Thiol-promoted intermolecular cyclization to synthesize 1,2,4-oxadiazoles including tioxazafen under transition metal-free conditions
作者:Congcong Yan、Min Zhang、Jiaxin Li、Jinli Zhang、Yangjie Wu
DOI:10.1039/d3ob00770g
日期:——
and efficient one-pot intermolecular annulation reaction for the synthesis of 1,2,4-oxadiazoles from amidoximes and benzyl thiols has been developed, in which benzyl thiols act as not only reactants but also organo-catalysts. The control experiments proved that thiol substrates could facilitate the dehydroaromatization step. High yield, functional group diversity and transition metal-free, extra oxidant-free
开发了一种简单高效的一锅式分子间环化反应,用于由偕胺肟和苄硫醇合成 1,2,4-恶二唑,其中苄硫醇不仅充当反应物,而且充当有机催化剂。对照实验证明硫醇底物可以促进脱氢芳构化步骤。产率高、官能团多样性、不含过渡金属、不含额外氧化剂、条件温和是其重要的实用特点。此外,该方案为合成市售广谱杀线虫剂 tioxazafen 提供了一种有效的替代方法。