Disclosed herein are mono- and di-substituted tetrazines and methods of their preparation and converting an oxetanyl ester to a thio-substituted tetrazine, which is then converted to a mono-substituted tetrazine, a di-substituted tetrazine, or a vinylether disubstituted tetrazine.
Rapid Ligand-Free Base-Accelerated Copper-Catalyzed Homocoupling Reaction of Arylboronic Acids
作者:Feng Gao、Xian-Li Zhou、Ya-Nan Cao、Xin-Chuan Tian、Xing-Xiu Chen、Yun-Xin Yao
DOI:10.1055/s-0036-1588361
日期:——
A rapid, ligand-free, base-accelerated, copper-catalyzed homocoupling reaction of (het)arylboronicacids is presented. A CuCl2·2H2O/Na2CO3-based catalyst enabled the formation of bi(het)aryl compounds by a homocoupling process in moderate to excellent yields (72–97%) within 15 minutes. A mechanism for the copper-catalyzed base-accelerated reaction is proposed.
Installation of Minimal Tetrazines through Silver-Mediated Liebeskind–Srogl Coupling with Arylboronic Acids
作者:William D. Lambert、Yinzhi Fang、Subham Mahapatra、Zhen Huang、Christopher W. am Ende、Joseph M. Fox
DOI:10.1021/jacs.9b08677
日期:2019.10.30
typically re-lies on linkers that can negatively impact the physiochemical properties of conjugates. Cross-coupling with arylboronic acids and a new reagent, 3-((p-biphenyl-4-ylmethyl)thio)-6-methyltetrazine (b-Tz), proceeds under mild, PdCl2(dppf)-catalyzed conditions to introduce minimal, linker-free te-trazine functionality. Safety considerations guided our design of b-Tz which can be prepared on decagram