Divergent Synthesis of Monosubstituted and Unsymmetrical 3,6‐Disubstituted Tetrazines from Carboxylic Ester Precursors
作者:Yixin Xie、Yinzhi Fang、Zhen Huang、Amanda M. Tallon、Christopher W. am Ende、Joseph M. Fox
DOI:10.1002/anie.202005569
日期:2020.9.21
unsymmetrical and 3‐monosubstituted tetrazines. Described here is a general, one‐pot method for converting (3‐methyloxetan‐3‐yl)methyl carboxylic esters into 3‐thiomethyltetrazines. These versatile intermediates were applied to the synthesis of unsymmetrical tetrazines through Pd‐catalyzed cross‐coupling and in the first catalytic thioether reduction to access monosubstituted tetrazines. This method enables
由于四嗪是生物正交化学领域的重要工具,因此需要新方法来合成不对称和 3-单取代四嗪。这里描述的是将 (3-methyloxetan-3-yl) 甲基羧酸酯转化为 3-硫甲基四嗪的通用单锅法。这些多功能中间体通过 Pd 催化的交叉偶联应用于不对称四嗪的合成,并在第一次催化硫醚还原中获得单取代四嗪。该方法能够开发具有动力学、小尺寸和亲水性的有利组合的新四嗪化合物。它被应用于广泛的脂肪族和芳香族酯前体以及杂环的合成,包括 BODIPY 荧光团和生物素。此外,