Various pyrrole derivatives are synthesized from γ,δ-unsaturated ketone O-pentafluorobenzoyloximes by treatment with catalytic amounts of Pd(PPh3)4 and triethylamine via alkylideneaminopalladium(II...
The synthesis of lyngbic acid and both hermitamides A and B, three compounds previously isolated from Lyngbya majuscula has been achieved by a cross-metathesis between 4-methoxyundec-1-ene with pent-4-enoic acid or its amides. The reaction proceeds smoothly to deliver the target molecules in appreciable yields and with a very high E selectivity as determined by NMR experiments. Allyltransfer using
Sequential cross-metathesis/cyclopropanation: short syntheses of (+/−)-cascarillic acid and (+/−)-grenadamide
作者:Hani Salim、Olivier Piva
DOI:10.1016/j.tetlet.2007.01.152
日期:2007.3
The total synthesis of (+/−)-cascarillic acid has been achieved by a sequential cross-metathesis/Simmons–Smithcyclopropanation between, respectively, 1-octene with an appropriate unsaturated carboxylic acid. In parallel, a direct access to grenadamide was developed from 1-nonene with a readily available unsaturated amide. In both cases, the chemical yields were high (up to 98%) and the E/Z ratio was
A novel cycloisomerisation of oximes bearing non-activated C-C double bonds occurs in an Al(III)-catalysed reaction. This process leads to 5-,6- and 7-membered ring oxygen and nitrogen-containing heterocycles in good yields. (C) 2008 Elsevier Ltd. All rights reserved.
Repurposing the 3‐Isocyanobutanoic Acid Adenylation Enzyme SfaB for Versatile Amidation and Thioesterification
作者:Mengyi Zhu、Lijuan Wang、Jing He
DOI:10.1002/anie.202010042
日期:2021.1.25
molecules with novel skeletons, but also to identify the enzymes that catalyze diverse chemical reactions. Exploring the substrate promiscuity and catalytic mechanism of those biosynthetic enzymes facilitates the development of potential biocatalysts. SfaB is an acyladenylate‐forming enzyme that adenylates a unique building block, 3‐isocyanobutanoic acid, in the biosynthetic pathway of the diisonitrile