t Bu(3),CH 2 OMe(4))。它们的形成涉及将底物的N–C三键插入不饱和四氢化物OsH 4(P i Pr 3)2(A)的Os–H键中,这是通过从六氢化合物中消除H 2产生的前体。这些三氢化物氮杂亚乙烯基物质与H 2的反应是还原腈的N-C三键的关键步骤。在没有H 2的情况下,A对氮杂亚乙烯基配体的攻击会导致其C(sp 2)–C(sp
A straightforward approach towards thiazoles and endothiopeptides via Ugi reaction
作者:Uli Kazmaier、Stefanie Ackermann
DOI:10.1039/b507028g
日期:——
Endothiopeptides can easily be obtained via Ugi reaction using thio acids as acid components. If isonitriles with an acetal group are applied, the endothiopeptides can directly be converted into thiazoles using TMSCl–NaI under microwave irradiation.
使用硫代酸作为酸组分,通过 Ugi 反应可以很容易地获得内硫肽。如果使用带有缩醛基团的异腈,则内硫肽可在微波辐照下使用 TMSCl-NaI 直接转化为噻唑。
BOYD D. R.; STUBBS M. E.; HAMILTON R.; THOMPSON N. T., TETRAHEDRON LETT., 1979, NO 34, 3201-3204
作者:BOYD D. R.、 STUBBS M. E.、 HAMILTON R.、 THOMPSON N. T.