Rhodium-catalyzed borylation reactions of aryl and alkenyl pivalates, using a diboron reagent, via the cleavage of carbon–oxygen bonds have been developed. The inert nature of the pivalate moiety enables relatively complex aryl boronates to be synthesized via the tandem cross-coupling of carbon–halogen and carbon–oxygen bonds.
Nickel-Catalyzed Reductive and Borylative Cleavage of Aromatic Carbon–Nitrogen Bonds in N-Aryl Amides and Carbamates
作者:Mamoru Tobisu、Keisuke Nakamura、Naoto Chatani
DOI:10.1021/ja501649a
日期:2014.4.16
The nickel-catalyzed reaction of N-aryl amides with hydroborane or diboron reagents resulted in the formation of the corresponding reduction or borylation products, respectively. Mechanistic studies revealed that these reactions proceeded via the activation of the C(aryl)-N bonds of simple, electronically neutral substrates and did not require the presence of an ortho directinggroup.
Direct Borylation of Tertiary Anilines via C–N Bond Activation
作者:Zhi-Chao Cao、Xiao-Lei Li、Qin-Yu Luo、Huayi Fang、Zhang-Jie Shi
DOI:10.1021/acs.orglett.8b00545
日期:2018.4.6
The first successful catalytic borylation of unactivated aromatic C–N bonds of tertiary anilines without the preactivation or any directing groups is demonstrated. The reactivity of both N,N-dialkylarylamines and N-arylpyrroles were investigated systematically, and the targeted products were furnished in moderate to good yields. The DFT calculation results indicated that the catalytic cycle is furnished