ACETYLCARBAZOLE AND CORRESPONDING BIS-b-DIKETONES
605
Synthesis of 1,10-(2,6-Bis-pyridyl)-bis-3-(9-ethylcarbazole-
3-yl)-1,3-propanedione (2b)
The reaction procedure was the same as that of 2a except for the half amount
of dimethyl 2,6-pyridinedicarboxylate (0.38 g, 1.9 mmol). After filtration and acidiza-
tion, the dried crude products were purified by recrystallization from methanol and
chloroform (2:1), and the brownish yellow of compound 2b was obtained (0.85 g,
74%). Mp 113–115ꢀC; IR (cmꢁ1): 3432, 3051, 2975, 1708, 1593, 1492, 1472, 1448,
1383, 1346, 1233, 796, 749, 545; 1H NMR (400 MHz, CDCl3): d 16.95 (s, 1H,
OH), 16.82 (s, 1H, OH), 7.93–8.95 (m, 3H, PyH), 7.25–7.52 (m, 16H, PhH, CH),
4.36–4.39 (q, 4H, J ¼ 7.2 Hz, CH2), 1.27–1.47 (t, 6H, J ¼ 7.2 Hz, CH3). Anal. calcd.
for C39H31N3O4: C, 77.34; H, 5.16; N, 6.94. Found: C, 77.50; H, 5.02; N, 6.87.
ACKNOWLEDGMENTS
We gratefully acknowledge financial support of this work by the China
Postdoctoral Science Foundation (No. 20080431027) and the Postdoctoral Science
Foundation of Central South University.
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