<scp>Cu‐Catalyzed</scp>
Chemoselective Reduction of
<scp>
<i>N</i>
‐Heteroaromatics
</scp>
with
<scp>
NH
<sub>3</sub>
</scp>
·
<scp>
BH
<sub>3</sub>
</scp>
in Aqueous Solution
作者:Chao Gao、Qingqing Xuan、Qiuling Song
DOI:10.1002/cjoc.202100259
日期:2021.9
An efficient catalytic system was successfully developed on reduction of N-heteroaromatics with H3N∙BH3 as hydrogen source in CuSO4 solution, featuring excellent chemoselectivity as well as very broad functional group tolerance. Various challenging substrates, such as OH-, NH2-, Cl-, Br-, etc., contained quinolines, quinoxalines, 1,5-naphthyridines and quinazolines were all reduced smoothly. Mechanistic
在CuSO 4溶液中以H 3 N∙BH 3为氢源还原N-杂芳烃的高效催化体系成功开发,具有优异的化学选择性和非常广泛的官能团耐受性。各种具有挑战性的底物,如 OH-、NH 2 -、Cl-、Br-等,含有喹啉、喹喔啉、1,5-萘啶和喹唑啉均被顺利还原。机理研究表明,[Cu-H] 中间体可能是由 NH 3 ∙BH 3 产生的,据信NH 3 ∙BH 3与CuSO 4溶液中的H 3 N∙BH 3形成。