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DMPU, N,N'-dimethyl-N,N'-propylideneurea. We routinely add DMPU to reactions where we wish to promote organolithium nucleophilicity, particularly toward aromatic rings. See ref 13 and
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DMPU ) N,N'-dimethyl-N,N'-propylideneurea. We routinely add DMPU to reactions where we wish to promote organolithium nucleophilicity, particularly toward aromatic rings. See ref 13 and:
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Only recently has 11 been made in enantiomerically enriched form by methods other than resolution. See ref 4 and: (a) Hatano, M, Miyamoto, T, Ishihara, K. Org. Lett. 2007, 9, 4535
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Only recently has 11 been made in enantiomerically enriched form by methods other than resolution. See ref 4 and: (a) Hatano, M.; Miyamoto, T.; Ishihara, K. Org. Lett. 2007, 9, 4535.
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We have reported related rearrangements of lithiated ureas that proceed with retentive stereospecificity via a configurationally stable nitrogensubstituted organolithium. See: (a) Clayden, J, Dufour, J, Grainger, D. M, Helliwell, M. J. Am. Chem. Soc. 2007, 129, 7488
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We have reported related rearrangements of lithiated ureas that proceed with retentive stereospecificity via a configurationally stable nitrogensubstituted organolithium. See: (a) Clayden, J.; Dufour, J.; Grainger, D. M.; Helliwell, M. J. Am. Chem. Soc. 2007, 129, 7488.
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See the Supporting Information for evidence of the stereochemical assignment of, S-11 and hence the invertive nature of the rearrangement. Electrophilic quenching of lithiated benzylic carbamates may proceed with either retention or inversion; see ref 6 and: Gawley, R. E. Tetrahedron Lett. 1999, 40, 4297
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See the Supporting Information for evidence of the stereochemical assignment of (+)-(S)-11 and hence the invertive nature of the rearrangement. Electrophilic quenching of lithiated benzylic carbamates may proceed with either retention or inversion; see ref 6 and: Gawley, R. E. Tetrahedron Lett. 1999, 40, 4297.
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DFT calculations were carried out at the B3LYP/6-31++G** level, with thermodynamic corrections (including zero-point effects) at the B3LYP/ 6-31G level see the Supporting Information for details.
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DFT calculations were carried out at the B3LYP/6-31++G** level, with thermodynamic corrections (including zero-point effects) at the B3LYP/ 6-31G level (see the Supporting Information for details.
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