Synthesis of Cyanamides from Cyanogen Bromide under Mild
Conditions through N-Cyanation of Allylic Tertiary Amines
作者:Chenghui Sun、Honggang Liang、Lingxiang Bao、Yao Du、Yiying Zhang、Siping Pang
DOI:10.1055/s-0036-1588533
日期:2017.12
Cyanamides were selectively formed through a one-step nucleophilic substitution reaction of allylic tertiary amines with cyanogenbromide. Because of the mild reaction conditions and good yields of the reaction, as well as the commercial availability of the starting materials, this new method represents a valuable tool for the synthesis of cyanamides through an N-deallylation reaction and an N-cyanation
Cyanamides are an important class of molecules. This work describes a facile synthesis of disubstitutedcyanamides. Here, readily accessible 1-cyano-1, 2-benziodoxol-3-(1H)-one (CBX) was applied as a stable electrophilic cyanation reagent. Diverse secondaryamines were effectively cyanated. Moreover, secondary sulfonamides proved to be suitable substrates and were readily converted to N-alkyl(aryl
Electrochemical strategies for <i>N</i>-cyanation of secondary amines and α <i>C</i>-cyanation of tertiary amines under transition metal-free conditions
作者:Zhengjiang Fu、Yaping Fu、Jian Yin、Guangguo Hao、Xuezheng Yi、Tingting Zhong、Shengmei Guo、Hu Cai
DOI:10.1039/d1gc02529e
日期:——
Transition metal-free electrochemical approaches for the N-cyanation of secondaryamines and the α C-cyanation of tertiaryamines have been well established, with products being obtained in moderate to good yields and with good functional group tolerance under ambient conditions. The synthetic application of the protocols has been highlighted through scale-up experiments in a galvanostatic mode. Preliminary
Copper-promoted N-cyanation of aliphatic sec-amine by CuCN is achieved via oxidative coupling. This procedure employs O2 as a clean oxidant. Notably, sulfoximines and 1,1,3,3-tetramethylguanidine also worked well in this procedure. Thus, it represents a key progress in the C–N bond formation reaction as well as in the cyanation reaction.