Journal
ORGANIC & BIOMOLECULAR CHEMISTRY
Volume 21, Issue 21, Pages 4393-4397Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d3ob00481c
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The beta-C-H functionalization of tertiary amines was achieved via the B(C6F5)(3)-catalyzed borrowing hydrogen strategy, leading to the synthesis of 1,3-diamines containing the indolin-3-one moiety in high yields. A possible catalytic cycle was proposed to explain the reaction process. Notably, the beta-C-H alkylation of amines is external oxidant- and transition-metal-free, making it economically favorable for chemical synthesis.
The beta-C-H functionalization of amines is one of the most powerful tools for the synthesis of saturated nitrogen-containing heterocycles in organic synthesis. However, the beta-C-H functionalization of amines via redox-neutral addition with cyclic-ketimines is still unprecedented. Herein, the beta-C-H functionalization of tertiary amines is described, providing the corresponding 1,3-diamines containing the indolin-3-one moiety in high yields via the B(C6F5)(3)-catalyzed borrowing hydrogen strategy. According to the experimental results, a possible catalytic cycle has been proposed to rationalize the process of this reaction. Notably, the beta-C-H alkylation of amines is external oxidant- and transition-metal-free, which makes a significant contribution to promoting economical chemical synthesis.
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