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Volumn 59, Issue 42, 2003, Pages 8337-8345

Amide rotamers of N-acetyl-1,3-dimethyltetrahydroisoquinolines: Synthesis, variable temperature NMR spectroscopy and molecular modelling

Author keywords

Amides; Isoquinolines; Mercury and compounds; Molecular modelling; NMR; Rotamers

Indexed keywords

2 [2 [1 (ACETYLAMINO)ETHYL] 6 (BENZYLOXY) 3,5 DIMETHOXYPHENYL] 1 METHYLETHYL METHANESULFONATE; AMIDE; N ACETYL 5 BENZYLOXY 6,8 DIMETHOXY 1,3 DIMETHYL 1,2,3,4 TETRAHYDROISOQUINOLINE; N [1 (2 ALLYL 3 BENZYLOXY 4,6 DIMETHOXYPHENYL)ETHYL]ACETAMIDE; TETRAHYDROISOQUINOLINE DERIVATIVE; UNCLASSIFIED DRUG;

EID: 0141532303     PISSN: 00404020     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.tet.2003.09.001     Document Type: Article
Times cited : (36)

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    • -1, calculated for signal a in Figure 4, lies on the edge of this range and was not included in the calculation of the average free energy of activation
    • -1, calculated for signal a in Figure 4, lies on the edge of this range and was not included in the calculation of the average free energy of activation.
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    • This was not always easy as the Δδ values did not always tend to a constant over the temperature range used. The coalescence temperature was taken to be the temperature at which the separate signals merged to form a single signal. For a discussion on the limitations of the approach used in this study see:
    • This was not always easy as the Δδ values did not always tend to a constant over the temperature range used. The coalescence temperature was taken to be the temperature at which the separate signals merged to form a single signal. For a discussion on the limitations of the approach used in this study see: Allerhand A., Gutowsky H.S., Jonas J., Meinzer R.A. J. Am. Chem. Soc. 88:1966;3185-3194.
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    • This approach has been shown to afford reliable estimates within specified limits which include that Δδ be larger than 3 Hz for uncoupled systems, and that for coalescing singlets and doublets of different intensities (as in our case), good estimates are achieved as long as Δδ>4 Hz
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    • This included the removal of the benzyl protecting group to decrease the complexity of the system and thereby decrease the computational time required for each modelling calculation
    • This included the removal of the benzyl protecting group to decrease the complexity of the system and thereby decrease the computational time required for each modelling calculation.
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    • ®
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    • note
    • (b) MM+ force field, N.L. Allinger, 1991. (c) Torsional parameters for the bonds N2-C4-Ca-Ca, Ca-C4-N2-C4 and Ca-C4-N2-CO had to be provided (Ca=aromatic carbon, C4=aliphatic carbon, N2=amide nitrogen and CO=carbonyl carbon) and were left unconstrained (i.e. Fourier terms: V1, V2 and V3 were entered as 0.000).
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    • note
    • -1 (cis)].
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    • -1 was assigned to this rotation. For more information regarding this topic see the following report:
    • -1 was assigned to this rotation. For more information regarding this topic see the following report: Wiberg K.B. Acc. Chem. Res. 32:1999;922-929.
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    • 1H NMR spectroscopy and molecular modelling work. We are therefore convinced that the doubling evident in the NMR spectra of tetrahydroisoquinoline 8 and 16, is due to the presence of amide rotamers in solution rather than the presence of separate conformers.
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