Understanding the mechanism of transition metal-free <i>anti</i> addition to alkynes: the selenoboration case
作者:Diego García-López、Marc G. Civit、Christopher M. Vogels、Josep M. Ricart、Stephen A. Westcott、Elena Fernández、Jorge J. Carbó
DOI:10.1039/c7cy02295f
日期:——
The stereoselective anti-addition of selenoboranes to α,β-acetylenic esters and amides was achieved in a transition metal-free context using catalytic amounts of PCy3. The reaction provides anti-3,4-selenoboration with concomitant delivery of α-vinyl selenides by protodeboronation with MeOH. Interestingly, in the absence of phosphine the selenoboration switches towards the formation of β-vinyl selenides