Traceless Stereoinduction for the Enantiopure Synthesis of Substituted-2-Cyclopentenones
摘要:
The pseudoenantiomeric 4-O-Boc- and 4-OPMP-cyclopent-2-enones, readily available from hydroxymethylenefurane on multigram scale, are demonstrated to be exceptional building blocks for the synthesis of enantiopure 4-alkyl-5-(1'-hydroxyalkyl) substituted 2-cyclopentenones and derivatives thereof. The 4-OR substituent acts as a traceless stereoinducing element, conferring not only 1,2- but also 1,4-stereocontrol with excellent selectivity. The methodology developed here was applied for the rapid synthesis of natural products and biologically active 2-cyclopentenones such as TEI-9826, guaianes, and pseudoguaianolides.
[EN] TOTAL SYNTHESIS OF PROSTAGLANDIN J NATURAL PRODUCTS BY STEREORETENTIVE METATHESIS<br/>[FR] SYNTHÈSE TOTALE DE PRODUITS NATURELS DE PROSTAGLANDINE J PAR MÉTATHÈSE STÉRÉORÉTENTIVE
申请人:CALIFORNIA INST OF TECHN
公开号:WO2019222244A1
公开(公告)日:2019-11-21
This invention relates generally to the synthesis of Δ12-Prostaglandin J product using stereoretentive ruthenium olefin metathesis catalysts supported by dithiolate ligands. Δ12- Prostaglandin J products were generated with excellent selectivity (>99% Z) and in moderate to high/good yields (47% to 80% yield; 58% to 80% yield).
Racemic 4-hydroxycyclopentenone, readily derivedfrom furfuryl alcohol, can be transformed viaits O-Boc derivative to 4-acyloxy, 4-aryloxy-, 4-amino-, or 4-thio-substituted cyclopentenones with high enantioselectivity by palladium-catalyzed kinetic resolution via nucleophilic allylic substitutions. Applying this methodology, a short formal synthesis of ent-noraristeromycin was readily accomplished