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33947725264
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2O and then recrystallized from EtOAc-hexane (1:3) to afford the pure product 4a as a white powder (58%).
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2O and then recrystallized from EtOAc-hexane (1:3) to afford the pure product 4a as a white powder (58%).
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24
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33947717422
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Typical procedure under microwave-assisted conditions: A mixture of β-naphthol (1 mmol, benzaldehyde (1 mmol) and urea (1.5 mmol) were finely mixed together. The reaction mixture was placed in a screw-capped vial and irradiated for 6 min with a power of 900 W. After cooling, the reaction mixture was washed with H2O and then recrystallized from EtOAc-hexane (1:3) to afford the pure product 4a (81, mp 218-220°C; IR (KBr, 3295, 1730, 1517 cm-1; 1H NMR (300 MHz, DMSO-d 6, δ, 6.19 (d, J, 2.1 Hz, 1 H, CH, 7.24-8.00 (m, 11 H, Ar-H, 8.87 (br s, 1 H, NH, 13C NMR (75 MHz, DMSO-d 6, δ, 54.20, 114.50, 117.32, 123.57, 125.54, 127.42, 127.81, 128.47, 129.08, 129.32, 129.41, 130.68, 130.86, 143.34, 147.85, 149.77; MS (ESI, m/z, 275 (7, M, 231 (100, 202 (35, 51 24
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+], 231 (100), 202 (35), 51 (24).
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24044514966
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Huang, S.1
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0037492348
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Cristau, P.1
Vors, J.2
Zhu, J.P.3
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1242328670
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Dondoni, A.1
Massi, A.2
Minghini, E.3
Bertolasi, V.4
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33947732948
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Selected characterization data: 1,2-Dihydro-1-(4-methylphenyl) naphtho[1,2-e][1,3]oxazine-3-one (4b, mp 166-16°C; IR (KBr, 3230, 3139, 1717 cm-1; 1H NMR (300 MHz, DMSO-d 6, δ, 2.21 (s, 3 H, CH3, 6.13 (d, J, 2.4 Hz, 1 H, CH, 7.10-7.99 (m, 10 H, Ar-H, 8.81 (s, 1 H, NH, 13C NMR (75 MHz, DMSO-d6, δ, 21.06, 53.98, 114.61, 117.29, 123.56, 125.49, 127.32, 127.76, 129.05, 129.33, 129.89, 130.59, 130.85, 137.78, 140.43, 147.80, 149.81; MS (ESI, m/z, 290 (10, M, H, 231 (100, 202 (20, 1,2-Dihydro-1-(4-chlorophenyl)naphtho[1,2- e][1,3]oxazine-3-one(4f, mp 208-210°C; IR (KBr, 3224, 3146, 1734 cm-1; 1H NMR (300 MHz, DMSO-d 6, δ, 6.24 (s, 1 H, CH, 7.31-8.01 (m, 10 H, Ar-H, 8.91 (s, 1 H, NH, 13C NMR 75 MHz, DMSO-d6, δ, 53.42, 114.02, 11
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3], 231 (100), 202 (15), 144 (100).
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