Synthesis and Characterization of Mono- and Bis-methano[60]fullerenyl Amino Acid Derivatives and Their Reductive Ring-Opening Retro-Bingel Reactions
作者:Glenn A. Burley、Paul A. Keller、Stephen G. Pyne、Graham E. Ball
DOI:10.1021/jo025928j
日期:2002.11.1
lycinate esters (Ph2C=NCH2CO2R) 3-6 to [60]fullerene under Bingel conditions gives, respectively, the methano[60]fullerenyl iminoesters 7-10. Upon treatment of 7-9 with sodium cyanoborohydride, in the presence of a protic or a Lewis acid, a novel reductive ring-opening reaction occurred to give the corresponding 1,2-dihydro[60]fullerenyl glycine derivatives 11-13. Using tethered bis-N-(diphenylmethylene)glycinate
Structural Reassignment of the Mono- and Bis-Addition Products from the Addition Reactions of <i>N</i>-(Diphenylmethylene)glycinate Esters to [60]Fullerene under Bingel Conditions
作者:Graham E. Ball、Glenn A. Burley、Leila Chaker、Bill C. Hawkins、James R. Williams、Paul A. Keller、Stephen G. Pyne
DOI:10.1021/jo051282u
日期:2005.10.1
esters (Ph2CNCH2CO2R) to [60]fullerene under Bingel conditions gives [60]fullerenyldihydropyrroles and not methano[60]fullerenyl iminoesters [C60C(CO2R)(NCPh2)] as previously reported. Unequivocal evidence for the structure of C60C(CO2Et)(NCPh2) was provided by INADEQUATE NMR studies on 13C enriched material. New mechanistic details are proposed to account for the formation of [60]fullerenyldihydropyrroles
Tandem reductive ring opening-retro-Bingel reactions of bismethano[60]fullerenes to give 1,2-dihydro[60]fullerylglycines
作者:Glenn A. Burley、Paul A. Keller、Stephen G. Pyne、Graham E. Ball
DOI:10.1039/b100655j
日期:——
Bismethano[60]fullerene derivatives 1 and 3 give
1,2-dihydro[60]fullerylglycines 2 and 4 respectively by a novel tandem
reductive ring opening-retro-Bingel reaction.
Reductive ring opening reactions of diphenyldihydrofullerenylpyrroles
作者:Bill C. Hawkins、Paul A. Keller、Stephen G. Pyne
DOI:10.1016/j.tetlet.2007.08.044
日期:2007.10
The reductiveringopening reaction conditions for the simple [60]fullerenyldihydropyrrole 1 have been optimized to include acetic acid in the reaction mixture to rapidly protonate the anionic intermediate. Under these conditions, the ring opened dihydrofullerene 2 was obtained in 68% yield. Under slightly modified conditions and at −78 °C, the reductive bis-ring opening of the tethered trans-4 isomer