N-Heterocyclic Carbene-Catalyzed Hydrosilylation of Styryl and Propargylic Alcohols with Dihydrosilanes
作者:Qiwu Zhao、Dennis P. Curran、Max Malacria、Louis Fensterbank、Jean-Philippe Goddard、Emmanuel Lacôte
DOI:10.1002/chem.201101822
日期:2011.8.29
Reducing alkenes to tears: Addition of structurally diverse N‐heterocyclic carbenes (NHCs) to silicon allows the reduction of propargylic and styryl alcohols through an organocatalyzed silylation/direct hydride transfer tandem reaction (see scheme). Catalytic turnover is enabled by the switch to and from hypervalent silicon. This provides a new synthetic application of NHC–main group element complexes
Enantioselective C3‐Allylation of Pyridines via Tandem Borane and Palladium Catalysis
作者:Jun‐Jie Tian、Rui‐Rui Li、Gui‐Xiu Tian、Xiao‐Chen Wang
DOI:10.1002/anie.202307697
日期:2023.8.21
A one-pot, three-step method for highly enantioselective C3-allylation reactions of pyridines was developed. The method involved borane-catalyzed dearomative pyridine hydroboration, palladium-catalyzed enantioselective allylation of the dearomatized intermediate, and finally oxidation by air. The method was applicable to a broad range of pyridines, N-heteroarenes, and allylic esters.
Palladium-catalyzed stereospecific cross-coupling of enantioenriched allylic alcohols with boronic acids
作者:Hai-Bian Wu、Xian-Tao Ma、Shi-Kai Tian
DOI:10.1039/c3cc45772a
日期:——
In the presence of 2.5 mol% Pd2(dba)3–TMEDA (1 : 4), a range of enantioenriched allylic alcohols smoothly coupled with boronic acids in a highly regioselective fashion with inversion of configuration to afford structurally diverse alkenes in good yields with perfect retention of ee.