Synthesis of 2-Imino-1,3,4-thiadiazoles from Hydrazides and Isothiocyanates via Sequential Oxidation and P(NMe<sub>2</sub>)<sub>3</sub>-Mediated Annulation Reactions
作者:Zhengyan Huang、Qianqian Zhang、Qiongli Zhao、Wenquan Yu、Junbiao Chang
DOI:10.1021/acs.orglett.0c01393
日期:2020.6.5
N-acyldiazenes with isothiocyanates, producing 2-imino-1,3,4-thiadiazoles, is reported. This reaction proceeds well with crude N-acyldiazenes derived from the oxidation of hydrazides by iodine and permits the sequential synthesis of products directly from hydrazides without purification of the less stable N-acyldiazene intermediates. The reaction does not require transition metals and is a simple, scalable operation
报道了AP(NMe 2)3介导的N-酰基二氮烯与异硫氰酸酯的环化反应,产生2-亚氨基-1,3,4-噻二唑。该反应与衍生自酰肼被碘氧化的粗制N-酰基二氮烯进行得很好,并允许直接从酰肼连续合成产物,而无需纯化不稳定的N-酰基二氮烯中间体。该反应不需要过渡金属,是一种简单,可扩展的操作,具有广泛的底物范围。