Optically active dihydropyrans and 3-methylenetetrahydrofurans from cyclopropenylethanol derivatives
作者:Juma'a R.Al-Dulayymi、Mark S. Baird
DOI:10.1016/s0040-4020(01)87769-3
日期:1990.1
Reaction of a number of 2-(cycloprop-1-en-1-yl)ethanol derivatives with bromine, acid or silver ion leads to ring expansion, either to 5,6-dihydro 2H-pyrans or to 3-methylenetetrahydrofurans.
Baird, Mark S.; Hussain, Helmi H.; Nethercott, William, Journal of the Chemical Society. Perkin transactions I, 1986, p. 1845 - 1854
作者:Baird, Mark S.、Hussain, Helmi H.、Nethercott, William
DOI:——
日期:——
Neighbouring-group Influence on the Ring Opening of Some 2-Alkyl-1,1,2-tribromocyclopropanes under Phase-transfer Conditions
作者:Leiv K. Sydnes、Karl F. S. Alnes、Natalia Erdogan
DOI:10.1007/s00706-005-0358-z
日期:2005.10
Several 2-alkyl-1,1,2-tribromocyclopropanes were treated with sodium hydroxide and ethanol under phase-transfer conditions. Ring opening gave mixtures of the corresponding acetylenic diethyl ketals and acetals. When the steric bulk of the alkyl substituent was increased acetal formation dominated, and in the case of 1,1,2-tribromo-2-(tert-butyl)cyclopropane, the acetal was formed as the only product.
Synthesis and Trapping of Some Substituted 1-Bromocyclopropenes
作者:Karl F. S. Alnes、Leiv K. Sydnes
DOI:10.1007/s00706-006-0441-0
日期:2006.4
Treatment of a number of 2-substituted 1,1,2-tribromocyclopropanes with MeLi at -78 degrees C gave the corresponding 1-bromocyclopropenes, which were reacted with three cyclic dienes to yield the [4 + 2]-cycloadducts. Cycloaddition with 1,3-diphenylisobenzofuran (DPIBF) gave the exo adducts, in most cases in excellent yield, whereas cyclopentadiene afforded endo adducts only, but in moderate yield. In most reactions with furan no adduct was formed, but two 1-bromocyclopropenes derivatives with an aromatic side chain were exceptions and furnished mixtures of exo and endo adducts in moderate yields.
BAIRD, M. S.;NETHERCOTT, W., TETRAHEDRON LETT., 1983, 24, N 6, 605-608