Novel group transfer cyclization reactions of organotellurium compounds
作者:Lars Engman、Vijay Gupta
DOI:10.1039/c39950002515
日期:——
When irradiated in the presence of hexabutylditin, readily available O-allylated and O-prop-2-ynylated 2-hydroxyalkyl aryl tellurides undergo group transfer cyclization to afford 2, 4-disubstituted tetrahydrofuran derivatives.
Tetrahydrofuran Derivatives from Epoxides <i>via</i> Group Transfer Cyclization or Reductive Radical Cyclization of Organotellurium and Organoselenium Intermediates
作者:Lars Engman、Vijay Gupta
DOI:10.1021/jo961578n
日期:1997.1.1
undergo grouptransfer cyclization to afford 2-substituted 4-[(aryltelluro)methyl]tetrahydrofurans (cis/trans = 1/3-1/10). The aryl beta-(prop-2-ynyloxy)alkyl tellurides similarly afforded 2-substituted 4-[(aryltelluro)methylene]tetrahydrofurans with an E/Z-ratio close to unity. The beta-(allyloxy)alkyl aryl selenides and aryl beta-(prop-2-ynyloxy)alkyl selenides failed to undergo grouptransfer cyclization