Synthesis and chemoselective ligations of MIDA acylboronates with O-Me hydroxylamines
作者:Hidetoshi Noda、Jeffrey W. Bode
DOI:10.1039/c4sc00971a
日期:——
N-Methyliminodiacetyl (MIDA) acylboronates undergo chemoselective amide-bond forming ligations in water with O-Me hydroxylamines, including unprotected peptide substrates. These bench-stable boronates were easily prepared from potassium acyltrifluoroborates (KATs) in one step. The reactivity of MIDA acylboronates with O-alkylhydroxylamines – which are unreactive with KATs – was attributed to the nature
A General Protocol for the Polycondensation of Thienyl <i>N</i>-Methyliminodiacetic Acid Boronate Esters To Form High Molecular Weight Copolymers
作者:Josue Ayuso Carrillo、Michael L. Turner、Michael J. Ingleson
DOI:10.1021/jacs.6b07666
日期:2016.10.12
(AA-type) monomers in Suzuki–Miyaura copolymerizations with dibromo-heteroarenes (BB-type monomers). A single polymerization protocol is applicable for the formation of five alternating thienyl copolymers that are (or are close analogues of) state of the art materials used in organic electronics. The five polymers were produced in excellent yields and with high molecular weights comparable to those produced
Copper(<scp>i</scp>)-catalysed regio- and diastereoselective intramolecular alkylboration of terminal allenes <i>via</i> allylcopper(<scp>i</scp>) isomerization
作者:Yu Ozawa、Hiroaki Iwamoto、Hajime Ito
DOI:10.1039/c8cc02692k
日期:——
We report the first copper(I)-catalysed intramolecular alkylboration of terminal allenes with an alkyl halide moiety. The reaction provides alkenylboronates bearing a four-membered ring structure with high regio- and diastereocontrol. A possible reaction mechanism is proposed, involving the facile isomerization of an allylcopper(I) intermediate. A DFT study explains the experimental regio- and diastereoselectivity
Thienyl MIDA Boronate Esters as Highly Effective Monomers for Suzuki–Miyaura Polymerization Reactions
作者:Josué Ayuso Carrillo、Michael J. Ingleson、Michael L. Turner
DOI:10.1021/ma502542g
日期:2015.2.24
The synthesis of highly regioregular poly(3-hexylthiophene-2,5-diyl), rr-P3HT, by Suzuki-Miyaura polymerization is reported. The key N-methyliminodiacetic acid (MIDA) boronate ester thienyl monomer was synthesized using a one-pot multigram scale procedure, in high purity, and in good isolated yield (80%) by direct electrophilic borylation. Conditions for the hydrolysis of the MIDA protecting group and the polymerization reaction were investigated. The optimal procedure gave rr-P3HT with >98% HT couplings, excellent isolated yields (up to 94%), and polymer molecular weights up to M-n = 18.7 kDa and M-w = 42.7 kDa. The performance of the MIDA containing monomer was compared to that of the pinacol boronate ester under identical polymerization conditions, with the latter producing lower molecular weight polymers in reduced yield.
Voronkov, M. G.; Vvedenskii, V. Yu., Journal of general chemistry of the USSR, 1987, vol. 57, p. 1397 - 1399