Ordered short channel mesoporous silica modified with 1,3,5-triazine–piperazine as a versatile recyclable basic catalyst for cross-aldol, Knoevenagel and conjugate addition reactions with isatins
作者:Naveen Gupta、Tamal Roy、Debashis Ghosh、Sayed H. R. Abdi、Rukhsana I. Kureshy、Noor-ul H. Khan、Hari C. Bajaj
DOI:10.1039/c5ra00406c
日期:——
A recyclable triazine–piperazine immobilized silica supported material was explored as a heterogeneous catalyst for indole skeletal synthesized from isatins at RT.
Ketone–ketone cross-aldolreaction of isatins and unactivated ketones was catalyzed by glucose-containing imidazolium salt β-1-imidazole-2,3,4,6-tetra- o -hydroxy- d -glucopyranosyl bromide in neutral condition to generate 3-alkyl-3-hydroxyindolin-2-ones in excellent yield.
含葡萄糖的咪唑鎓盐β-1-咪唑-2,3,4,6-四氢呋喃-丁酮催化靛红与未活化酮的酮-酮交叉羟醛反应。 Ø -羟基- d -葡糖吡喃糖基溴在中性条件下生成3-烷基-3-羟基吲哚-2-酮的产率很高。
Cu(<scp>ii</scp>)-thiophene-2,5-bis(amino-alcohol) mediated asymmetric Aldol reaction and Domino Knoevenagel Michael cyclization: a new highly efficient Lewis acid catalyst
作者:Abdullah Mohammed Al-Majid、Abdullah Saleh Alammari、Saeed Alshahrani、Matti Haukka、Mohammad Shahidul Islam、Assem Barakat
DOI:10.1039/d2ra00674j
日期:——
acid-catalytic system Cu(II)-thiophene-2,5-bis(amino-alcohol) has been developed for enantioselective Aldol reaction of isatin derivatives with ketones. The new catalytic system also proved to be highly enantioselective for the one pot three-component Domino Knoevenagel Michael cyclization reaction of substituted isatin with malononitrile and ethylacetoacetate. The chiral ligand (2S,2′S)-2,2′-((thiophene-2
高效路易斯酸催化体系Cu( II )-噻吩-2,5-双(氨基-醇)已被开发用于靛红衍生物与酮的对映选择性羟醛反应。新的催化体系还被证明对取代靛红与丙二腈和乙酰乙酸乙酯的一锅三组分Domino Knoevenagel Michael环化反应具有高度对映选择性。手性配体 (2 S ,2' S )-2,2'-((噻吩-2,5-二基双(亚甲基))双(氮杂二基))双(3-苯基丙-1-醇) ( L1 ) 组合使用 Cu(OAc) 2 ·H 2 O 作为新型路易斯酸催化剂,以良好至优异的产率 (81–99%) 和高对映选择性制备了 3-取代-3-羟基二氢吲哚-2-酮衍生物 ( 3a–s ) (高达 96% ee)和螺[4 H -吡喃-3,3-羟吲哚]衍生物( 6a–l )具有优异的产率(89–99%)和高 ee(高达 95%)。这些羟醛产物和螺羟吲哚构成了大量药物活性分子和天然产物的核心结构基序。
Tailoring the Chemical Structure of Nitrogen‐Doped Carbon Dots for Nano‐Aminocatalysis in Aqueous Media
different nitrogen-doped carbondots (NCDS) are investigated for the functionalization of carbonyl compounds. The surface amines of all the NCDs were comprehensively characterized, allowing a correlation between the structural features of the nanoparticles and their catalytic performances. The most active nano-aminocatalyst was used to drive organic reactions in aqueousmedia.
Design, synthesis and insilico studies of 3-fluoro-3-substituted oxindoles against cancer targets
作者:P.L.N. Ranganath、A. Venkat Narsaiah
DOI:10.1016/j.jfluchem.2023.110134
日期:2023.5
substituted isatins were subjected to Aldol condensation with various ketones. The resulted 3-hydroxy compounds were transformed into fluorine derivatives. Thus obtained, 3-fluoro-3-substituted oxindoles were screened for Insilco evaluation against anti-cancer targets VEGFR2 and GSK-3β. The study reveals that the fluoro compounds showed binding at their active sites. Particularly, compounds 4i, 4n and