Inside and outside N-bridged cavity systems: evidence for syn- and anti-atropisomers in scaffolds containing two N-benzoyl 7-azanorbornane units
摘要:
Alkene and aziridine reagents containing N-benzoyl 7-azanorbornane components have been prepared and used to construct [n]polynorbornanes in a block building protocol. The presence of syn- and anti-atropisomers involving the restricted rotation of the N-COPh bridge was established by H-1 NMR spectroscopy in an NNN-[3]polynorbornane 4 (outside bridges) whereas the anti-conformer dominated in a cavity NCOCOCN-[7]isopolynorbornane 8 (inside bridges, X-ray confirmation) prepared by a dual 1,3-dipolar addition of an acute-angled norbornene 6 with a hexacyclic bis-epoxide 7. (C) 2001 Published by Elsevier Science Ltd.
Inside and outside N-bridged cavity systems: evidence for syn- and anti-atropisomers in scaffolds containing two N-benzoyl 7-azanorbornane units
摘要:
Alkene and aziridine reagents containing N-benzoyl 7-azanorbornane components have been prepared and used to construct [n]polynorbornanes in a block building protocol. The presence of syn- and anti-atropisomers involving the restricted rotation of the N-COPh bridge was established by H-1 NMR spectroscopy in an NNN-[3]polynorbornane 4 (outside bridges) whereas the anti-conformer dominated in a cavity NCOCOCN-[7]isopolynorbornane 8 (inside bridges, X-ray confirmation) prepared by a dual 1,3-dipolar addition of an acute-angled norbornene 6 with a hexacyclic bis-epoxide 7. (C) 2001 Published by Elsevier Science Ltd.
Inside and outside N-bridged cavity systems: evidence for syn- and anti-atropisomers in scaffolds containing two N-benzoyl 7-azanorbornane units
作者:Ronald N Warrener、Guangxing Sun
DOI:10.1016/s0040-4039(00)01939-0
日期:2001.1
Alkene and aziridine reagents containing N-benzoyl 7-azanorbornane components have been prepared and used to construct [n]polynorbornanes in a block building protocol. The presence of syn- and anti-atropisomers involving the restricted rotation of the N-COPh bridge was established by H-1 NMR spectroscopy in an NNN-[3]polynorbornane 4 (outside bridges) whereas the anti-conformer dominated in a cavity NCOCOCN-[7]isopolynorbornane 8 (inside bridges, X-ray confirmation) prepared by a dual 1,3-dipolar addition of an acute-angled norbornene 6 with a hexacyclic bis-epoxide 7. (C) 2001 Published by Elsevier Science Ltd.