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。
Solid-Phase Parallel Synthesis of 5-Amino- and 5-Amido-1,2,4-thiadiazole Derivatives via Cyclization Reactions of a Carboxamidine Thiourea Linker
作者:Young-Dae Gong、In Ryu、Joo Park、Hyea Han
DOI:10.1055/s-0028-1087961
日期:2009.4
parallel synthesis of 5-amino- and 5-amido-1,2,4-thiadiazoles. The sequence developed for this purpose is based on cyclizationreactions of resin-bound carboxamidine thioureas promoted by p-toluene-sulfonyl chloride. The resin-bound carboxamidine thioureas, produced by addition of arylcarboxamidines to a isothiocyanate terminated resin, serve as key intermediates that undergo cyclizations to generate