I<sub>2</sub>-Catalyzed Oxidative N–S Bond Formation: Metal-Free Regiospecific Synthesis of N-Fused and 3,4-Disubstituted 5-Imino-1,2,4-thiadiazoles
作者:Nagaraju Tumula、Nagesh Jatangi、Radha Krishna Palakodety、Sridhar Balasubramanian、Mangarao Nakka
DOI:10.1021/acs.joc.7b00646
日期:2017.5.19
4-disubstituted 5-imino-1,2,4-thiadiazole derivatives has been achieved through the molecular iodine-catalyzed oxidative cyclization of 2-aminopyridine/amidine and isothiocyanate via N–S bond formation at ambient temperature. The present one-pot transition-metal-free protocol provides the facile and highly efficient regiospecific synthesis of various 1,2,4-thiadiazole derivatives in a scaled-up manner with good
通过分子碘催化2-氨基吡啶/ am和异硫氰酸酯的氧化环化反应,已经获得了一种新颖且快速的合成N-稠合的3,4-二取代的5-亚氨基-1,2,4-噻二唑衍生物的方法。在环境温度下形成N–S键。本发明的一锅无过渡金属方案使用廉价的I 2作为催化剂,以放大的方式提供了各种1,2,4-噻二唑衍生物的简便且高效的区域特异性合成,具有良好或优异的产率。