iron(III) acetoacetate (Fe(acac)3) and tetramethylethylenediamine (TMEDA) enables the direct cross-coupling of alkyl halides with bis(pinacolato)diboron. This approach allows for the borylation of activated or unactivated primary, secondary, and tertiary bromides. Moreover, even the borylation of benzylic or allylic chlorides, tosylates, and mesylates are possible. The reactions proceed under mild conditions
Alkylboronic Esters from Palladium- and Nickel-Catalyzed Borylation of Primary and Secondary Alkyl Bromides
作者:Jun Yi、Jin-Hui Liu、Jun Liang、Jian-Jun Dai、Chu-Ting Yang、Yao Fu、Lei Liu
DOI:10.1002/adsc.201200136
日期:2012.6.18
Palladium‐ and nickel‐catalyzed cross‐coupling recations of unactivated alkyl bromides with diboron reagents have been developed as practical methods for the synthesis of primary and secondaryalkylboronic esters. These reactions extend the concept and utility of Pd‐ and Ni‐catalyzed cross‐coupling of aliphatic electrophiles. They also show different substrate selectivity and ligand dependence as compared
Palladium-Catalyzed Borylation of Primary Alkyl Bromides
作者:Amruta Joshi-Pangu、Xinghua Ma、Mohamed Diane、Sidra Iqbal、Robert J. Kribs、Richard Huang、Chao-Yuan Wang、Mark R. Biscoe
DOI:10.1021/jo301156e
日期:2012.8.3
bromides react with complete selectivity in the presence of a secondary bromide. The generality of this approach is demonstrated by its extension to the use of alkyl iodides and alkyl tosylates, as well as borylation reactions employing bis(neopentyl glycolato)diboron as the boron source.