A facile and efficient method for the synthesis of N-substituted-3-oxoisoindoline-1-carbonitrile derivatives catalyzed by sulfamic acid
作者:Ling-Jun Hu、Zha-Jun Zhan、Min Lei、Li-Hong Hu
DOI:10.3998/ark.5550190.0014.315
日期:——
A new and efficientmethod for the synthesis of N-substituted 3-oxoisoindoline-1-carbonitrile derivatives by a one-pot, three-component condensation reaction of 2-carboxybenzaldehyde, primary amine, and TMSCN in the presence of 10 mol % sulfamicacid (NH2SO3H) as the catalyst in EtOH under reflux temperature is described. The process is simple and environmentally benign and the catalyst is commercially
cyanide to the in situ formed imines. A comparative study of the 31P-NMR (NuclearMagneticResonance) along with IR (Infrared) data analysis for the Kraft lignin and methylated Kraft lignin samples ascertained the importance of the free hydroxyl groups in the activation of the mechanochemical reaction. The solvent-free mechanochemical Strecker reaction was then coupled with a lactamization process leading
ammonium salt‐catalyzed synthesis of chiral 3,3‐disubstituted isoindolinones bearing a heteroatom functionality in the 3‐position. A broad variety of differently substituted CF3S‐ and RS‐derivatives were obtained with often high enantioselectivities when using Maruoka's bifunctional chiral ammonium salt catalyst. In addition, a first proof‐of‐concept for the racemic synthesis of the analogous F‐containing
我们在此报告了铵盐催化合成在3位带有杂原子官能团的手性3,3-二取代异吲哚啉酮。使用 Maruoka 的双功能手性铵盐催化剂时,可以获得多种不同取代的 CF 3 S 和 RS 衍生物,且通常具有较高的对映选择性。此外,还获得了类似含 F 产品外消旋合成的第一个概念验证,从而获得了相当稳定的 α-F-α-氨基酸衍生物的罕见例子之一。
Asymmetric Organocatalyzed Transfer Hydroxymethylation of Isoindolinones Using Formaldehyde Surrogates
asymmetric transfer hydroxymethylation of activated isoindolinones, allowing us to prepare the enantioenriched hydroxymethylated adducts in good to excellent yields (48–96%) and enantiopurities (81:19–97:3 e.r.). To increase the reaction rate without compromising the selectivity, carefully optimized formaldehyde surrogates were employed, providing a convenient source of anhydrous formaldehyde with a base-triggered
Sc(OTf)3-catalyzed three-component cascade reaction: One-pot synthesis of substituted 3-oxoisoindoline-1-carbonitrile derivatives
作者:Tingting Chen、Chun Cai
DOI:10.1016/j.catcom.2015.11.011
日期:2016.1
A facile and efficient approach for the synthesis of N-substituted 3-oxoisoindoline-1-carbonitrile derivatives has been developed, with a Sc(OTf)(3)-catalyzed three-component Strecker/Lactamization cascade reaction involving methyl 2-formylbenzoate, TMSCN and amines in ethanol at room temperature. Good to excellent yields for a broad scope of amine substrates were achieved. (C) 2015 Published by Elsevier B.V.