Highly stereoselective tandem cyclizations of 5-hexenyllithiums: preparation of endo-2-substituted bicyclo[2.2.1]heptanes and 3-substituted trans-bicyclo[3.3.0]octanes
作者:William F. Bailey、Atmaram D. Khanolkar、Kaustubh V. Gavaskar
DOI:10.1021/ja00047a013
日期:1992.10
diolefinic alkyl iodides by low-temperature lithium-iodine exchange, proceeds via two highly stereoselective and totally regiospecific 5-exo-trig ring closures to deliver bicyclic alkyllithiums. Trapping of the organolithium product by addition of an electrophile cleanly affords functionalized bicyclic molecules in good yield. In this way both endo-2-substituted bicyclo[2.2.1]heptanes and 3-substituted
Bailey, William F.; Khanolkar, Atmaram D.; Gavaskar, Kaustubh, Journal of the American Chemical Society, 1991, vol. 113, # 15, p. 5720 - 5727
作者:Bailey, William F.、Khanolkar, Atmaram D.、Gavaskar, Kaustubh、Ovaska, Timo V.、Rossi, Kyllikki、Thiel, Yvonne、Wiberg, Kenneth B.
DOI:——
日期:——
Stereoselectivity of ring closure of substituted hex-5-enyl radicals
作者:Athelstan L. J. Beckwith、Tony Lawrence、Algirdas K. Serelis
DOI:10.1039/c39800000484
日期:——
1,5-Ring closure of 1- or 3-substituted hex-5-enylradicals affords mainly cis-disubstituted cyclic products, whereas 2- or 4-substituted species give mainly trans-products; the significance of this stereoselectivity is demonstrated in the formation of the norbornane system from acyclic precursors.