The “classical” challenge, raised by Emil Fischer as to why one monosaccharide arylhydrazone adopts a cyclic structure but another an acyclic structure, is answered here. The present comprehensive analysis of hexose and hexosamine arylhydrazones, based on 2D NMR spectroscopy and theoretical modeling, has established that the chain of hydrogen bonds needed for conformational selection can only be completed
A novel one-pot two-component synthesis of tricyclic pyrano[2,3-b]quinoxalines
作者:Shyamaprosad Goswami、Avijit Kumar Adak
DOI:10.1016/j.tetlet.2004.11.084
日期:2005.1
A one-pot two-component synthesis of tricyclic pyrano[2,3-b]quinoxalines with a pendant hydroxymethyl fuction at the 2-position relevant to molybtopterin is described by the reaction of o-phenylenediamine and phenylhydrazone derivatives of sugars in good yields.
通过与邻苯二胺和糖的苯hydr衍生物反应以高收率描述了一种单锅两组分合成三环吡喃并[2,3- b ]喹喔啉的方法,该方法在与蝶呤相关的2-位带有侧基羟甲基官能团。
A Novel Method for Synthesizing Aldonophenylhydrazono-lactones
A novel method for synthesizing aldonophenylhydrazono-lactones is described, utilizing cuprammonia ion (Cu(NH3)(4)(2+)) as catalyst, ammonium hydroxide as base and 95% alcohol as solvent. Compared with previous method[(6)], it shortens the reaction time, increases the yield and widens the reaction range.
Zemplen; Mester, Acta Chimica Academiae Scientiarum Hungaricae, 1952, vol. 2, p. 9,11,12
作者:Zemplen、Mester
DOI:——
日期:——
A KINETIC STUDY OF THE FORMATION OF d-GLUCOSE PHENYLHYDRAZONE<sup>*</sup>