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Typical Experimental Procedure A mixture of an aldehyde (1.0 mmol) and an appropriate 2-amino alcohol (1.0 mmol) was stirred for 4 h at r.t, Diacetoxyiodo)benzene (1.2 mmol) was then added to the above mixture and the resulting reaction mixture was again subjected for stirring for another 3-6 h. The progress of the reaction was monitored by TLC. After the completion of the reaction, H2O (15 mL) was added and the mixture extracted with CH2Cl2 (2 x 15 mL, The combined organic extracts were dried over anhyd Na2SO4, concentrated in vacuo, and chromatographed to give 2-substituted oxazolines/oxazines. Spectroscopic Data of Selected Products 2-(4-Nitrophenyl)-4,5-dihydrooxazole Mp 157-159°C. IR (KBr, 3028, 2971, 2894, 1649, 1602, 1528, 1464, 1349, 1268, 1092, 952, 861, 710 cm-1. 1H NMR (CDCl3, δ, 4.12 (t, J, 9.6 Hz, 2 H, 4.50 (t, J, 9.6 Hz, 2 H, 8.14 d, J
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3): δ = 1.99 (quin, J = 5.8 Hz, 2 H), 3.66 (t, J = 5.6 Hz, 2 H), 4.37 (t, J = 5.6 Hz, 2 H), 8.07 (d, J = 9.2 Hz, 2 H), 8.22 (d, J = 9.3 Hz, 2 H). LCMS [M + 1]: m/z = 207.
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3 (10 mL) was independently carried out at r.t. stirring for another 3 h. After usual reaction workup, the formation of 4,5-dihydro-4,4-dimethyl-2- styryloxazole was realized in 38% yield.
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3 (10 mL) was independently carried out at r.t. stirring for another 3 h. After usual reaction workup, the formation of 4,5-dihydro-4,4-dimethyl-2- styryloxazole was realized in 38% yield.
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Katritzky, A. R.; Cai, C.; Suzuki, K.; Singh, S. K. J. Org. Chem. 2004, 69, 811.
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Katritzky, A.R.1
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Singh, S.K.4
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