Dibromination of 5-pyrazolones and 5-hydroxypyrazoles via dibromoisocyanuric acid
作者:Kaung-Min Cheng、Jin Bin Wu、Hui-Chang Lin、Jiann-Jyh Huang、Yu-Ying Huang、Shao-Kai Lin、Tsung-Ping Lin、Fung Fuh Wong
DOI:10.1002/jhet.442
日期:——
A safe and efficient method was developed for the dibromination of pyrazolones and 5‐hydroxypyrazoles by use of dibromoisocyanuricacid (DBI). The reaction gave the corresponding dibrominated pyrazolones in excellent yields (≥91%). J. Heterocyclic Chem., (2010).
1,1′-Carbonyldiimidazole (CDI) Mediated Coupling and Cyclization To Generate [1,2,4]Triazolo[4,3-<i>a</i>]pyridines
作者:Kyle D. Baucom、Siân C. Jones、Scott W. Roberts
DOI:10.1021/acs.orglett.5b03589
日期:2016.2.5
An operationally efficient CDI mediated tandem coupling and cyclization reaction to generate [1,2,4]triazolo[4,3-a]pyridines has been reported. The reaction conditions and scope were investigated, and the methodology was demonstrated in batch mode as well as in a continuous process.
已经报道了可操作有效的CDI介导的串联偶联和环化反应以生成[1,2,4]三唑并[4,3- a ]吡啶。研究了反应条件和范围,并以分批方式以及连续过程证明了该方法。
Access to 3-Amino-[1,2,4]-triazolo Pyridines and Related Heterocycles via Electrochemically Induced Desulfurative Cyclization
作者:Yunfei Hu、Li Chen、Canlin Zou、Jiangtao He、Luanqi Feng、Jia-Qiang Wu、Wen-Hua Chen、Jinhui Hu
DOI:10.1021/acs.orglett.2c01968
日期:2022.7.22
An efficient, one-pot approach has been established for synthesizing a wide range of 3-amino-[1,2,4]-triazolo pyridines and related heterocycles from the electrochemically induced desulfurative cyclization of 2-hydrazinopyridines with isothiocyanates. The protocol allows for the formation of C–N bonds under simple conditions without transition metals or external oxidants. The practicability of this