自下而上的蛋白质组学实验通常需要对蛋白水解消化产生的肽的 N 端和/或 C 端进行选择性结合或标记。例如,基于表面荧光成像的技术正在成为一种有前途的高通量蛋白质测序途径,但需要生成通过单个 C 末端连接固定的肽表面阵列,同时保留 N 末端自由。虽然有几种稳健的方法可用于选择性 N 端缀合,但已证明实施选择性标记或 C 端缀合方法更具挑战性,该方法可以区分 C 端羧基和天冬氨酸上的其他羧基和谷氨酸残基。更远,许多基于通过酰胺键形成的共轭的方法需要保护 N 端以避免不必要的交联反应。为了克服这些挑战,我们在此描述了一种新的策略,用于单点选择性固定通过 C 端蛋白酶消化产生的肽。该方法涉及通过赖氨酸氨基酸固定肽,赖氨酸氨基酸天然存在于从某些丝氨酸内切蛋白酶(如 LysC)消化的裂解肽的 C 末端。该赖氨酸和 N 末端是肽片段中唯一的两个伯胺,与包含炔烃手柄的定制异硫氰酸苯酯 (EPITC) 发生
Reaction of Thiocarbonyl Fluoride Generated from Difluorocarbene with Amines
作者:Jiao Yu、Jin-Hong Lin、Ji-Chang Xiao
DOI:10.1002/anie.201710186
日期:2017.12.22
The reaction of thiocarbonyl fluoride, generated from difluorocarbene, with various amines under mild conditions is described. Secondary amines, primary amines, and o‐phenylenediamines are converted to thiocarbamoyl fluorides, isothiocyanates, and difluoromethylthiolated heterocycles, respectively. Thiocarbamoyl fluorides were further transformed into trifluoromethylated amines by using a one‐pot process
Synthesis of Thiocarbamoyl Fluorides and Isothiocyanates Using Amines with CF<sub>3</sub>SO<sub>2</sub>Cl
作者:Jingjing Wei、Shuaishuai Liang、Lvqi Jiang、Wenbin Yi
DOI:10.1021/acs.joc.0c01634
日期:2020.10.2
A practical and efficientmethod to synthesize thiocarbamyl fluorides and isothiocyanates from amines with trifluoromethanesulfonyl chloride was developed. In the presence of the reducing agent triphenylphosphine and sodium iodide, thiocarbamyl fluorides and isothiocyanates were synthesizedfrom secondary/primary amine in moderate to excellent yields, respectively. A broad scope of substrates and good
Organophosphine-free copper-catalyzed isothiocyanation of amines with sodium bromodifluoroacetate and sulfur
作者:Wei Feng、Xing-Guo Zhang
DOI:10.1039/c8cc09190k
日期:——
A new copper-catalyzed isothiocyanation of amines with sodium bromodifluoroacetate and sulfur for the synthesis of isothiocyanates and various heterocycles is described.
A hybrid prodrug was synthesized to realize the combined delivery of nitricoxide and hydrogen sulfide. The NO–H2S donor can release nitricoxide and hydrogen sulfide step by step in response to the endogenous enzymes β-galactosidase and carbonic anhydrase, providing potent therapeutic efficacy for heart failure post- myocardial infarction.