1,3-Bicyclo[1.1.1]pentanediyl: The Shortest Rigid Linear Connector of Phenylated Photochromic Units and a 1,5-Dimethoxy-9,10-di(phenylethynyl)anthracene Fluorophore
作者:Armin de Meijere、Ligang Zhao、Vladimir N. Belov、Mariano Bossi、Matthias Noltemeyer、Stefan W. Hell
DOI:10.1002/chem.200601316
日期:2007.3.16
3-(4-iodophenyl)bicyclo[1.1.1]pentane, prepared in 63 % yield by iodination of 1,3-diphenylbicyclo[1.1.1]pentane, was selectively mono-coupled with 9-ethynyl-1,5-dimethoxy-10-phenylethynylanthracene (26), and subsequently with the zinc derivatives of 1-(2-methyl/methoxy-4-methyl-5-phenylthiophen-3-yl)-2-(2-methyl/methoxy-4-methylt hiophen-3-yl)perfluorocyclopentenes (38-H-41-H). Regioselective synthesis of the
Nickel- and Palladium-Catalyzed Cross-Coupling Reactions at the Bridgehead of Bicyclo[1.1.1]pentane Derivatives - A Convenient Access to Liquid Crystalline Compounds Containing Bicyclo[1.1.1]pentane Moieties
作者:Matthias Messner、Sergei I. Kozhushkov、Armin de Meijere
Pd(PPh3)4, or PdCl2(dppf) catalysis to give a number of 1,3-disubstituted bicyclo[1.1.1]pentyl derivatives 17, 20, and 23, several of which exhibit liquid crystalline properties, in moderate to very good yields. The coupling products 20ca, 23ab, 23ae, 23ff, and 23fg have been further transformed to yield bicyclo[1.1.1]pentyl derivatives 32, 24ab, 24ae, 27ff, and 27fg, respectively, bearing alkynyl, cyano
Symmetrically 3,3'-disubstituted 1,1'-bi(bicyclo[1.1.1]pentanes) were synthesized in a four-step procedure, using commercially available starting materials, in fair overall yields (51-60%). In this synthesis the final step is an unexpected bridgehead-to-bridgehead homocoupling of bicyclo[1.1.1]pent-1-ylmagnesium halide catalyzed by palladium(II). Only 1.1 mol percent of bis(acetonitrile)palladium(II) chloride and two equivalents of bromomethane were necessary to accomplish this reaction. The bromomethane is essential to convert Pd-0 into Pd-II. The X-ray structure of the [2]staffane 1c has been determined and shows a nonbonded C1-C3 distance of 1.907 Angstrom in the bicyclo[1.1.1]pentyl subunit.
Symmetric Bridgehead-to-Bridgehead Coupling of Bicyclo[1.1.1]pentanes and [<i>n</i>]Staffanes
作者:Ctibor Mazal、Alex J. Paraskos、Josef Michl
DOI:10.1021/jo971419j
日期:1998.4.1
Symmetrical bridgehead-to-bridgehead coupling of bicyclo[1.1.1]pentane cages has been effected in 48-70%, yields by the cuprate oxidation method.
PATRICK, T. B.;JOHRI, K. K.;WHITE, D. H.;BERTRAND, W. S.;MOKHTAR, R.;KILB+, CAN. J. CHEM., 1986, 64, N 1, 138-141
作者:PATRICK, T. B.、JOHRI, K. K.、WHITE, D. H.、BERTRAND, W. S.、MOKHTAR, R.、KILB+