HandaPhos: A General Ligand Enabling Sustainable ppm Levels of Palladium-Catalyzed Cross-Couplings in Water at Room Temperature
作者:Sachin Handa、Martin P. Andersson、Fabrice Gallou、John Reilly、Bruce H. Lipshutz
DOI:10.1002/anie.201510570
日期:2016.4.11
complexed in a 1:1 ratio with Pd(OAc)2, enables Pd‐catalyzed cross‐couplings to be run using ≤1000 ppm of this pre‐catalyst. Applications to Suzuki–Miyaura reactions involving highly funtionalized reaction partners are demonstrated, all run using environmentally benign nanoreactors in water at ambient temperatures. Comparisons with existing state‐of‐the‐art ligands and catalysts are discussed herein.
Ligand-Accelerated Stereoretentive Suzuki–Miyaura Coupling of Unprotected 3,3′-Dibromo-BINOL
作者:Bo Qu、Nizar Haddad、Sonia Rodriguez、Joshua D. Sieber、Jean-Nicolas Desrosiers、Nitinchandra D. Patel、Yongda Zhang、Nelu Grinberg、Heewon Lee、Shengli Ma、Uwe Jörg Ries、Nathan K. Yee、Chris H. Senanayake
DOI:10.1021/acs.joc.5b02368
日期:2016.2.5
An efficient synthesis of the enantiomerically pure 3,3'-bis-arylated BINOL derivatives is accomplished through the palladium-catalyzed Suzuki-Miyaura coupling of the unprotected 3,3'-dibromo-BINOL with complete retention of enantiopurity. The active catalyst system Pd(OAc)(2)/BI-DIME has enabled mild reaction conditions at palladium loads as low as 500 ppm.