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
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
One‐pot synthesis of 2‐imino‐1,3,4‐thiadiazolines from acylhydrazides and isothiocyanates
作者:Su Been Kim、Sang Eun Baek、Jae Hyeok Lim、Jinho Kim
DOI:10.1002/bkcs.12585
日期:2022.8
A one-pot synthesis of 2-imino-1,3,4-thiadiazolines was successfully achieved under mild conditions. The developed synthesis involves Fe(Pc)-catalyzed aerobic oxidation of acylhydrazides followed by P(NMe2)3-mediated annulation of the in situ generated N-acyldiazene with isothiocyanates. The present annulation showed broad substrate scope with good functional group tolerance, and was effective on gram