本文介绍了一种高效,环保的合成β-氨基羰基化合物的方法。在不存在任何催化剂的情况下,通过使用无溶剂的氮杂-迈克尔加成反应,由氧杂冰片烯和胺成功地制备了氧杂冰片烯β-氨基酯和β-烯胺酯。氧杂降冰片烯β-氨基酯是室温下的主要产物,但较高的温度(例如90°C)导致形成β-烯胺酯。此外,所有目标化合物均通过IR,1 H NMR,13 C NMR和HR-MS表征。还提出了可能的反应途径。
cobalt(III)-catalyzed, redox-neutral, intermolecular carboamination of propiolates and bicyclic alkenes was developed. This non-annulative coupling strategy features atom economy, high regioselectivity, good yields, and functional groups tolerance. Such a carboamination reaction was applied to modified phenolsfrom the corresponding phenols under mild conditions.
Palladium-Catalyzed <i>Ortho</i>-Silylation of Aryl Iodides with Concomitant Arylsilylation of Oxanorbornadiene: Accessing Functionalized (<i>Z</i>)-β-Substituted Vinylsilanes and Their Analogues
作者:Weiwei Lv、Si Wen、Jia Yu、Guolin Cheng
DOI:10.1021/acs.orglett.8b02106
日期:2018.8.17
A palladium-catalyzed ortho-silylation of aryliodides/arylsilylation of oxanorbornadiene/retro-Diels–Alder domino reaction was developed. Such a transformation provides access to various functionalized (Z)-β-substituted vinylsilanes with exclusive selectivity using hexamethyldisilane as a bis-silylation reagent and 2,3-dicarbomethoxy-7-oxanorbornadiene (ONBD) as an ortho-C–H activator and ethylene
Biosynthesis of the Enterotoxic Pyrrolobenzodiazepine Natural Product Tilivalline
作者:Elisabeth Dornisch、Jakob Pletz、Ronald A. Glabonjat、Florian Martin、Christian Lembacher-Fadum、Margit Neger、Christoph Högenauer、Kevin Francesconi、Wolfgang Kroutil、Klaus Zangger、Rolf Breinbauer、Ellen L. Zechner
DOI:10.1002/anie.201707737
日期:2017.11.13
the biosynthesis of tilivalline and show that this nonribosomal peptide assembly pathway initially generates tilimycin, a simple pyrrolobenzodiazepine with cytotoxic properties. Tilivalline results from the non-enzymatic spontaneous reaction of tilimycin with biogenetically generated indole. Through a chemical total synthesis of tilimycin we could corroborate the predictions made about the biosynthesis
The allylation of heterobicyclicalkenes is presented for the first time. By using an inexpensive cobalt salt as the catalyst and easy‐to‐handle potassium allyltrifluoroborate as the reagent, an unprecedented formal hydroallylation of the bicyclic alkenes is realized in high efficiency. When a chiral cobalt/bis(phosphine) complex is used instead, the alternative ring‐opening products can be obtained
Retro-Diels−Alder Reaction: Possible Involvement in the Metabolic Activation of 7-Oxabicyclo[2.2.1]hepta-2(3),5(6)-diene-2,3-dicarboxylates and a Phosphonate Analog
作者:Mahmoud Mahajna、Gary B. Quistad、John E. Casida
DOI:10.1021/tx950127f
日期:1996.1.1
toxicity (ip LD50's = 15-50 mg/kg) is restored in oxabicyclohepta-2(3),5(6)-dienes substituted in the 2- and 3-positions with bis(methyl carboxylate), bis(ethyl carboxylate), and diethyl phosphonate/ethyl carboxylate, whereas the dicarboxylic acid, bis(tert-butyl carboxylate), and bis(dimethyl phosphonate) are inactive. The diene adducts do not inhibit the cantharidin binding site of PP2A. Two observations