D. D. Dhavale et al. / Tetrahedron 60 (2004) 3009–3016
3015
3640–3180 cm21; dH (300 MHz, D2O) 1.42–1.80 (6H, m,
H7, H8, H9), 2.79–2.91 (1H, m, H6a), 3.15–3.38 (4H, m,
H4, H6b, H9a), 3.65 (1H, bs, WH 6 Hz, H3), 3.87 (2H, bs,
WH 6 Hz, H2, H1); dC (75 MHz, D2O) 21.7, 22.9, 25.7, 55.7,
61.6, 66.4, 67.2, 70.2 (strong).
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Acknowledgements
We are thankful to CSIR, New Delhi for financial support
and UGC, New Delhi for the funds to procure 300 MHz
NMR Instrument.
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1
15. The H and 13C NMR spectra of compounds 7a, 8a, and 7b,
8b, in which a N-Cbz group is present, showed doubling of