J. J. P. Selvam et al. / Tetrahedron Letters 47 (2006) 2507–2509
2509
Table 1 (continued)
Entry
Substrate
Producta
Time (h) and temp. (ꢁC)
Yieldb (%)
OH
OH
CHO
NO2
CHO
11
2, 50
91
NO2
OH
OH
12
13
0.5, rt
88
95
NO2
NO2
OH
OH
NO2
OH
3, rt
NO2
OH
14
15
3, rt
97
84
OH
O
O
OH
O
O
5, 50
NO2
a All the products were characterized by 1H NMR and mass spectral data.
b Isolated yields after silica gel chromatography.
Commun. 2001, 31, 1123–1128; (e) Bahulayan, D.; Nara-
yan, G.; Sreekumar, V.; Lalithambika, M. Synth. Com-
mun. 2002, 32, 3565–3574; (f) Tanemura, K.; Suzuki, T.;
Nishida, Y.; Satsumabayashi, K.; Horaguchi, T. J. Chem.
Res. (S) 2003, 497–499; (g) Joshi, A. V.; Baidoosi, M.;
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(1 mmol) and the resulting mixture stirred at room tem-
perature. After completion of the reaction, as monitored
by TLC, the solvent was removed under reduced pres-
sure. Water was added and the product extracted into
ethyl acetate (3 · 5 ml). The combined organic layer
was concentrated in vacuum to give the crude product,
which was chromatographed over silica gel to give the
pure compound in high yield.
Acknowledgements
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The authors gratefully acknowledge CSIR—India, for
the JRF fellowship.
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