Formation of acetylenic compounds and ring transformations of 3-alkyl-3-ferrocenylcyclopropenes in the reaction with 1,3-diphenylisobenzofuran
摘要:
The reaction of 3-ferrocenyl-3-methylcyclopropene with 1,3-diphenylisobenzofuran leads to the formation of exo- and endo -1,4-epoxy-2-ethynyl-2-ferrocenyl-1,4-diphenyltetralines as the main products in addition to the isomeric Diels - Alder exo-adducts. At the same time, 3-tert-butyl- and 3-(1-adamantyl)-3-ferrocenylcyclopropenes form the endo- and exo-adducts of 3-alkyl-1,2-(1-propene-1,3-diyl)ferrocene. The structures of the acetylenic compounds and of the adduct containing a Bu-t-substituent are established by X-ray structural analysis. A possible reaction pathway via intermediate zwitter-ion is discussed. (C) 1998 Elsevier Science S.A. All rights reserved.
Stereoselective ZnCl<sub>2</sub>-Catalyzed B–H Bond Insertion of Vinyl Carbenes Generated from Cyclopropenes for the Synthesis of Allylboranes
作者:Ximei Zhao、Jian Jia、Zengzeng Li、Haotian Li、Yongqiang Wang、Guanghui Wang
DOI:10.1021/acs.joc.2c01568
日期:2022.10.7
insertion of vinyl carbenes generated from cyclopropenes into the B–H bonds of Lewis base–borane adducts for concise and efficient access to allylboranes has been developed. This protocol represents the first zinc-catalyzed B–H bond insertion of carbenes for organoborane compounds. In this protocol, inexpensive ZnCl2, with low toxicity, is used as the catalyst. This simple ligand-free catalytic system affords
An asymmetric hydrophosphination of 3,3-disubstituted cyclopropenes catalyzed by Cu(I)-(R,R)-QUINOXP* is developed, affording a series of phosphine derivatives in high to excellent diastereo- and enantioselectivities.
开发了 Cu(I)-( R , R )-QUINOXP*催化的 3,3-二取代环丙烯的不对称氢膦化反应,提供了一系列具有高至优异的非对映选择性和对映选择性的膦衍生物。
Photolysis of 3-ferrocenyl-3-methyl- and 3-fenocenyl-3-isopropylcyclopropenes was studied. Sensitized irradiation (triplet excitation) afforded [2+2]-cycloaddition products, vit., tricyclohexane derivatives. Direct irradiation (singlet excitation) of methyl-substituted ferrocenylcyclopropene gave rise to 2-ferrocenylbut-1-en-3-yne and trans-2-ferrocenylbut-2-ene. The isopropyl analog was converted into 1-ferrocenyl-4,4-dimethylcyclobutene. The reaction of this cyclopropene with 2-ferrocenyl-3-methylbut-1-ene afforded 1,3-diferrocenyl-3-isopropyl-6,6-dimethylcyclohexene. The latter compound and 3,6-diferrocenyl-3,6diisopropyltricyclo[3.1.0.0(2,4)]hexane were studied by X-ray diffraction analysis. Possible reaction pathways are discussed.