39493-30-6Relevant articles and documents
Asymmetric synthesis and structure-activity studies of the fungal metabolites colletorin A, colletochlorin A and their halogenates analogues
Marsico, Giulia,Pignataro, Barbara A.,Masi, Marco,Evidente, Antonio,Casella, Francesca,Zonno, Maria Chiara,Tak, Jun-Hyung,Bloomquist, Jeffrey R.,Superchi, Stefano,Scafato, Patrizia
, p. 3912 - 3923 (2018/06/08)
The first asymmetric total synthesis of both enantiomers of the natural products colletorin A and colletochlorin A is presented. The proposed methodology is based on the coupling reaction between highly substituted aromatic Gilman cuprates and optically active allyl bromides, in turn obtained by Sharpless asymmetric dihydroxylation. The latter ensured a high degree of regio- and stereocontrol in the enantioselective step of the synthesis. The same synthetic strategy has been also applied for the preparation of differently halogenated synthetic analogues of colletochlorin A in high enantiomeric purity. The enantioselective synthesis of colletorin A and colletochlorin A allows to reliably assign their absolute configuration. Preliminary assessment of their herbicidal and insecticidal properties evidence the possibility to modulate the bioactivity of these compounds, highlighting its dependence on both the absolute stereochemistry and the halogen nature.
Cyclization reactions leading to β-hydroxyketo esters
Nicholson,Edafiogho,Moore,Farrar,Scott
, p. 76 - 78 (2007/10/02)
The purpose of the research was to synthesize β-diketo esters and to evaluate them for anticonvulsant activity. The reaction of methyl vinyl ketone with dimethyl malonate in the presence of potassium carbonate gave an uncyclized product that underwent a Claisen condensation to yield methyl 2- hydroxy-4-oxocyclohex-2-en-1-oate (5a). Similarly, other cyclized β- hydroxyketo esters were prepared, and their spectrometric data confirmed that the enol tautomers were preferred to the β-diketo tautomers. The synthetic work clarified the reaction pathway for the Michael addition of malonate esters to enones. Of the intermediates and products tested for anticonvulsant activity, dimethyl 2,2-bis-(3-oxobutyl)malonate (9a) was found to possess anticonvulsant property. However, it is emphasized that the β-hydroxyketo esters could be useful intermediates in the synthesis of enaminone anticonvulsants.
A GENERAL HIGHLY EFFICIENT ACCESS TO PRENYLATED PHENOLIC NATURAL PRODUCTS. SYNTHESIS OF COLLETOCHLORINS B AND D
Saimoto, Hiroyuki,Hiyama, Tamejiro
, p. 597 - 600 (2007/10/02)
A general approach is reported for the synthesis of phenolic natural products having terpenoid side chains: (1) construction of the requisite bromophenol ethers, (2) coupling the aromatic ring with a terpenoid chain through copper(I) ate complex, and (3)
