Alkene Isomerization–Hydroboration Promoted by Phosphine-Ligated Cobalt Catalysts
摘要:
Generated in situ from air-stable cobalt precursors or readily synthesized using NaHBEt3, (PPh3)(3)CoH(N-2) was found to be an effective catalyst for the hydroboration of alkenes. Unlike previous base-metal catalysts for alkene isomerizationhydroboration which favor the incorporation of boron at terminal positions, (PPh3)(3)CoH(N-2) promotes boron incorporation adjacent to pi-systems even in substrates where the alkene is at a remote position, enabling a unique route to 1,1-diboron compounds from alpha,omega-dienes.
Alkene Isomerization–Hydroboration Promoted by Phosphine-Ligated Cobalt Catalysts
作者:Margaret L. Scheuermann、Elizabeth J. Johnson、Paul J. Chirik
DOI:10.1021/acs.orglett.5b01135
日期:2015.6.5
Generated in situ from air-stable cobalt precursors or readily synthesized using NaHBEt3, (PPh3)(3)CoH(N-2) was found to be an effective catalyst for the hydroboration of alkenes. Unlike previous base-metal catalysts for alkene isomerizationhydroboration which favor the incorporation of boron at terminal positions, (PPh3)(3)CoH(N-2) promotes boron incorporation adjacent to pi-systems even in substrates where the alkene is at a remote position, enabling a unique route to 1,1-diboron compounds from alpha,omega-dienes.
Copper-Catalyzed Oxidative Acetalization of Boronic Esters: An Umpolung Strategy for Cyclic Acetal Synthesis
作者:Eric M. Miller、Maciej A. Walczak
DOI:10.1021/acs.joc.0c00720
日期:2020.6.19
copper, and the conditions proved to be mild and were amenable to a variety of functional groups. We expanded the Chan–Lam coupling to include C(sp3) nucleophiles and converted them into corresponding acetals. This method allows for the orthogonal acetalization of substrates with reactive, acid-sensitive functional groups.