Metathesis cascade strategies (ROM–RCM–CM): a DOS approach to skeletally diverse sultams
作者:Kyu Ok Jeon、Dinesh Rayabarapu、Alan Rolfe、Kelly Volp、Iman Omar、Paul R. Hanson
DOI:10.1016/j.tet.2009.03.080
日期:2009.6
ring-opening metathesis/ring-closing metathesis/cross-metathesis (ROM–RCM–CM) cascade strategy to the synthesis of a diverse collection of bi- and tricyclic sultams is reported. In this study, functionalized sultam scaffolds derived from intramolecularDiels–Alder (IMDA) reactions undergo metathesiscascades to yield a collection of tricyclic sultams. Additional appendage-based diversity was achieved
据报道,开发了开环复分解/闭环复分解/交叉复分解(ROM-RCM-CM)级联策略来合成多种双环和三环磺内酯。在这项研究中,源自分子内狄尔斯-阿尔德(IMDA)反应的功能化磺内酰胺支架经历复分解级联,产生一系列三环磺内酰胺。通过利用各种 CM 合作伙伴,实现了基于附属物的额外多样性。
Murai Reaction on Furfural Derivatives Enabled by Removable<i>N</i>,<i>N</i>′-Bidentate Directing Groups
作者:Cristofer Pezzetta、Luis F. Veiros、Julie Oble、Giovanni Poli
DOI:10.1002/chem.201701850
日期:2017.6.22
Furfural and related compounds are industrially relevant building blocks obtained from lignocellulosic biomass. To enhance the added value of these renewable resources, a Ru‐catalyzed hydrofurylation of alkenes, involving a directed C−H activation at C3 of the furan ring, was developed. A thorough experimental study revealed that a bidentate amino‐imine directing group enabled the desired coupling
An efficient approach to isoindolo[2,1-b][2]benzazepines via intramolecular [4+2] cycloaddition of maleic anhydride to 4-α-furyl-4-N-benzylaminobut-1-enes
作者:Fedor I. Zubkov、Ekaterina V. Boltukhina、Konstantin F. Turchin、Alexey V. Varlamov
DOI:10.1016/j.tet.2004.07.008
日期:2004.9
nobut-1-enes with maleic anhydride gave 4-oxo-3-aza-10-oxatricyclo[5.2.1.01,5]dec-8-ene-6-carboxylic acid via amide formation followed by intramolecular Diels–Alder reaction of furan (IMDAF). The cycloaddition proceeded under mild reaction conditions (25 °C) and provided only the exo-adduct in quantitative yield. Treatment of this compound with PPA gave isoindolo[2,1-b][2]benzazepine derivatives via
将4-α-呋喃基-4- N-苄基氨基丁-1-烯与马来酸酐酰化,得到4-氧代-3-氮杂-10-氮杂三环[5.2.1.0 1,5 ] dec-8-烯-6-羧酸通过酰胺形成,然后发生呋喃的分子内Diels-Alder反应(IMDAF)。环加成反应条件温和(25℃),并仅设置下进行外,定量收率-adduct。用PPA处理该化合物通过开环,芳构化和分子内亲电烷基化得到异吲哚并[2,1- b ] [2]苯并ze庚因衍生物。为了扩大反应顺序的范围,7-oxo-5,11b,12,13-tetrahydro-7 H -isoindolo [ 2,1- b] [2]苯并ze庚因-8-羧酸被进一步转化为有用的合成中间体。
Regioselective Domino Metathesis of 7-Oxanorbornenes and Its Application to the Synthesis of Biologically Active Glutamate Analogues
作者:Minoru Ikoma、Masato Oikawa、Martin B. Gill、Geoffrey T. Swanson、Ryuichi Sakai、Keiko Shimamoto、Makoto Sasaki
DOI:10.1002/ejoc.200800704
日期:2008.11
A highly regioselectivedominometathesis reaction of 7-oxanorbornene was developed that employed an intramolecular association of an amide carbonyl group to a ruthenium metal centre. By using this reaction, twelve glutamateanalogues inspired by dysiherbaine were efficiently synthesized over 12-14 steps; one of the analogues exhibited bioactivity consistent with central nervous system depression.
Palladium meditated CPhenyl–H bond activation of 2-furylimines versus tert-2-furylbenzylamines
作者:Zhao-Xia Hu、Nan Ma、Jin-Hua Zhang、Wen-Ping Hu、Hong-Xing Wang
DOI:10.1016/j.poly.2014.03.041
日期:2014.11
The reactions of 2-furylimines 2a-f and Na2PdCl4 in the presence of NaOAc at 8-10 degrees C result in nitrogen-palladium coordinated complexes 3a-f. Reduction of 2d-f with NaBH4 followed by N-methylation leads to the corresponding tert-2-furylbenzylamines 5a-c. Treatment of 5a-c with Na2PdCl4 at the same reaction condition as mentioned above affords palladacycles 6a-c where the Pd atoms connect to the phenyl ring rather than the furyl ring. The fact that 5a-c are more active than 2d-f in C-Phenyl-H bond activation implies that the electron density of C10 or C8 atom in former is higher than those in latter. Compounds 3a-f, 5a-c, 6a-c were identified by elemental analysis, IR and NMR. In addition, the structures of 3b, 3f and 6c were also confirmed by their single crystal X-ray diffractions. (C) 2014 Elsevier Ltd. All rights reserved.