G. S. C. Srikanth et al. / Tetrahedron Letters 43 (2002) 5471–5473
5473
Acknowledgements
8. Yang, Z.-C.; Zhou, W.-S. Tetrahedron 1995, 51, 1429.
9. Gracza, T.; Jager, V. Synthesis 1994, 1359.
1
10. Compound 6: [h]2D5 −152.1 (c 0.2, MeOH): H NMR (300
G.S.C.S. would like to thank IIT Bombay and U.M.K.
to DST for a fellowship. We wish to thank Professor P.
Mathur and the National Single Crystal X-Ray Diffrac-
tion Facility at IIT Bombay. Also Dr. Shilpa Korde
and Dr. Dinesh Rele are highly acknowledged for their
helpful discussions.
MHz, CDCl3): lH 7.34 (m, 5H), 6.01 (m, 3H), 5.52 (t,
J=5.4 Hz, 1H), 4.97 (m, 1H), 4.30 (part of an AB
system, J=19.8 Hz, 1H), 4.08 (part of an AB system,
J=19.8 Hz, 1H), 3.55 (dd, J=2.5, 5.12 Hz, 1H), 2.09 (s,
3H), 2.08 (s, 3H), 2.07 (s, 3H). 13C NMR (75 MHz): lC
170.3, 169.6, 136.5, 131.8, 128.6, 126.9, 122.2, 74.2, 73.5,
73.1, 66.1, 65.49, 20.96, 20.92, 20.86.
References
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12. Compound 1: [h]2D5 −135.0 (c 0.2, MeOH): H NMR (300
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