Aldehyde Capture Ligation for Synthesis of Native Peptide Bonds
作者:Monika Raj、Huabin Wu、Sarah L. Blosser、Marc A. Vittoria、Paramjit S. Arora
DOI:10.1021/jacs.5b03538
日期:2015.6.3
reactions for amide bondformation have transformed the ability to access synthetic proteins and other bioconjugates through ligation of fragments. In these ligations, amide bondformation is accelerated by transient enforcement of an intramolecular reaction between the carboxyl and the amine termini of two fragments. Building on this principle, we introduce an aldehyde capture ligation that parlays
of nano-Fe3O4@GO over pristine nano-Fe3O4 is established. The formation of C–Se and C–Te bonds is of synthetic and biological importance. Graphene oxide based nano-Fe3O4 (nano-Fe3O4@GO) is used as a reusable catalyst for the efficient synthesis of diselenides and ditellurides, through crosscoupling of Se(0) or Te(0) with aryl iodides. The magnetic heterogeneous catalyst could be easily recovered and
摘要 C-Se和C-Te键的形成具有合成和生物学重要性。通过Se(0)或Te(0)与芳基碘化物的交叉偶联,基于氧化石墨烯的纳米Fe 3 O 4(nano-Fe 3 O 4 @GO)可作为可重复使用的催化剂,用于高效合成二硒化物和二碲化物。 。磁性多相催化剂可以容易地回收和重复使用多次,而不会显着降低催化活性。此外纳米Fe的优越性3 ö 4 @GO超过原始纳米的Fe 3 ö 4成立。 C-Se和C-Te键的形成具有合成和生物学重要性。通过Se(0)或Te(0)与芳基碘化物的交叉偶联,基于氧化石墨烯的纳米Fe 3 O 4(nano-Fe 3 O 4 @GO)可作为可重复使用的催化剂,用于高效合成二硒化物和二碲化物。 。磁性多相催化剂可以容易地回收和重复使用多次,而不会显着降低催化活性。此外纳米Fe的优越性3 ö 4 @GO超过原始纳米的Fe 3 ö 4成立。
three-component reaction of alkynylaryl ketones bearing an ortho-methoxy group, element selenium, and arylboronic acid, providing a facile route to selenofunctionalized chromone products has been developed. This protocol features high efficiency and high regioselectivity, and the use of selenium powder as the selenium source. Mechanistic experiments indicated that the combined oxidative effect of (bis(tri
A metal-free protocol is disclosed for C-Se and Se-Se bonds forming reactions between boronic acids and elemental selenium to synthesize diselenides by using TMSCN as an organic catalyst. Meanwhile, a series of ditellurides were obtained from boronic acids and elemental tellurium with TMSCN. Preliminary mechanistic studies reveal that the reaction involved a radical way.