Cross-Coupling of Mesylated Phenol Derivatives with Potassium Cyclopropyltrifluoroborate
作者:Gary A. Molander、Floriane Beaumard、Terren K. Niethamer
DOI:10.1021/jo2015246
日期:2011.10.7
C-O activation of mesylates by a palladium catalyst and subsequent cross-coupling with potassium cyclopropyltrifluoroborate have been achieved with high yield. Both electron-enriched and electron-deficient aryl mesylates are suitable electrophilic partners for the Suzuki-Miyaura reaction. The scope was successfully extended to heteroaryl mesylates with yields up to 94%.
Synthesis and biological evaluation of enantiomerically pure cyclopropyl analogues of combretastatin A4
作者:Nancy Ty、Renée Pontikis、Guy G. Chabot、Emmanuelle Devillers、Lionel Quentin、Stéphane Bourg、Jean-Claude Florent
DOI:10.1016/j.bmc.2012.11.056
日期:2013.3
combretastatin A4 (CA4) analogues, we have prepared several cyclopropyl compounds in their pureenantiomeric forms. The key reactions in our synthesis are the cyclopropanation of a (Z)-alkenylboron compound bearing a chiral auxiliary, and the cross-coupling of both enantiomeric cyclopropyl trifluoroborate salts with aryl and olefinic halides. Three pairs of cis-cyclopropyl CA4 analogues were evaluated for