Lithium compound catalyzed deoxygenative hydroboration of primary, secondary and tertiary amides
作者:Milan Kumar Bisai、Kritika Gour、Tamal Das、Kumar Vanka、Sakya S. Sen
DOI:10.1039/d1dt00364j
日期:——
route for the deoxygenative reduction of primary to tertiary amides to corresponding amines has been achieved with pinacolborane (HBpin) using simple and readily accessible 2,6-di-tert-butyl phenolate lithium·THF (1a) as a catalyst. Both experimental and DFT studies provide mechanistic insight.
Enantioselective Alkyne Conjugate Addition Enabled by Readily Tuned Atropisomeric <i>P</i>,<i>N</i>-Ligands
作者:Sourabh Mishra、Ji Liu、Aaron Aponick
DOI:10.1021/jacs.7b00363
日期:2017.3.8
structure, the 5-membered chiral biaryl heterocyclic scaffold represents a departure from 6-membered P,N-ligands that facilitates tuning and enables ligand evolution to address issues of selectivity and reactivity. In this vein, the Cu-catalyzedenantioselective conjugate alkynylation of Meldrum's acid acceptors is reported using Me-StackPhos. Enabled by this new ligand, the reaction tolerates a wide range
A practical route to fluoroalkyl- and fluoroarylamines by base-catalyzed [1,3]-proton shift reaction
作者:Vadim A. Soloshonok、Alexander G. Kirilenko、Valery P. Kukhar、Giuseppe Resnati
DOI:10.1016/s0040-4039(00)76845-6
日期:1994.5
The base-catalyzed [1,3]-protonshiftreaction is shown to be an efficient general approach to fluoroalkyl and fluoroaryl amines starting from appropriate carbonyl compounds and benzylamine.
Exploiting Non-Covalent Interactions in Synthesis: Macrocyclization Employing Amide-Based Auxiliaries
作者:Yassir El-Azizi、Joseph E. Zakarian、Lisa Bouillerand、Andreea R. Schmitzer、Shawn K. Collins
DOI:10.1002/adsc.200800365
日期:2008.10.6
Efficient macrocyclic olefin and en-yne metathesis can be conducted employing benzyl ester auxiliaries that engage in quadrupolar interactions. The use of amide linkers in place of esters results in higher overall yields. Computational studies suggest that amide auxiliaries stabilize conformers conducive to macrocyclization over 22 times more efficiently than an ester linkage. Molecular modelling studies
The position of an anion above an electron-deficient arene can be controlled by the geometry of appended directing groups. Here a series of ammonium substituted pentafluorophenyl derivatives is investigated. The presented results are one step on the way to find the ideal structural features for an effective and superior receptor for anion–π studies.