activation energies of various hydridetransferreactions was developed according to transition state theory using the Morse-type free energy curves of hydride donors to release a hydride anion and hydrideacceptors to capture a hydride anion and by which the activation energies of 187 typical hydride self-exchange reactions and more than thirty thousand hydride cross transferreactions in acetonitrile were
Thermodynamic Diagnosis of the Properties and Mechanism of Dihydropyridine-Type Compounds as Hydride Source in Acetonitrile with “Molecule ID Card”
作者:Xiao-Qing Zhu、Yue Tan、Chao-Tun Cao
DOI:10.1021/jp911137p
日期:2010.2.11
to release protons and hydrogens in acetonitrile, and the thermodynamic driving forces of the neutral pyridine-type radicals of the dihydropyridines to release electron in acetonitrile were determined by using titration calorimetry and electrochemical methods. The rates and activation parameters of hydride transfer from the dihydropyridines to acridinium perclorate, a well-known hydride acceptor, were
The reaction between N-alkyl-1,4-dihydropyridines and
dimethyldioxirane leads to dimeric tetrahydropyridines having oxygen atoms
at the 2- and 3-positions in good yields and with good stereocontrol;
these compounds are useful iminium ion precursors, and are satisfactorily
transformed into 2-substituted 3-hydroxy-1,2,3,4-tetrahydropyridines.
Oxidative Additions with 1,4-Dihydropyridines: A One-Pot Synthesis of 3,4,4a,5,8,8a-Hexahydro-2<i>H</i>-pyrido[3,2-b][1,4]oxazine Derivatives
作者:Rakesh Kumar、Shakshi Malik、Dhiraj Kumar、Ashok K. Prasad
DOI:10.1080/00397911.2010.515348
日期:2011.9.15
4a,5,8,8a-Hexahydro-2H-pyrido[3,2-b][1,4]oxazine derivatives (2a–h) are conveniently prepared in excellent yields by a one-pot synthesis from 1,4-dihydropyridines. The key transformation features an electrophilic interaction of iodine with N-alkyl-1,4-dihydropyridine (1a–d) in the presence of a nucleophile diethanol amine or N-methylethanol amine, stereoselectively leading to the corresponding bicyclic