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33
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12344289996
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note
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3 (30 mL × 3). The organic layer was dried over anhydrous sodium sulfate and evaporated to give an oily residue, which was purified by silica gel column chromatography (n-hexane to AcOEt/n-hexane = 1/8) to give pure 4a (43 mg, 73%) as a pale yellow solid. Analytical sample was obtained by recrystallization from isopropyl ether (mp 239-240°C)
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34
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12344305900
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note
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2: C, 85.24; H, 7.66; N, 7.10. Found: C, 84.94; H, 7.88; N, 6.92
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35
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0001649881
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For review see: U. Pindur Heterocycles 27 1988 1253 1268
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(1988)
Heterocycles
, vol.27
, pp. 1253-1268
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Pindur, U.1
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44
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12344278285
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note
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1/n. Crystallographic data (excluding structure factors) for the structure in this paper have been deposited with the Cambridge Crystallographic Data Centre as supplementary number CCDC 257507. Copies of the data can be obtained, free of charge, on application to CCDC, 12 Union Road, Cambridge CB2 1EZ, UK [fax: +44(0) 1223 336033 or e-mail: deposit@ccdc.cam.ac.uk ]
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