Annulation Reactions of In-Situ-Generated <i>N</i>-(Het)aroyldiazenes with Isothiocyanates Leading to 2-Imino-1,3,4-oxadiazolines
作者:Qiongli Zhao、Linning Ren、Jiao Hou、Wenquan Yu、Junbiao Chang
DOI:10.1021/acs.orglett.8b03663
日期:2019.1.4
A novel annulation reaction of N-(het)aroyldiazenes and isothiocyanates has been established. This transformation involves a sequential cyclization and desulfurization/intramolecular rearrangement to produce 2-imino-1,3,4-oxadiazolines. The less-stable N-(het)aroyldiazenes can be conveniently generated in situ by I2-mediated oxidation of hydrazides, which allows a one-pot synthesis of the products
已经建立了N-(杂)芳酰基二氮烯和异硫氰酸酯的新型环化反应。该转化涉及顺序环化和脱硫/分子内重排以产生2-亚氨基-1,3,4-恶二唑啉。较不稳定的N-(杂)芳酰基二氮烯可以方便地通过I 2介导的酰肼氧化原位生成,这可以直接从易于获得的酰肼和异硫氰酸酯底物一锅法合成产物。这种操作简单的合成方法不需要使用恶臭的异氰酸酯,并且可以方便地以克为单位进行。