Presented is the first enantioselective copper‐catalyzed 1,6‐conjugateaddition of bis(pinacolato)diboron to para‐quinonemethides. The reaction proceeds with excellent yields and good to excellent enantioselectivities, and provides an attractive approach to the construction of optically active gem‐diarylmehtine boronic esters. Additionally, the subsequent conversion of the derived potassium trifluoroborates
Synthesis of Enantioenriched Triarylmethanes by Stereospecific Cross-Coupling Reactions
作者:Buck L. H. Taylor、Michael R. Harris、Elizabeth R. Jarvo
DOI:10.1002/anie.201202527
日期:2012.7.27
Coupling with inversion: Chiral diarylmethanol derivatives undergo a stereospecific nickel‐catalyzed cross‐couplingreaction with aryl Grignard reagents (see scheme). The reaction proceeds with inversion of configuration and high enantiospecificity. The method has been applied to the asymmetric synthesis of a triarylmethane‐based anti‐cancer compound.
Nickel-Catalyzed Cross-Couplings of Benzylic Pivalates with Arylboroxines: Stereospecific Formation of Diarylalkanes and Triarylmethanes
作者:Qi Zhou、Harathi D. Srinivas、Srimoyee Dasgupta、Mary P. Watson
DOI:10.1021/ja312087x
日期:2013.3.6
We have developed a stereospecific nickel-catalyzed cross-coupling of benzylic pivalates with arylboroxines. The success of this reaction relies on the use of Ni(cod)(2) as the catalyst and NaOMe as a uniquely effective base. This reaction has broad scope with respect to the arylboroxine and benzylic pivalate, enabling the synthesis of a variety of diarylalkanes and triarylmethanes in good to excellent yields and ee's.