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f value of 7a than 4a; however, our attempts to isolate 7b in pure form were unsuccessful.
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1H NMR spectrum of 7a, the H-4 of furanose appeared at the usual value of δ 4.5, indicating the absence of the diamagnetic deshielding effect of a lactone carbonyl. Probably, the intramolecular hydrogen bonding with -OH at C-5 holds the coumarin ring as shown in conformational structure 7a.
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(c) Conformation A has less steric impedance of the substituents than B. In addition, the nucleophilic attack in A seeks the LUMO of the carbonyl, which is stabilized through the mixing of the π* C=O orbital with the lowest energy σ* orbital associated with the electronegative oxygen of the furanose; see: Houk, K. N.; Paddon-Row: M. N.; Rondan, N. G.; Wu, Y.-D.; Brown, F. K.; Spellmeyer, D. C.; Metz, J. T.; Li, Y.; Loncharich, R. J. Science 1986, 231, 1108-1117. We are thankful to one of the reviewers for his comments.
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0344869972
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note
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Debenzylation in glucofuranose derivatives require high pressure under which C=C was found to be reduced. Starting compound was recovered even after 48 h at 4 bar.
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0344869971
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1,2 ≈ 8.2 Hz).
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75
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Lemieux, R. U.; Howard, J. Can. J. Chem. 1963, 41, 308-316. The characterization of structures 8-11 supported our earlier assignment for the carbinol 7a with the D-gluco configuration at C-5.
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Lemieux, R.U.1
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0344006872
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note
-
1H NMR data for all these compounds and in particular for 9β thus confirms the D-gluco configuration of 7a. The H-5 appeared as a doublet with a coupling constant of ∼9.7 Hz, indicating the axial-axial relation with H-4.
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78
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0344006871
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note
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13C NMR spectra showed <5% signals corresponding to enol tautomer.
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