Preparation method of 4-amino-7-iodo pyrrolo [2, 1-f] [1, 2, 4] triazine
A technology of aminopyrrole and l-f, which is applied in the direction of organic chemistry, can solve the problems of high consumption of iodine-containing substances, low yield, and many impurities, and achieve the effects of high utilization rate, less by-products, and high reaction yield
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[0037] Based on this, the present invention provides a kind of preparation method of 4-amino-7-iodopyrrolo[2,1-f][1,2,4]triazine, can be divided into following two methods:
[0038] The first method: 4-aminopyrrolo[2,1-f][1,2,4]triazine reacts with hydroiodide and an oxidizing agent to obtain 4-amino-7-iodopyrrolo[2,1 -f][1,2,4]triazine, the reaction formula is as follows:
[0039]
[0040] The second method: 4-aminopyrrolo[2,1-f][1,2,4]triazine reacts with iodine molecules first, and then reacts with an oxidant to obtain 4-amino-7-iodopyrrolo[2, 1-f][1,2,4]triazine, the reaction formula is as follows:
[0041]
[0042] Principle of the present invention is as follows:
[0043]In the first method, an inexpensive oxidizing agent is used to react with hydroiodide to generate reactive molecular iodine, which is then reacted with 4-aminopyrrolo[2,1-f][1,2,4]triazine to obtain the product; in In the second method, molecular iodine is first reacted with 4-aminopyrrolo[2,1-f...
Embodiment 1
[0046] Under nitrogen protection, 3.5g (26.1mmol) of 4-aminopyrrolo[2,1-f][1,2,4]triazine and 4.3g (26.1mmol, 1.0equiv) of potassium iodide were added to 15mL of Methanol, stir well. Cool down to 0°C, add 16.0g (26.1mmol, 1.0equiv) potassium hydrogen persulfate compound salt (Oxone) in equal amounts in batches, and react while feeding for a total of 3 hours. 100 mL of water and 6.5 g of sodium thiosulfate were added, and then the pH value of the reaction solution was adjusted to alkaline with saturated sodium bicarbonate solution. The reaction solution was extracted with ethyl acetate, the organic phase was washed, dried, filtered and desolvated under reduced pressure to obtain 6.0 g of 4-amino-7-iodopyrrolo[2,1-f][1,2,4]triazine (purity greater than 98%, yield 88%).
[0047] That 1 H NMR data are as follows: 1 H-NMR (400MHz, DMSO-d 6 ): 7.91 (s, 1H), 7.90-7.70 (br, 2H), 7.00 (d, J=3.5Hz, 1H), 6.84 (d, J=3.6Hz, 1H).
Embodiment 2
[0049] Under nitrogen protection, 35g (0.261mol) of 4-aminopyrrolo[2,1-f][1,2,4]triazine and 86g (0.522mol, 2.0equiv) of potassium iodide were added to 150mL of methanol , stir well. Cool down to 0°C, add 160g (0.261mol, 1.0equiv) potassium hydrogen persulfate compound salt (Oxone) in equal amounts in batches, and continue the reaction for another 7 hours to complete the reaction. Add 1000 mL of water and 65 g of sodium thiosulfate, and then adjust the pH of the reaction solution to alkaline with saturated sodium bicarbonate solution. Stir, filter, the filtered solid is beaten with water and ethanol, filtered, and vacuum-dried to obtain 61.1g of 4-amino-7-iodopyrrolo[2,1-f][1,2,4]triazine (purity greater than 96 %, yield 90%).
[0050] That 1 H NMR data are as follows: 1 H-NMR (400MHz, DMSO-d 6 ): 7.91 (s, 1H), 7.90-7.70 (br, 2H), 7.00 (d, J=3.5Hz, 1H), 6.84 (d, J=3.6Hz, 1H).
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