Synthesis method of 6-chloropurine

A synthetic method and technology of chloropurine, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, organic chemistry, etc., can solve problems such as difficult and accurate measurement, pollution, equipment corrosion, etc., and achieve the elimination of safety Large hidden dangers, simple and safe operation, avoiding high cost

CN101602766AInactive Publication Date: 2009-12-16ZHEJIANG UNIV OF TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2009-12-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a synthesis method of 6-chloropurine as shown in formula II. The method comprises the following steps that bis(trichloromethyl)carbonate and hypoxanthine shown in formula I are taken as raw materials to react for 4 to 10 hours in organic solvent under the action of organic amine catalyst at a temperature of between 0 and 150 DEG C; a filter mass is taken out after filtration to obtain 6-chloropurine hydrochlorate and then is dissolved in ice water; the pH value of the solution is adjusted between 7 and 9 by alkali to precipitate the 6-chloropurine, and the filtrate is eliminated through filtration so as to obtain the 6-chloropurine after drying; and the ratio of the reactants, namely the hypoxanthine: the bis(trichloromethyl)carbonate: the organic amine catalyst is equal to 1:0.33-0.66:0.1-1. The synthesis method has the advantages of simple and safe operation, higher reaction yield, low production cost and simple post treatment; moreover, the method technically eliminates the problems of the prior method including great hidden danger, serious three-waste pollution, and the like, thereby having higher practical value.
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Description

(1) Technical field

[0001] The invention relates to a synthesis method of 6-chloropurine, in particular to a synthesis method using bis(trichloromethyl)carbonate as one of the raw materials. (2) Background technology

[0002] 6-Chloropurine is one of the main intermediates in the synthesis of adenine, and it can be adenine after amination at the 6-position. Adenine, the chemical name is 6-aminopurine, and its derivatives are widely used in the fields of medicine and agricultural chemicals. For example, it is a synthetic vitamin B 4 (Adenine phosphate) main raw material; Adefovir dipivoxil (Adefovirdi-pivoxil, 9-[2-[bis(pivaloyloxymethoxy)phosphonomethoxy]ethyl) developed by Gilead sciences company in the United States Base] adenine), approved by FDA in September 2002, has become a new nucleoside analog drug for the treatment of hepatitis B, which can effectively inhibit the replication of hepatitis B virus DNA chain after oral administration; in 1992, Huber S. found that 8...

Examples

Embodiment 1

[0017] The amount ratio hypoxanthine of feeding material: two (trichloromethyl) carbonate: organic amine catalyst is 1: 0.36: 0.2, and hypoxanthine feeding amount is 2.74g (0.02mol), two (trichloromethyl) carbonic acid The ester charging amount is 2.16g (0.0072mol), the organic amine catalyst is triethylamine, the consumption is 0.41g (0.004mol), the organic solvent is toluene, and the consumption is 10 times (27.4g) of hypoxanthine quality.

[0018] First, triethylamine was dissolved in 10g of toluene, cooled in an ice bath, and the toluene solution of bis(trichloromethyl)carbonate was slowly added dropwise (2.16g of bis(trichloromethyl)carbonate was dissolved in 17.4g of toluene), Control the rate of addition to keep the temperature of the reaction solution at 0~5°C. After the dropwise addition, continue to stir for half an hour; add hypoxanthine and continue to stir, and keep the reaction at 0~5°C for 3 hours; remove the ice bath, and stir for half an hour at room temperatur...

Embodiment 2

[0021] The amount ratio hypoxanthine of feeding material: two (trichloromethyl) carbonate: organic amine catalyst is 1: 0.5: 0.3, and hypoxanthine feeding amount is 2.74g (0.02mol), two (trichloromethyl) carbonic acid The ester charging amount is 3.0g (0.01mol), the organic amine catalyst is N-methylpyrrole, the consumption is 0.48g (0.006mol), the organic solvent is xylene, and the consumption is 10 times (27.4g) of hypoxanthine quality.

[0022] First dissolve pyridine in 10g of toluene, cool in an ice bath, slowly add a toluene solution of bis(trichloromethyl)carbonate (3.0g of bis(trichloromethyl)carbonate dissolved in 17.4g of toluene) dropwise, and drop Acceleration keeps the temperature of the reaction solution at 0-5°C. After the dropwise addition, continue to stir for half an hour; add hypoxanthine, and maintain the reaction at 0-5°C for 2 hours; remove the ice bath, stir and react at room temperature for half an hour, and then heat up to 110 DEG C (to reflux) reactio...

Embodiment 3

[0024]The amount ratio hypoxanthine of feed material: bis(trichloromethyl) carbonate: organic amine catalyst is 1: 0.4: 0.4, hypoxanthine feeding amount is 2.74g (0.02mol), bis(trichloromethyl) carbonic acid The ester charging amount is 2.4g (0.008mol), the organic amine catalyst is N-methylpyrrole, the consumption is 0.65g (0.008mol), the organic solvent is chlorobenzene, and the consumption is 20 times (54.8g) of hypoxanthine quality.

[0025] First dissolve N-methylpyrrole in 20g of chlorobenzene, cool in an ice bath, and slowly add a chlorobenzene solution of bis(trichloromethyl)carbonate (2.4g of bis(trichloromethyl)carbonate dissolved in 34.8 g chlorobenzene), control the rate of addition to keep the temperature of the reaction solution at 0~5°C, after the dropwise addition, continue to stir for half an hour; put in hypoxanthine, and keep the reaction at 0~5°C for 4 hours; remove the ice bath, and stir at room temperature React for half an hour, then heat up to 132°C (to...