A kind of method for preparing isoxazole compound
A technology for isoxazole compounds and copper compounds, which is applied in the field of preparing isoxazole compounds, can solve the problems of inconvenient large-scale industrial production, high solvent requirements, increased cost, etc., and achieves wide application range, simple post-processing, and reaction safe effect
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Embodiment 1
[0034]
[0035] The reaction flask was sequentially charged with CuI (0.15 mmol, 28 mg), Mg(OTf) 2 (0.2 mmol, 64 mg), DABCO (5 mmol, 560 mg), compound 1a (2 mmol, 384 mg), compound 2a (3 mmol, 342 mg), t BuONO (3 mmol, 309 mg), cyclohexane (10.0 mL). Then the system was heated at 80 °C in air for about 12 hours, extracted with ethyl acetate (40 mL × 3), and the product 3a was obtained by simple column chromatography with a yield of 63%. The main test data of the obtained product are as follows. It can be seen from the analysis that the actual synthetic product is consistent with the theoretical analysis.
[0036] 1 H NMR (400 MHz, CDCl 3 ) δ 8.02 – 7.87 (m, 2H), 7.58 – 7.45 (m, 3H), 4.48 (q, J = 7.1 Hz, 2H), 4.35 (q, J = 7.1 Hz, 2H), 1.43 (t, J = 7.2 Hz, 3H), 1.32 (t, J = 7.1 Hz, 3H); 13 C NMR (101 MHz, CDCl 3 ) δ 171.4, 160.8, 159.7, 156.2, 131.7, 128.6, 128.4, 125.6, 108.4, 62.6, 61.7, 13.9, 13.7; HRMS (ESI-TOF): Anal. Calcd. For C 15 H 15 NO 5 : 312.0842,...
Embodiment 2
[0038]
[0039] Cu(OAc) was charged into the reaction flask in turn 2 (0.15 mmol, 27 mg), Mg(OTf) 2(0.2 mmol, 64 mg), DABCO (5 mmol, 560 mg), compound 1a (2 mmol, 384 mg), compound 2a (3 mmol, 342 mg), t BuONO (3 mmol, 309 mg), cyclohexane (10.0 mL). Then the system was heated at 80 °C in air for about 12 hours, extracted with ethyl acetate (40 mL × 3), and the product 3a was obtained by simple column chromatography with a yield of 71%. The main test data of the prepared product are as in Example 1, and the analysis shows that the actual synthetic product is consistent with the theoretical analysis.
Embodiment 3
[0041]
[0042] Cu(OAc) was charged into the reaction flask in turn 2 .H 2 O (0.15 mmol, 30 mg), Mg(OTf) 2 (0.2 mmol, 64 mg), DABCO (5 mmol, 560 mg), compound 1a (2 mmol, 384 mg), compound 2a (3 mmol, 342 mg), t BuONO (3 mmol, 309 mg), cyclohexane (10.0 mL). Then, the system was heated at 80 °C in air for about 12 hours, extracted with ethyl acetate (40 mL × 3), and the product 3a was obtained by simple column chromatography with a yield of 80%. The main test data of the prepared product are as in Example 1, and the analysis shows that the actual synthetic product is consistent with the theoretical analysis.
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