An efficient Cs2CO3‐promoted synthesis of α‐amino ketones using hydrazines, aldehydes, and α‐haloketones as starting materials through a cascade condensation/nucleophilic substitution/NNbondcleavage route is developed. The carbonyl group plays a key role in this novel NNbondcleavage process.
通过级联缩合/亲核取代/ NN键裂解途径,以肼,醛和α-卤代酮为起始原料,开发了一种高效的Cs 2 CO 3促进的α-氨基酮合成方法。羰基在这种新颖的NN键裂解过程中起关键作用。
Acid-Promoted [3 + 1 + 1] Cyclization of <i>N</i>-Tosylhydrazones and Isocyanides: A Method for the Preparation of 4,5-Diaminopyrazoles
作者:Qian Zhang、Meng Tang、Siyu Zhang、Zeyang Wei
DOI:10.1021/acs.orglett.0c01809
日期:2020.7.2
facile method for the preparation of 4,5-diaminopyrazoles from N-tosylhydrazones and isocyanides was developed. The reaction was general for a wide range of substrates, and it demonstrated excellent tolerance to a variety of substituents. More importantly, the protective groups of aminos could be selectively removed by controlling the amount of acid. A novel acid-promoted [3 + 1 + 1] cyclization mechanism
Copper(I)-Catalyzed Stereoselective Synthesis of (1<i>E</i>,3<i>E</i>)-2- Sulfonyl-1,3-dienes from<i>N</i>-Propargylic Sulfonohydrazones
作者:Yu Zhu、Hai-Tao Tang、Zhuang-Ping Zhan
DOI:10.1002/adsc.201300126
日期:2013.5.3
A new method for the stereoselectivesynthesis of highly substituted (1E,3E)‐2‐sulfonyl‐1,3‐dienes from N‐propargylic sulfonohydrazone derivatives has been developed via copper(I)‐catalyzed [3,3] rearrangement and highly regioselective migration of the sulfonyl group.