A series of aliphatic and benzylic bifunctional boronate esters have been prepared as potential ligands for affinity chromatography. Alpha-Acetamido, picolino, thioureido and acetamidino boronates have the hetero atom coordinated with the boron, creating a tetrahedral structure. The H-1, C-13 and B-11 NMR for these compounds confirm the structure, as well as the hetero atom-boron coordination, and show that the bonding of the internal Lewis base with boron increases in order of coordination strength: pyridine < acetamido < thiourea < acetamidine. Bifunctional boronate esters containing these alpha-substituents and phenoxy ether or dimethylaminophenoxy ether groups, which can be coupled to a solid matrix via a diazonium bond, were prepared.
作者:Marek Biedrzycki、William H. Scouten、Zenobia Biedrzycka
DOI:10.1016/0022-328x(92)83330-k
日期:1992.7
A series of aliphatic and benzylic bifunctional boronate esters have been prepared as potential ligands for affinity chromatography. Alpha-Acetamido, picolino, thioureido and acetamidino boronates have the hetero atom coordinated with the boron, creating a tetrahedral structure. The H-1, C-13 and B-11 NMR for these compounds confirm the structure, as well as the hetero atom-boron coordination, and show that the bonding of the internal Lewis base with boron increases in order of coordination strength: pyridine < acetamido < thiourea < acetamidine. Bifunctional boronate esters containing these alpha-substituents and phenoxy ether or dimethylaminophenoxy ether groups, which can be coupled to a solid matrix via a diazonium bond, were prepared.
The preparation and reactions of esters of dichloromethaneboronic acid
作者:Michael W. Rathke、Esther Chao、Grace Wu
DOI:10.1016/s0022-328x(00)80606-3
日期:1976.12
Dichloromethaneboronic acid is obtained in impure form from the reaction of dichloromethyllithium with trimethylborate. Reaction with the appropriate alcohols furnishes the 1,3 propandiol ester and the diisopropyl ester. Diisopropyldichloromethaneboronate reacts with organolithium or organomagnesiumreagents to give substitution products which can be oxidized to aldehydes.