?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=http%3A%2F%2Fd-scholarship-dev.library.pitt.edu%2F9715%2F&rft.title=STUDIES+ON+AZA-CYCLOADDITION%3APART+1.+INTRAMOLECULAR+KETENE-IMINE+CYCLOADDITIONPART+2.+IMINIUM+ION-MEDIATED+%5B4%2B2%5D+CYCLOADDITION&rft.creator=Park%2C+Jung-hyun&rft.description=Part+1.+Intramolecular+Ketene-Imine+CycloadditionThe+ketene-imine+cycloaddition+reactions%2C+developed+previously+by+the+Nelson+group%2C+have+beenextended+to+the+intramolecular+cycloaddition+of+the+ketene-imine+cycloaddition.+Initial+resultsshowed+that+the+intramolecular+cycloaddition+exhibited+excellent+enantioselectivity%2C+but+it+wassuffered+from+poor+diastereoselectivity.+Later%2C+it+was+shown+that+proper+functionality+on+thetether+of+the+substrate+could+improve+diastereoselectivity.Part+2.+Iminium+Ion-Mediated+%5B4%2B2%5D+CycloadditionThe+N-alkenyl+iminium+ion+cycloaddition+reaction+(AIC+reaction)%2C+developed+previously+by+theNelson+group%2C+was+further+investigated+for+the+more+detailed+understaniding.+As+a+result%2C+tworeaction+pathways+(Diels-Alder+pathway+and+oxo-Diels-Alder+pathway)+of+the+AIC+reaction+werefound+when+carbamate-protected+N-alkenyl+iminium+ion+was+employed+as+a+4%C6%92%C3%A0-electroncomponent.+Based+on+this+observation%2C+efficient+methods+to+turn+off+either+one+of+the+tworeaction+pathways+were+proposed.&rft.date=2011-01-31&rft.type=University+of+Pittsburgh+ETD&rft.type=PeerReviewed&rft.format=application%2Fpdf&rft.language=en&rft.identifier=http%3A%2F%2Fd-scholarship-dev.library.pitt.edu%2F9715%2F1%2FPark_27Aug2010_1.pdf&rft.identifier=++Park%2C+Jung-hyun++(2011)+STUDIES+ON+AZA-CYCLOADDITION%3APART+1.+INTRAMOLECULAR+KETENE-IMINE+CYCLOADDITIONPART+2.+IMINIUM+ION-MEDIATED+%5B4%2B2%5D+CYCLOADDITION.++Doctoral+Dissertation%2C+University+of+Pittsburgh.++++(Unpublished)++