[EN] 3-PHENYL-7-HYDROXY-ISOCOUMARINS AS MACROPHAGE MIGRATION INHIBITORY FACTOR (MIF) INHIBITORS<br/>[FR] 3-PHÉNYL-7-HYDROXY-ISOCOUMARINES SERVANT D'INHIBITEURS DU FACTEUR D'INHIBITION DE LA MIGRATION DES MACROPHAGES
申请人:PROVOST FELLOWS & SCHOLARS COLLEGE OF THE HOLY UNDIVIDED TRINITY OF QUEEN ELIZABETH NEAR DUBLIN
公开号:WO2015144911A1
公开(公告)日:2015-10-01
This invention relates to 3-phenyl-7-hydroxy-isocoumarin compounds which are MIF inhibitors, compositions comprising said inhibitors and methods for treating or preventing diseases associated with MIF.
Ready Access to Benzannulated [5,5]-Oxaspirolactones Using Au(III)-Catalyzed Cascade Cyclizations
作者:Yash Mankad、Sagar S. Thorat、Pronay Das、Gamidi Rama Krishna、Ravindar Kontham、D. Srinivasa Reddy
DOI:10.1021/acs.joc.1c02843
日期:2022.3.4
showcases an unprecedented Au(III)-catalyzed cascade cyclization of 2-(4-hydroxyalkynyl)benzoates to access benzannulated [5,5]-oxaspirolactones related to biologically active natural products. This reaction proceeds through an initial 5-endo-dig mode of hydroalkoxylation of the alkynol segment to give the oxocarbenium species (via cyclic enol-ether) followed by the addition of carboxylate onto the oxocarbenium
A general and efficient lactonization method of readily available 2-alkynylbenzoates affording biologically important isochromenones has been realized via a solely BF3 center dot Et2O-mediated 6-endo-dig cyclization process under mild conditions. An alternative mechanistic pathway in which BF3 center dot Et2O activates the carbonyl of the ester moiety, rather than the alkyne triple bond, was postulated on the basis of control experiment results. Gram-scale reaction and further application for the assembly of more complex molecules demonstrated the practicability of the protocol.