<i>trans</i>
‐Hydroboration of Propargyl Alcohol Derivatives and Related Substrates
作者:Lauren E. Longobardi、Alois Fürstner
DOI:10.1002/chem.201902228
日期:2019.8
in good to excellent levels of regio‐ as well as stereoselectivity, provided that the triple bond bears one linear and one singly‐branched substituent. In such cases, the reaction follows an unusual trans‐addition mode and places the boron entity distal to the branching point. The resulting alkenyl boronates, which are difficult to make otherwise, can be engaged in numerous enabling downstream processes
On the regioselectivity of Pd-catalyzed additions of organoboronic acids to unsymmetrical alkynes
作者:Nakjoon Kim、Ki Seong Kim、Aruna Kumar Gupta、Chang Ho Oh
DOI:10.1039/b316446b
日期:——
The Pd-catalyzed reaction of unsymmetrical alkynes with organoboronicacids gave a mixture of products and, whose ratios were controlled by the electronic as well as steric effects of the substrates.
Here we reported the iridium-catalyzed hydrosilylation of internalalkynes under simple and mild conditions. The intrinsic functional groups of alkyne substrates were disclosed to be crucial in facilitating both the hydrosilylation process and related regioselectivity owing to their coordination capability towards the iridium catalyst. Utilization of the steric trimethylsilyl-protected trihydroxysilane