Synthetic studies related to the esperamicin/calicheamicin aglycone: efficient construction of a homochiral oxabicyclo [7 : 3 : 1] analogue fromD-xylose
Cobalt-Mediated Synthesis of Angular [4]Phenylene: Structural Characterization of a Metallacyclopentadiene(Alkyne) Intermediate and Its Thermal and Photochemical Conversion
作者:Peter I. Dosa、Glenn D. Whitener、K. Peter C. Vollhardt、Andrew D. Bond、Simon J. Teat
DOI:10.1021/ol025956o
日期:2002.6.1
metallacyclopentadiene(alkyne) complex has been obtained. This type of metallacycle is believed to be the key intermediate in the cobalt-mediated [2 + 2 + 2]cycloaddition of alkynes. Thermal treatment leads to the generation of angular [4]phenylene, the X-ray structural details of which are described. Under photochemical conditions, the cobaltacycle isomerizes to a highly strained (cyclobutadieno)dibenzocyclooctatrienyne
Synthesis of bent [4]phenylene (cyclobuta[1,2-a:3,4-b′]bisbiphenylene) and structure of a bis(trimethylsilyl) derivative: the last [4]phenylene isomerElectronic supplementary information (ESI) available: selected bond distances and angles for 9, spectral and analytical information. See http://www.rsc.org/suppdata/cc/b1/b109789j/
作者:Dennis T.-Y. Bong、Lionel Gentric、Daniel Holmes、Adam J. Matzger、Frank Scherhag、K. Peter C. Vollhardt
DOI:10.1039/b109789j
日期:2002.1.30
The syntheses of the title compounds were accomplished by cobalt-catalyzedalkynecyclotrimerizations using two strategies; the properties of the bent phenylene frame reflect the combined effects of benzocyclobutadienofusion of the component [3]phenylene substructures.
The total synthesis of angular [4]- and [5]phenylene
作者:Rachel H. Schmidt-Radde、K. Peter C. Vollhardt
DOI:10.1021/ja00050a091
日期:1992.11
Syntheses of Syn and Anti Doublebent [5]Phenylene
作者:Dennis T.-Y. Bong、Eugene W. L. Chan、Rainer Diercks、Peter I. Dosa、Michael M. Haley、Adam J. Matzger、Ognjen Š. Miljanić、K. Peter C. Vollhardt、Andrew D. Bond、Simon J. Teat、Amnon Stanger
DOI:10.1021/ol049225v
日期:2004.6.1
[GRAPHICS]The parent and dipropyl-substituted anti (1a,b) and syn doublebent (2a,b) [5]phenylenes have been assembled by CpCo-catalyzed double cyclization of regiospecifically constructed appropriate hexaynes. H-1 NMR, NICS, and an X-ray structural analysis of is reflect the aromatizing effect of double angular fusion on the central ring of the linear [3]phenylene substructure.