Copper-catalyzed synthesis of 3-substituted-5-amino-1,2,4-thiadiazoles via intramolecular N–S bond formation
摘要:
A copper-catalyzed N-S bond formation was utilized to produce 3-substituted-5-amino-1,2,4-thiadiazoles from imidoyl thioureas obtained by reaction of amidine hydrochlorides with isothiocyanates. Moreover, the 1,2,4-thiadiazoles were generated through a one-pot protocol without the isolation of the intermediates. This new method is highly efficient and convenient because it employs the cheap and environmentally friendly copper salt and can be conducted under air. (C) 2014 Elsevier Ltd. All rights reserved.
A copper-catalyzed aerobic oxidative annulation reaction of 2-aminopyridine/amidine with isothiocyanate has been reported. This strategy involving C–N/N–S bond formations provides various 5-amino/imino-substituted 1,2,4-thiadiazole derivatives under a Cu/O2 catalytic system. This method has demonstrated high reactivity, mild reaction conditions, and a broad substrate scope. Furthermore, the synthetic
已经报道了2-氨基吡啶/ am与异硫氰酸盐的铜催化的需氧氧化环化反应。这种涉及C–N / N–S键形成的策略可在Cu / O 2催化体系下提供各种5-氨基/亚氨基取代的1,2,4-噻二唑衍生物。该方法显示出高反应活性,温和的反应条件和广泛的底物范围。此外,该方法的综合实用性通过进一步的修改得到了证明。
10.3184/030823408x317272
作者:Dueruest, Yasar、Yildirim, Muhammet、Aycan, Asli
DOI:10.3184/030823408x317272
日期:——
KOCEVAR, M.;POLANC, S.;SOLLNER, M.;VERCEK, B., J. SERB. CHEM. SOC., 53,(1988) N 2, C. 75-78