Improved method for the conversion of pinacolboronic esters into trifluoroborate salts: facile synthesis of chiral secondary and tertiary trifluoroborates
作者:Viktor Bagutski、Abel Ros、Varinder K. Aggarwal
DOI:10.1016/j.tet.2009.10.002
日期:2009.11
A general method for the preparation of virtually any potassium trifluoroborate salt from the corresponding pinacolboronic ester is reported. Thus, conditions for an azeotropic removal of pinacol from the reaction mixture were found to afford the desired potassium trifluoroborates of sufficient purity (>95%) in nearly quantitative yields irrespective of the nature of the product. The utility of this
The present invention relates to modulators of muscarinic receptors. The present invention also provides compositions comprising such modulators, and methods therewith for treating muscarinic receptor mediated diseases.
Investigation of the Deprotonative Generation and Borylation of Diamine-Ligated α-Lithiated Carbamates and Benzoates by in Situ IR spectroscopy
作者:Rory C. Mykura、Simon Veth、Ana Varela、Lydia Dewis、Joshua J. Farndon、Eddie L. Myers、Varinder K. Aggarwal
DOI:10.1021/jacs.8b06871
日期:2018.11.7
Diamine-mediated α-deprotonation of O-alkyl carbamates or benzoates with alkyllithium reagents, trapping of the carbanion with organoboroncompounds, and 1,2-metalate rearrangement of the resulting boronate complex are the primary steps by which organoboroncompounds can be stereoselectively homologated. Although the final step can be easily monitored by 11B NMR spectroscopy, the first two steps, which
Enantioselective installation of adjacent tertiary benzylic stereocentres using lithiation–borylation–protodeboronation methodology. Application to the synthesis of bifluranol and fluorohexestrol
作者:Stefan Roesner、Daniel J. Blair、Varinder K. Aggarwal
DOI:10.1039/c4sc03901g
日期:——
Highly hindered benzylic carbamates have been reacted with hindered boronic esters to give tertiary boronic esters with very high diastereo- and enantiocontrol and the methodology has been applied to otherwise difficult-to-access molecules.
Compound of the formula: (I) [wherein each of X
1
, X
2
, and X
3
independently represents N or CH, W represents the formula (II):(II) or the formula (III):(III) and Y represents a group of the formula (IV):(IV)], or a pharmacologically acceptable salt thereof. This compound exhibits histamine receptor H3 antagonist or inverse agonist activity and is useful of the treatment and/or prevention of obesity, diabetes, hormonal secretion abnormality, sleep, disorder, etc.