Reaction of alkynes with cyclopropylcarbene-chromium complexes: a versatile [4+2+1-2] cycloaddition reaction for the construction of cyclopentenones
作者:Seniz U. Tumer、James W. Herndon、Leonard McMullen
DOI:10.1021/ja00048a008
日期:1992.10
limitations of the reaction between cyclopropylcarbene-chromium complexes and alkynes have been examined. A variety of cyclopropylcarbene complexes and alkynes have been employed in these studies. The reaction appears to be general for most simple alkynes, producing cyclopentenones. A mechanism has been proposed involving metallacyclobutene formation, electrocyclic ringopening, electrocyclic ring closure, CO
Reaction of cyclopropylcarbene–metal complexes with nucleophiles, halogens and HX
作者:Margaret D. Reid、Liz Tirado、Jianwei Zhang、Nwamara Dike、James W. Herndon
DOI:10.1016/j.jorganchem.2005.07.044
日期:2005.12
The reaction of halogens, pseudohalogens, and HX with cyclopropyl(phenylthio)carbene-chromium complexes leads to the formation of 1,4-dihalo-1-thiophenyl-1-butene systems with a moderate-high degree of stereocontrol in the formation of the alkene. A mechanism involving electrophilic activation of the carbene complex followed by nucleophilic attack at the cyclopropane carbon has been proposed.
Yakushkina,N.I.; Bolesov,I.G., Journal of Organic Chemistry USSR (English Translation), 1979, vol. 15, # 5, p. 853 - 859
作者:Yakushkina,N.I.、Bolesov,I.G.
DOI:——
日期:——
Carbanion-accelerated vinylcyclopropane rearrangement. Application in a general, stereocontrolled annulation approach to cyclopentene derivatives
作者:Rick L. Danheiser、Joanne J. Bronson、Kazuo Okano
DOI:10.1021/ja00301a051
日期:1985.7
Total Synthesis of (±)-Scopadulcic Acid B
作者:Larry E. Overman、Daniel J. Ricca、Vinh D. Tran
DOI:10.1021/ja972427k
日期:1997.12.17
The first total synthesis of a scopadulan diterpene is described. The key step is a double Heck cyclization of dienyl aryl iodide 8 to form tetracyclic enones 24 and 25 in 80-85% combined yield.