of aryl cyanides with diboron in the presence of a rhodium/Xantphos catalyst and DABCO affords arylboronic esters via carbon-cyano bond cleavage. This unprecedented mode of reactivity for a borylrhodium species allows the regioselective introduction of a boryl group in a late stage of synthesis.
Unsymmetrical diborane(4) derivatives by copper mediated B–B coupling
作者:W. Oschmann、C. Borner、C. Kleeberg
DOI:10.1039/c8dt00627j
日期:——
A novel, versatile and modular route to unsymmetrical diborane(4) derivatives bearing either two different diol moieties or one diol and one diamine moiety is presented. Utilising the very basic approach of reacting a boron nucleophile with a boron electrophile to establish the B–B bond allows a simple variation of the two individual boron moieties. The copper(I) boryl complexes used as nucleophilic
A BBr3-mediated S-directed ortho C–H borylation of thiobenzamides was developed. A variety of ortho-borylated thiobenzamides were obtained in moderate to good yields with a wide functional group tolerance under simple and metal-free conditions. This transformation provided a convenient and practical route to important functionalized thiobenzamides.