Access to dihydropyridinones and spirooxindoles: application of N-heterocyclic carbene-catalyzed [3+3] annulation of enals and oxindole-derived enals with 2-aminoacrylates
A strategy for the NHC-catalyzedsynthesis of dihydropyridinones and spirooxindoles has been developed via [3+3] annulation reactions of enals or isatin-derived enals with 2-aminoacrylates under oxidative conditions. In this efficient strategy, the 2-aminoacrylates served as nucleophiles. Modifying the standard base switched the carbon–carbon double bond formation from 5,6-positions to 3,4-positions
Metal-Free Synthesis of Polysubstituted Imidazolinone Through Cyclization of Amidines with 2-Substituted Acrylates
作者:Zhen Liu、Yan-Shun Zhang、Yin Wei、Min Shi
DOI:10.1002/ejoc.201901687
日期:2020.3.8
A facile metal‐free cascade nucleophilic cyclization of amidines with 2‐substituted acrylates has been developed, producing polysubstituted imidazolinone derivatives in moderate to good yields with a broad substrate scope.
Synthesis of Dihydro-2-oxopyrrole (DPO) Building Blocks Catalyzed by Potassium Carbonate
作者:Yan-Shun Zhang、Hou-Ze Gui、Yin Wei、Min Shi
DOI:10.1002/ejoc.201901504
日期:2019.11.14
We have disclosed a novel and efficient dimerization and cyclization cascade reaction of 2‐sulfonaminoacrylate derivatives catalyzed by K2CO3 to synthesize dihydro‐2‐oxopyrroles (DPO) in moderate to good yields in one step.
我们已经公开了一种新颖且有效的K 2 CO 3催化的2-磺氨基丙烯酸酯衍生物的二聚和环化级联反应,可一步一步以中等到良好的产率合成二氢-2-氧代吡咯(DPO)。
Dehydrooligopeptides. I. The Facile Coupling of α-Amino Acids with α-Dehydroamino Acids to Dehydrodipeptides
N-Cbz- or N-Tos-α-dehydroamino acid (DHA) and its ester were prepared by the condensation of 2-oxo carboxylic acid or ester with benzyl carbamate or p-toluenesulfonamide. Subsequently, the N-protected DHA and its N-free ester thus obtained were coupled with several L-α-amino acid esters and N-protected (Boc or Cbz)-L-α-amino acid respectively by the usual peptide synthetic methods to give a number
N-Cbz-或N-Tos-α-脱氢氨基酸(DHA)及其酯是通过2-氧代羧酸或酯与氨基甲酸苄酯或对甲苯磺酰胺缩合制备的。随后,将由此获得的 N-保护的 DHA 及其无 N-酯分别与几种 L-α-氨基酸酯和 N-保护的(Boc 或 Cbz)-L-α-氨基酸通过通常的肽合成方法偶联到给出许多不同类型的脱氢二肽。获得的所有新 DHA 和脱氢二肽的构型均显示为 (Z)-几何。
Construction of spirothioureas having an amino quaternary stereogenic center <i>via</i> a [3 + 2] annulation of 3-isothiocyanato oxindoles with 2-aminoacrylates
作者:Hou-Ze Gui、Yin Wei、Min Shi
DOI:10.1039/c8ob02748j
日期:——
useful and convenient strategy for the diastereoselective synthesis of spirothioureas having an amino quaternary stereogenic center via a [3 + 2] annulation of 3-isothiocyanato oxindoles with 2-aminoacrylates was established. A diverse set of spirooxindole derivatives were synthesized in good to excellent yields and diastereoselectivities. Good enantioselectivities (up to 96 : 4 er) were obtained in