Intramolecular diels-alder cycloadditions of vinylketenimines. A convergent route to carbazoles and pyridocarbazole alkaloids
作者:Edmond Differding、Léon Ghosez
DOI:10.1016/s0040-4039(00)98574-5
日期:1985.1
The intramolecularDiels-Aldercycloaddition of acetylenic vinylketenimines is the key step of a highly convergent synthesis of carbazoles. A facile synthesis of N-methyl-tetrahydroellipticine has been completed in five isolated steps from N-methyl piperidone.
[EN] PROCESS TO PREPARE EPSILON-CAPROLACTAM<br/>[FR] PROCÉDÉ POUR PRÉPARER DE L'EPSILON-CAPROLACTAME
申请人:UNIV LEIDEN
公开号:WO2014163506A1
公开(公告)日:2014-10-09
The invention is directed to a process to prepare ε-caprolactam and/or unsaturated ε-caprolactam from a pentenamide by contacting the pentenamide with a mixture of hydrogen and carbon monoxide in the presence of a solvent and a catalyst system comprising of a Group 8-10 metal and a phosphorus-donor ligand. The ligand may be a xantphos-type ligand.
Synthetic Studies toward the Total Synthesis of Tautomycetin
作者:Danilo Pereira de Sant’Ana、Celso de Oliveira Rezende Júnior、Jean-Marc Campagne、Luiz Carlos Dias、Renata Marcia de Figueiredo
DOI:10.1021/acs.joc.9b01712
日期:2019.10.4
The studies culminating in the synthesis of two large subunits of tautomycetin are described. The first one, fragment C1-C12 that has an anti-1,3-dimethyl system and a terminal diene unit, was accomplished in 10 linear steps in 7.4% overall yield. The second one, fragment C13-C25 which bears the sensitive anhydride framework and the majority of the stereogenic centers, was prepared in 13 linear steps
Synthesis of γ-hydroxy α,β-unsaturated amides by base-induced isomerization of epoxy amides
作者:Peter B. Brooks、Charles M. Marson
DOI:10.1016/s0040-4020(98)00519-5
日期:1998.8
Treatment of 3,4-epoxyamides with LDA affords γ-hydroxy-α,β-unsaturatedamides, usually with high (E)-selectivity. The 3,4-epoxyamides were prepared by the epoxidation of β,γ-unsaturated amides with meta-chloroperbenzoic acid.
Dirhodium(II)-Mediated Alkene Epoxidation with Iodine(III) Oxidants
作者:Ali Nasrallah、Gwendal Grelier、Maria Ivana Lapuh、Fernando J. Duran、Benjamin Darses、Philippe Dauban
DOI:10.1002/ejoc.201800306
日期:2018.11.15
combination of the dirhodium(II) complex Rh2(tpa)4 (tpa = triphenylacetate) with the iodine(III) oxidant PhI(OPiv)2 is shown to promote the epoxidation of alkenes in the presence of 2 equivalents of water. The reaction can be applied to diversely substituted alkenes and the corresponding epoxides are isolated with yields of up to 90 %. A possible mechanism involves the dirhodium(II) complex as a Lewis
Dirhodium (II) 络合物和碘 (III) 氧化剂已在合成氮烯化学中找到有用的应用。在这项研究中,二铑(II)配合物 Rh2(tpa)4(tpa = 三苯乙酸盐)与碘(III)氧化剂 PhI(OPiv)2 的组合被证明在 2 当量的水。该反应可应用于不同取代的烯烃,并以高达 90% 的产率分离相应的环氧化物。一种可能的机制涉及二铑 (II) 络合物作为路易斯酸物质,它可以调节碘 (III) 试剂的氧化特性。