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Synthesis method of 6-iodine-1H-indazole

A synthetic method and indazole technology, applied in the field of synthesis of 6-iodo-1H-indazole, can solve the problems of large pollution, long steps, low yield of synthetic route, etc., and achieve low impurity content, stable process and smooth operation flow simple effect

Inactive Publication Date: 2019-05-17
安徽诺全药业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is to provide a synthetic method of 6-iodo-1H-indazole, which is used to solve the technical defects of low yield, large pollution and long steps of the existing synthetic route

Method used

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  • Synthesis method of 6-iodine-1H-indazole
  • Synthesis method of 6-iodine-1H-indazole
  • Synthesis method of 6-iodine-1H-indazole

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A kind of synthetic method of 6-iodo-1H-indazole, synthetic route is as follows:

[0029]

[0030] The synthetic method of above-mentioned 6-iodo-1H-indazole comprises the following steps:

[0031] Weigh 5.0g of the compound of formula V and 13.38g of potassium iodide in the reactor, add 50mL of 1,4-dioxane, and then add 0.2g of tetrabutylammonium iodide, based on the compound of formula V, 0.51g Cuprous iodide and 0.47g N,N-dimethylethylenediamine (0.2equiv.) were added to the reactor, the temperature was raised to reflux, and the reflux reaction was carried out for 48h. After the reaction was completed, the reaction solution was filtered after cooling down to room temperature. , Wash the filter cake 3 times with 4-dioxane, combine the filtrates, concentrate the obtained filtrate, dissolve the concentrate in ethyl acetate, wash the ethyl acetate layer with 13% ammonia solution, separate the organic phase, concentrate the organic phase, and concentrate After recryst...

Embodiment 2

[0033] A kind of synthetic method of 6-iodo-1H-indazole, synthetic route is as follows:

[0034]

[0035] The synthetic method of above-mentioned 6-iodo-1H-indazole comprises the following steps:

[0036] Weigh 4.5g of the formula V compound and 12.05g of potassium iodide in the reactor, add 45mL of 1,4-dioxane, add 0.22g of tetrabutylammonium iodide, in terms of the formula V compound, 0.3equiv The cuprous iodide and N,N-dimethylethylenediamine were added to the reactor, the temperature was raised to reflux, and the reflux reaction was carried out for 54 hours. Wash the filter cake 3 times with six rings, combine the filtrate, concentrate the obtained filtrate, dissolve the concentrate with ethyl acetate, wash the ethyl acetate layer with 20% ammonia solution, separate the organic phase, concentrate the organic phase, and reconcentrate the concentrate with acetonitrile After crystallization, the compound of formula IV, 6-iodo-1H-indazole, was obtained with a yield of 84.2...

Embodiment 3

[0038] A kind of synthetic method of 6-iodo-1H-indazole, synthetic route is as follows:

[0039]

[0040] The synthetic method of above-mentioned 6-iodo-1H-indazole comprises the following steps:

[0041] Weigh 5.5g of formula V compound and 14.71g of potassium iodide in the reactor, add 55mL of 1,4-dioxane, add 0.18g of tetrabutylammonium iodide, in terms of formula V compound, 0.1equiv The cuprous trifluoromethanesulfonate and N,N-dimethylethylenediamine were added to the reactor, the temperature was raised to reflux, and the reflux reaction was carried out for 46 hours. After the reaction was completed, after cooling down to room temperature, the reaction liquid was filtered, and the obtained filtrate was concentrated. After the concentrate was dissolved in ethyl acetate, the ethyl acetate layer was washed with 10% ammonia solution, the organic phase was separated, the organic phase was concentrated, and the concentrate was recrystallized from acetonitrile to obtain the ...

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Abstract

The invention discloses a synthesis method of 6-iodine-1H-indazole. A synthesis route is shown as follows (a picture shown in the description). A compound shown as a formula V is used as a starting material to replace bromine atoms on a parent nucleus of the compound shown as the formula V under the action of an iodinating agent and a catalyst to obtain a target product. The process route disclosed by the invention effectively overcomes the design defects of the existing synthesis route. A 6-iodine-1H-indazole compound is prepared by an environment-friendly process with fewer synthesis steps,high yield, short production cycle and low impurity content.

Description

technical field [0001] The invention relates to the technical field of mechanical synthesis and pharmaceutical intermediates, in particular to a method for synthesizing 6-iodo-1H-indazole. Background technique [0002] Axitinib, developed by Pfizer Pharmaceuticals of the United States, was approved for marketing in the United States on January 27, 2012. It is a multi-target potent and selective tyrosine kinase inhibitor for the treatment of other systems Treatment-refractory advanced kidney cancer. However, at present, the synthetic route of axitinib raw materials and intermediates is long, the yield is low, the process cost and energy consumption are large, and the structure of axitinib is as follows:. [0003] [0004] 6-iodo-1H-indazole is used as a key intermediate for the synthesis of axitinib, and its structure is shown in formula IV: [0005] [0006] The prior art discloses a synthetic method about the compound, and its synthetic route is as follows: [0007...

Claims

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Application Information

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IPC IPC(8): C07D231/56
Inventor 钱祝进胡志刚许良志何大荣杜小鹏何勇陈越磊
Owner 安徽诺全药业有限公司
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