申请人:Lonza A.G.
公开号:US06156893A1
公开(公告)日:2000-12-05
A novel process for the preparation of (1S,4R)- or (1R,4S)-4-(2-amino-6-chloro-9H-purin-9-yl)-2-cyclo-pentene-1-methanol of the formulae ##STR1## is described. This entails in the first stage (.+-.)-2-aza-bicyclo[2.2.1]hept-5-en-3-one of the formula ##STR2## being acylated to give a (.+-.)-2-azabicyclo[2.2.1]hept-5-en-3-one derivative of the general formula ##STR3## in which R.sup.1 denotes C.sub.1-4 -alkyl, C.sub.1-4 -alkoxy, aryl or aryloxy, the latter being reduced in the second stage to give a cyclopentene derivative of the general formula ##STR4## in which R.sup.1 has the stated meaning, the latter then being converted in the third stage biotechnologically into the (1R,4S)- or (1S,4R)-1-amino-4-(hydroxymethyl)-2-cyclopentene of the formula ##STR5## the latter being converted in the fourth stage with N-(2-amino-4,6-dichloro-5-pyrimidinyl)formamide of the formula ##STR6## into the (1S,4R)- or (1R,4S)-4-[(2-amino-6-chloro-5-formamido-4-pyrimidinyl)amino]-2-cyclopente ne-1-methanol of the formulae ##STR7## and the latter being cyclized in the fifth stage in a known manner to the final product of the formula I or II.
本发明描述了一种制备式为##STR1##的(1S,4R)-或(1R,4S)-4-(2-氨基-6-氯-9H-嘌呤-9-基)-2-环戊烯-1-甲醇的新工艺。其中,第一阶段涉及将式为##STR2##的(.+-.)-2-氮杂双环[2.2.1]庚-5-烯-3-酮酰化,得到一般式为##STR3##的(.+-.)-2-氮杂双环[2.2.1]庚-5-烯-3-酮衍生物,其中R.sup.1表示C.sub.1-4-烷基、C.sub.1-4-烷氧基、芳基或芳氧基,在第二阶段中,后者被还原为一般式为##STR4##的环戊烯衍生物,其中R.sup.1具有上述含义,然后在第三阶段中通过生物技术将后者转化为式为##STR5##的(1R,4S)-或(1S,4R)-1-氨基-4-(羟甲基)-2-环戊烯,最后在第五阶段中将后者环化为式为I或II的最终产物。第四阶段中,将式为##STR6##的N-(2-氨基-4,6-二氯-5-嘧啶基)甲酰胺与后者反应,得到式为##STR7##的(1S,4R)-或(1R,4S)-4-[(2-氨基-6-氯-5-甲酰胺-4-嘧啶基)氨基]-2-环戊烯-1-甲醇。