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.
本发明涉及一种2-
氨基-9-(2-取代乙基)
嘌呤的新化合物及利用该化合物制备9-[4-乙酰
氧基-3-(乙酰
氧甲基)丁-1-基]-
2-氨基嘌呤(famciclovir)的有效方法。本发明所述的2-
氨基-9-(2-取代乙基)
嘌呤由以下式子(II')表示:(式子II'),其中R是羟基、卤素、mesyloxy或tosyloxy基团。本发明的famciclovir制备方法包括以下步骤:卤化2-
氨基-9-(2-取代乙基)
嘌呤以得到2-
氨基-9-(2-卤代乙基)
嘌呤,然后将卤代化合物与
乙酰丙酮酸二
乙酯反应。本发明的制备方法可利用2-
氨基-9-(2-取代乙基)
嘌呤这种新化合物高选择性地制备出具有有效抗病毒活性的
嘌呤衍
生物药物famciclovir,纯度可达100%。此外,本发明的方法可利用相对温和的反应条件,因此具有较高的工业过程效率。