A process for the preparation of famciclovir a compound of Formula (I) and its intermediates.
一种制备 famciclovir(化合物式(I))及其中间体的方法。
[EN] PROCESS FOR PREPARING 9-[4-ACETOXY-3-(ACETOXYMETHYL)BUT-1-YL]-2-AMINOPURINE<br/>[FR] PROCEDE DE PREPARATION DE 9-[4-ACETOXY-3-(ACETOXYMETHYL)BUT-1-YL]-2-AMINOPURINE
申请人:KYUNGDONG PHARM CO LTD
公开号:WO2004007497A1
公开(公告)日:2004-01-22
Disclosed is a process for preparing 9-[4-acetoxy-3-(acetoxymethyl)but-1-yl]-2-aminopurine (called Famciclovir), a drug of purine derivatives having antiviral activity. This process comprises reacting 2-aminopurine with 2-acetoxymethyl-4-bromobut-1-yl-acetate in the presence of thallium (I) ethoxide to give the desired compound. According to this process, the desired compound can be prepared in very high selectivity and purity under mild reaction conditions.
[EN] 2-AMINO-9-(2-SUBSTITUTED ETHYL)PURINES AND PREPARING METHODS FOR 9-[4-ACETOXY-3-(ACETOXYMETHYL)BUT-1-YL]- 2- AMINOPURINE USING THE SAME<br/>[FR] 2-AMINO-9-(2-SUBSTITUE ETHYL)PURINES ET PROCEDES DE PREPARATION DE 9-[4-ACETOXY-3-(ACETOXYMETHYL)BUT-1-YL]- 2- AMINOPURINE AU MOYEN DE CELLES-CI
申请人:KYUNGDONG PHARM CO LTD
公开号:WO2004110343A2
公开(公告)日:2004-12-23
The present invention relates to a new compound of 2-amino-9-(2-substituted ethyl)purine and an effective method for preparing 9-[4-acetoxy-3-(acetoxymethyl)but-1-yl]-2-aminopurin (famciclovir) using the same. The 2-amino-9-(2-substituted ethyl)purine according to the invention is represented by the following formula (II'): (Formula II') wherein R is a hydroxy, halogen, mesyloxy or tosyloxy group. The inventive method for the preparation of famciclovir comprises the steps of halogenating 2-amino-9-(2-substituted ethyl)purine to give 2-amino-9-(2-halogenoethyl)purine, and reacting the halogenated compound with diethylmalonate. The inventive preparation method allows famciclovir, a purine derivative drug with effective antiviral activity, to be prepared in a high selectivity of 100% in a pure form by using the inventive new compound of 2-amino-9-(2-substituted ethyl)purine. In addition, the inventive method allows the utilization of relatively mild reaction conditions, and thus, has high industrial process efficiency.
Process for preparing 9-[4-acetoxy-3-(acetoxymethyl)but-1-yl]-2-aminopurine
申请人:Lee Byoung-suk
公开号:US20050222413A1
公开(公告)日:2005-10-06
Disclosed is a process for preparing 9-[4-acetoxy-3-(acetoxymethyl)but-1-yl]-2-aminopurine (called Famciclovir), a drug of purine derivatives having antiviral activity. This process comprises reacting 2-aminopurine with 2-acetoxymethyl-4-bromobut-1-yl-acetate in the presence of thallium (1) ethoxide to give the desired compound. According to this process, the desired compound can be prepared in very high selectivity and purity under mild reaction conditions.
2-Amino-9-(2-substituted ethyl)purines and preparing methods for 9-[4-acetoxy-3-(acetoxymethyl)but-1-yl]-2-aminopurine using the same
申请人:Lee Byoung-Suk
公开号:US20060258862A1
公开(公告)日:2006-11-16
The present invention relates to a new compound of 2-amino-9-(2-substituted ethyl)purine and an effective method for preparing 9-[4-acetoxy-3-(acetoxymethyl)but-1-yl]-2-aminopurin (famciclovir) using the same. The 2-amino-9-(2-substituted ethyl)purine according to the invention is represented by the following formula (II′): (Formula II′) wherein R is a hydroxy, halogen, mesyloxy or tosyloxy group. The inventive method for the preparation of famciclovir comprises the steps of halogenating 2-amino-9-(2-substituted ethyl)purine to give 2-amino-9-(2-halogenoethyl)purine, and reacting the halogenated compound with diethylmalonate. The inventive preparation method allows famciclovir, a purine derivative drug with effective antiviral activity, to be prepared in a high selectivity of 100% in a pure form by using the inventive new compound of 2-amino-9-(2-substituted ethyl)purine. In addition, the inventive method allows the utilization of relatively mild reaction conditions, and thus, has high industrial process efficiency.