Catalytic regeneration of a Th–H bond from a Th–O bond through a mild and chemoselective carbonyl hydroboration
作者:Tapas Ghatak、Konstantin Makarov、Natalia Fridman、Moris S. Eisen
DOI:10.1039/c8cc05030a
日期:——
Here we present an unprecedented chemoselectivehydroboration for aldehydes and ketones catalysed by actinides. The reaction features a very low catalyst loading (0.1–0.004 mol%) and quantitative product formation in less than 15 minutes, at room temperature. Thermodynamic and kinetic studies including stoichiometric and labeling studies with deuterated pinacolborane allow us to propose a plausible
HC═NR skeleton. The reactions of HL1 with MeLi, sec-BuLi, and tert-BuLi, respectively, were also examined. The products for both the nucleophilic addition of organolithium reagents to the C═N bond and α-C–H substitution of the HC═NR moiety of the HL1 ligand were determined. The mechanisms for the formations of 2 and 3 were rationalized by DFT calculations. The hydroboration reactions catalyzed by 2 were
Catalytic hydroboration of carbonyl derivatives by using phosphinimino amide ligated magnesium complexes
作者:Min Li、Xinli Liu、Dongmei Cui
DOI:10.1039/d1dt00143d
日期:——
phenyl ring of the ligand showed excellent reduction capability for a broad range of carbonyl derivatives under mild reaction conditions. Aldehydes, ketones, and acrolein substrates were efficiently reduced to the corresponding alkoxy-borane products with a record high TOF. Besides, acrolein derivatives were exclusively reduced to 1,2-regioselective products. Using two equiv. of HBpin, ester substrates
Rapid, Mild, and Selective Ketone and Aldehyde Hydroboration/Reduction Mediated by a Simple Lanthanide Catalyst
作者:Victoria L. Weidner、Christopher J. Barger、Massimiliano Delferro、Tracy L. Lohr、Tobin J. Marks
DOI:10.1021/acscatal.6b03332
日期:2017.2.3
Rapid, clean hydroboration of ketones and aldehydes with HBpin is achieved using the homoleptic rare-earth catalyst La[N(SiMe3)2]3 (LaNTMS). The reaction employs low catalyst loadings (0.01–1 mol % LaNTMS), proceeds rapidly (>99% in 5 min) at 25 °C, and is moderately air-tolerant. Additionally, this hydroboration has good functional group compatibility, including halides, nitro groups, and nitriles
Hydroboration of Aldehydes, Ketones, and Carbodiimides Promoted by Mono(imidazolin‐2‐iminato) Hafnium Complexes
作者:Maxim Khononov、Natalia Fridman、Matthias Tamm、Moris S. Eisen
DOI:10.1002/ejoc.201901750
日期:2020.6.8
The synthesis and characterization of a new series of highly oxophilic mono(imidazolin‐2‐iminato)hafnium tribenzyl complexes is presented. Those complexes were found to be active catalysts promoting the hydroboration of aldehydes, ketones, and the selective monohydroboration of carbodiimides with HBpin.