最先进的光邻近标记方法集中于短寿命反应中间体的目标生成和捕获,以提供局部蛋白质环境的快照。二氮丙啶是目前高分辨率邻近标记的黄金标准,可产生短寿命的芳基(三氟甲基)卡宾。在这里,我们提出了一种通过组织可穿透的深红色至近红外光(600-800 nm)从稳定的重氮源获取芳基(三氟甲基)卡宾的方法。这种活化的操作机制涉及从光激发锇(II)光催化剂到重氮的Dexter能量转移,从而揭示芳基(三氟甲基)卡宾。研究了重氮探针与氨基酸的标记偏好,显示出对杂原子-H 键的高反应性。在合成生物素化重氮探针后,对天然蛋白质以及与 Os 光催化剂结合的蛋白质进行标记研究。最后,我们证明,蛋白质抑制剂与光催化剂的缀合还可以在观察者蛋白质存在的情况下实现选择性蛋白质标记,并通过双抗体光催化系统实现哺乳动物细胞表面膜蛋白的特异性标记。
Pd-Carbene Migratory Insertion: Application to the Synthesis of Trifluoromethylated Alkenes and Dienes
作者:Xi Wang、Yan Xu、Yifan Deng、Yujing Zhou、Jiajie Feng、Guojing Ji、Yan Zhang、Jianbo Wang
DOI:10.1002/chem.201304143
日期:2014.1.20
Pd‐catalyzed cross‐coupling of halides with CF3‐substituted diazo compounds or N‐tosylhydrazones has been explored for the synthesis of CF3‐substituted alkenes and 1,3‐butadienes. Pd–carbene migratory insertion plays the key role in these transformations.
Cu(I)-Catalyzed Cross-Coupling of Terminal Alkynes with Trifluoromethyl Ketone <i>N</i>-Tosylhydrazones: Access to 1,1-Difluoro-1,3-enynes
作者:Zhikun Zhang、Qi Zhou、Weizhi Yu、Tianjiao Li、Guojiao Wu、Yan Zhang、Jianbo Wang
DOI:10.1021/acs.orglett.5b00980
日期:2015.5.15
elimination have been achieved in a Cu(I)-catalyzed cross-coupling reaction of terminal alkynes and trifluoromethyl ketone N-tosylhydrazones. The reaction represents an efficient synthesis of 1,1-difluoro-1,3-enyne derivatives. Mechanistically, the migratory insertion of the copper carbene intermediate leads to the C–C bond formation, which is followed by C–F bond cleavage.
Cu(I)-Catalyzed Three-Component Coupling of Trifluoromethyl Ketone<i>N</i>-Tosylhydrazones, Alkynes and Azides: Synthesis of Difluoromethylene Substituted 1,2,3-Triazoles
作者:Zhikun Zhang、Qi Zhou、Weizhi Yu、Tianjiao Li、Yan Zhang、Jianbo Wang
DOI:10.1002/cjoc.201600888
日期:2017.4
A CuI‐catalyzedthree‐component coupling of trifluoromethyl ketone N‐tosylhydrazones, alkynes and azides has been developed. The reactionrepresents a straightforward method to access difluoromethylene substituted 1,2,3‐triazoles. Mechanistically, it has been proposed that the reaction follows a pathway involving the formation of Cu(I)triazolide intermediate, Cu(I) carbene formation, migratory insertion
Enantioselective rhodium-catalysed insertion of trifluorodiazoethanes into tin hydrides
作者:Stephen Hyde、Janis Veliks、David M.H. Ascough、Robert Szpera、Robert S. Paton、Véronique Gouverneur
DOI:10.1016/j.tet.2018.11.022
日期:2019.1
insertion reactions with tinhydrides affording the corresponding α-(trifluoromethyl)benzyl stannanes. This reactivity contrasts with that of diazo esters which predominantly afford CH2 reduction products in the presence of tinhydrides. The first example of asymmetric insertion into tinhydrides using diazo compounds is also described. In addition, this system extends to asymmetric germanium hydride and