The invention relates to a process for the preparation of formula (I), which process comprises a) reacting the compound (II), with cyclopentadiene to (III); b) reacting this compound in the presence of an oxidant to the compound of formula (IV); c) hydrogenating this compound in the presence of a metal catalyst and an inert solvent under hydrogen atmosphere to the compound of formula (V); d) reacting this compound in the presence of a Brönsted acid followed by a reducing agent to the compound of formula (VI); e) reacting VI with a compound (VII), in the presence of a base to a compound of formula (VIII); f) converting the compound of formula VIII in the presence of an oxidising agent to the compound of formula (IX); and g) reacting the compound of formula IX in the presence of triphenylphosphane/carbon tetrachloride or triphenylphosphane/bromotrichloromethane to the compound of formula I.
本发明涉及一种制备式(I)的过程,该过程包括以下步骤:a)将化合物(II)与
环戊二烯反应得到化合物(III);b)在氧化剂存在下将该化合物反应得到式(IV)的化合物;c)在
氢气氛围下,在
金属催化剂和惰性溶剂存在下加氢该化合物得到式(V)的化合物;d)在Brönsted酸存在下将该化合物反应得到式(VI)的化合物,然后加还原剂;e)在碱存在下将VI与化合物(VII)反应得到式(VIII)的化合物;f)在氧化剂存在下将化合物VIII转化为式(IX)的化合物;g)在
三苯基膦/
四氯化碳或
三苯基膦/
溴三
氯甲烷存在下将式(IX)的化合物反应得到式(I)的化合物。