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.