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
Ti(IV) promoted 1, 3-dipolar cycloaddition of nitrones to vinyl ethers
作者:Pau Bayo´n、Pedro de March、Marta Figueredo、Josep Font
DOI:10.1016/s0040-4020(98)00983-1
日期:1998.12
The 1, 3-dipolar cycloaddition of nitrones to vinylethers is accelerated by Ti(IV) species. The efficiency of the catalyst parallels its complexation capacity. The use of Ti(iPrO)2Cl2 favours the formation of trans cycloadducts, presumably through an endo bidentate complex, in which the metal atom is simultaneously coordinated to the vinylether and to the cyclic nitrone or the Z isomer of the acyclic