228717-97-3Relevant articles and documents
A three-component coupling approach to cyclopentanoids
Trost,Pinkerton
, p. 7714 - 7722 (2007/10/03)
A new approach to 2,3-disubstituted cyclopentenones has been developed. This approach consists of a two-step protocol involving the cyclization of a Z-vinyl bromide under Barbier type conditions to form a cyclopentenol, which is then oxidatively rearranged to generate the cyclopentenone. The Z-vinyl bromide is in turn derived from a ruthenium catalyzed three-component coupling of an alkyne, an enone, and a HBr equivalent. A range of 2,3-disubstituted cyclopentenones has been generated, including short syntheses of jasmone and dihydrojasmone. Further applicability of this strategy is shown in the total syntheses of tetrahydrodicranenone B, rosaprostol, and a selective COX-2 inhibitor.
Efficient syntheses of 2-(3',5'-difluorophenyl)-3-(4'- methylsulfonylphenyl)-cyclopent-2-enone, a potent COX-2 inhibitor
Zhao, Dalian,Feng, Xu,Chen, Cheng-yi,Tillyer, Rich D.,Grabowski, Edward J. J.,Reider, Paul J.,Black, Cameron,Quimet, Nathalie,Prasit, Peppi
, p. 6001 - 6018 (2007/10/03)
2-(3',5'-Difluorophenyl)-3-(4'-methylsulfonylphenyl)cyclopent-2-enone (1) displays high selectivity and potency against COX-2. Three efficient syntheses of this diarylcyclopentenone are described. The first approach employs a Suzuki coupling reaction as the key step while the second synthesis features an intramolecular Friedel-Crafts acylation. The third, and preferred route to this compound involves a sequential malonate alkylation and acylation and ring-closure sequence.