6228-44-0Relevant academic research and scientific papers
Silver(I)-Catalyzed Tandem Sigamatropic Rearrangement/1,3-H Shift/6π Aza-electrocyclization of N-Propargylic Hydrazones: A Mild Synthetic Route to 1,6-Dihydropyridazines
Ding, Zong-Cang,Ju, Lu-Chuan,Yang, Ying,An, Xiao-Ming,Zhou, Yun-Bing,Li, Ren-Hao,Tang, Hai-Tao,Ding, Cheng-Ke,Zhan, Zhuang-Ping
, p. 3936 - 3941 (2016/05/24)
A highly efficient AgOTf catalyzed [3,3] sigmatropic rearrangement/1,3-H shift/6' aza-electrocyclization cascade reaction of N-propargylic hydrazones has been developed. This method provides a new mild synthetic route to various polysubstituted 1,6-dihydr
Synthesis of polysubstituted pyrazoles by a platinum-catalyzed sigmatropic rearrangement/cyclization cascade
Wen, Jia-Jie,Tang, Hai-Tao,Xiong, Kai,Ding, Zong-Cang,Zhan, Zhuang-Ping
supporting information, p. 5940 - 5943 (2015/01/08)
A highly efficient Pt-catalyzed [3,3] sigmatropic rearrangement/cyclization cascade of N-propargylhydrazones is reported. The process provides expedient access to a variety of highly functionalized pyrazoles. The substrate has good substituted group compa
1,3-dipolar cycloaddition of hydrazones with α-oxo-ketenes: A three-component stereoselective entry to pyrazolidinones and an original class of spirooxindoles
Presset, Marc,Mohanan, Kishor,Hamann, Marie,Coquerel, Yoann,Rodriguez, Jean
supporting information; experimental part, p. 4124 - 4127 (2011/10/04)
Stereodefined monocyclic, spirobicyclic, and bis-spirotricyclic pyrazolidin-3-ones can be prepared efficiently by a three-component reaction involving a 1,3-dipolar cycloaddition of azomethine imines obtained from hydrazones with α-oxo-ketene dipolarophiles generated in situ. The reaction allows the creation of four covalent bonds and two contiguous chiral quaternary centers with excellent diastereoselectivity in a single catalyst/additive-free, highly atom-economical transformation. From a fundamental point of view, the reaction introduces α-oxo-ketenes as effective dipolarophiles in 1,3-dipolar cycloadditions.
Polystyrene sulfonic acid catalyzed greener synthesis of hydrazones in aqueous medium using microwaves
Polshettiwar, Vivek,Varma, Rajender S.
, p. 5649 - 5652 (2008/02/10)
An environmentally benign aqueous protocol for the synthesis of cyclic, bi-cyclic, and heterocyclic hydrazones using polystyrene sulfonic acid (PSSA) as a catalyst has been developed; the simple reaction proceeds efficiently in water in the absence of any
Ionic Liquid Promoted Rapid Synthesis of Aryl Hydrazones under Ambient Conditions
Siddiqui,Nadaf,Rajagopal,Daniel, Thomas,Lahoti,Srinivasan
, p. 41 - 48 (2007/10/03)
Aryl hydrazones have been synthesized in excellent isolated yields (90-96%) in short reaction time (4 min) under ambient conditions in the absence of any added catalyst by the reaction of aryl hydrazines with carbonyl compounds in the ionic liquid 1,3-di-
