Silylstannylation of Allenes and Silylstannylation−Cyclization of Allenynes. Synthesis of Highly Functionalized Allylstannanes and Carbocyclic and Heterocyclic Compounds
作者:Ramaiah Kumareswaran、Seunghoon Shin、Isabelle Gallou、T. V. RajanBabu
DOI:10.1021/jo049010z
日期:2004.10.1
silicon−tin reagents to undergo the cyclization illustrate the scope and limitations of the reaction. Based on the isolation of intermediates, a mechanism for the formation of the cyclic compounds is proposed. Model transition states to explain the stereoselectivity in cyclization of substituted allenynes are provided. Further elaboration using the vinyltin and vinylsilane moieties should lead to highly functionalized
Model Studies for Damage to Nucleic Acids Mediated by Thiyl Radicals
作者:Jonathan Griffiths、John A. Murphy
DOI:10.1016/s0040-4020(01)88306-x
日期:1992.1
The ability of phenylthiovinyl radicals to abstract hydrogen from appropriately substituted carbon atoms has been studied as a model for the reactions of the deoxyribose units of DNA with similar radicals in vivo.
Synthesis of Indolizidine and Quinolizidine Derivatives via Intramolecular Cyclization of Alkynyltungsten Compounds with <i>N</i>-Acyliminium Ion
作者:Heh-Lung Huang、Wen-Hsuan Sung、Rai-Shung Liu
DOI:10.1021/jo010406+
日期:2001.9.1
BOER-TERPSTRA T.; DIJKINK J.; SCHOEMAKER H. E.; SPECKAMP W. N., TETRAHEDRON LETT <TELE-AY>, 1977, NO 11, 939-942
作者:BOER-TERPSTRA T.、 DIJKINK J.、 SCHOEMAKER H. E.、 SPECKAMP W. N.
Cyclisation of acetylenic ethoxylactams 1b-12b leads to bridgehead nitrogen bicyclic ketones in excellent yields. The reaction is weakly acid-catalysed and proceeds at ambient temperature. The observed regioselectivity effect is discussed in terms of stability of exo vs endo vinylcations and ring strain effects. The high yield conversion of N-(5-hexynyl)-ethoxy lactams 7b and 8b in the 5/8 and 6/8