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.
Rhodium catalysed dehydrogenative borylation of alkenes: Vinylboronates via C–H activation
作者:Ibraheem A. I. Mkhalid、R. Benjamin Coapes、S. Natasha Edes、David N. Coventry、Fabio E. S. Souza、Rhodri Ll. Thomas、Jonathan J. Hall、Si-Wei Bi、Zhenyang Lin、Todd B. Marder
DOI:10.1039/b715584k
日期:——
We present herein a high yield, highly selective catalytic synthesis of vinylboronate esters (VBEs), including 1,1-disubstituted VBEs, from alkenes without significant hydrogenation or hydroboration, using the simple catalyst precursor, trans-[RhCl(CO)(PPh3)2] (1), and the diboron reagents B2pin2 (2a, pin = pinacolato = OCMe2CMe2O) or B2neop2 (2b, neop = neopentylglycolato = OCH2CMe2CH2O), or the monoboron