Genetic Encoding of Bicyclononynes and <i>trans</i>-Cyclooctenes for Site-Specific Protein Labeling in Vitro and in Live Mammalian Cells via Rapid Fluorogenic Diels–Alder Reactions
作者:Kathrin Lang、Lloyd Davis、Stephen Wallace、Mohan Mahesh、Daniel J. Cox、Melissa L. Blackman、Joseph M. Fox、Jason W. Chin
DOI:10.1021/ja302832g
日期:2012.6.27
site-specific labeling of proteins with diverse probes remains an outstanding challenge for chemical biologists. Enzyme-mediated labeling approaches may be rapid but use protein or peptide fusions that introduce perturbations into the protein under study and may limit the sites that can be labeled, while many “bioorthogonal” reactions for which a component can be geneticallyencoded are too slow to effect
Bicyclo[6.1.0]nonyne and tetrazine amino acids for Diels–Alder reactions
作者:Xu Li、Zhengkun Liu、Shouliang Dong
DOI:10.1039/c7ra08136g
日期:——
novo synthesis of a bicyclo[6.1.0]nonyne group containing an aminoacid, and used Marfey's reagent for chiral analysis. This unnatural aminoacid offered exceptional reactivity in the inverse electron demand Diels–Alder cycloaddition with tetrazine containing aminoacids. The subsequent selective labeling of living cells at low dye concentrations demonstrated the usefulness of the new aminoacid for
Versatile electrooxidative amino- and oxyselenation of alkenes
作者:Renjie Wang、Nana Zhang、Yonghong Zhang、Bin Wang、Yu Xia、Kai Sun、Weiwei Jin、Xinyong Li、Chenjiang Liu
DOI:10.1039/d3gc00837a
日期:——
Herein, we describe a general and eco-friendly electrochemical methodology for amino- and oxyselenation of alkenes under transition-metal catalyst- and additional-oxidant-free conditions. This electrocatalytic difunctionalisation reaction exhibits excellent chemoselectivity, ample substrate scope, and high functional group tolerance. To our delight, the selenation products (118 examples, up to 99%
在此,我们描述了一种通用且环保的电化学方法,用于在无过渡金属催化剂和无额外氧化剂的条件下对烯烃进行氨基和氧硒化。这种电催化双官能化反应表现出优异的化学选择性、广泛的底物范围和高官能团耐受性。令我们高兴的是,硒化产物(118 个例子,高达 99% 的产率)由各种烯烃构成,包括具有挑战性的 1-芳基-1,3-二烯、未活化的脂肪族烯烃和各种以 N 或 O 为中心的亲核试剂。进行了初步的机理研究。生物活性分子的克级合成和后期修饰突出了该协议的实用性。
Photoswitchable Oxidopyrylium Ylide for Photoclick Reaction with High Spatiotemporal Precision: A Dynamic Switching Strategy to Compensate for Molecular Diffusion
3-diaryl indenone epoxide (DIO) and mesoionic oxidopyryliumylide (PY) is governed by dual-λ gating, in which PY can undergo fast [5+2] cycloaddition with BCN. A photoswitchablestrategy for photoclick labeling with spatiotemporal control was developed, recycling the unreacted PY to minimize side-effects. Also, moleculardiffusion of the reactive PY was compensated for by improvement of the spatial accuracy