The regiochemistry and stereochemistry of 1,3-dipolar cycloaddition of cyclic nitrones
作者:Sk. Asrof Ali、Javaid H. Khan、Mohammed I.M. Wazeer
DOI:10.1016/s0040-4020(01)81449-6
日期:1988.1
A comparative study of the regio- and stereo-chemical behaviour of the 1,3-dipolarcycloaddition of a series of alkenes with 1-pyrroline 1-oxide and 2,3,4,5-tetrahydropyridine 1-oxide has been carried out. The high degree of both regio- and stereochemical control observed in these reactions has been explained in terms of frontier orbital interaction, steric factors, and secondary orbital interaction
Nitrone cycloaddition : peracid oxidation of perhydro-1,2-oxazolo[3,2-c][1,4]oxazines
作者:Sk.Asrof Ali、Hasan A. Al-Muallem
DOI:10.1016/s0040-4020(01)87213-6
日期:1993.8
2-oxazolo[3,2-c][1,4]oxazines (2) and (6) in aprotic solvent is dictated by orientation of lone pair of electrons on nitrogen. In contrast to the case with the corresponding hexahydro-2H-isoxazolo[2,3-a]pyridines (17), the oxidation of (2) gives mainly an equilibrium mixture of aldonitrone (3) and its hydroxylamine tautomer (4) which undergo stereoselectivecycloaddition with styrene and methyl methacrylate