申请人:Pfizer Inc.
公开号:US05916902A1
公开(公告)日:1999-06-29
This invention relates to a process for preparing the compound having the formula ##STR1## which comprises i) heating the compound of formula ##STR2## wherein R.sup.3 is R.sup.4 or benzyl and R.sup.4 is R.sup.5 C(.dbd.O), R.sup.5 C(.dbd.O) or R.sup.5 SO.sub.2 wherein R.sup.5 is (C.sub.1 -C.sub.6)alkyl or (C.sub.6 -C.sub.10)aryl(C.sub.1 -C.sub.6)alkyl; at an elevated temperature in the presence of a base with the proviso that when R.sup.3 in the resultant product is R.sup.4 said product is ii) further treated with an aqueous mineral acid at an elevated temperature followed by iii) treatment of the product of ii) with a) a benzylating agent in the presence of a base or b) benzaldohyde in the presence of a reducing agent and an acid.
本发明涉及一种制备具有以下式子的化合物的方法:##STR1## 其中,i)在碱的存在下在高温下加热具有以下式子的化合物:##STR2## 其中,R.sup.3为R.sup.4或苄基,R.sup.4为R.sup.5 C(.dbd.O)、R.sup.5 C(.dbd.O)或R.sup.5 SO.sub.2,R.sup.5为(C.sub.1-C.sub.6)烷基或(C.sub.6-C.sub.10)芳基(C.sub.1-C.sub.6)烷基;但是当所得产物中R.sup.3为R.sup.4时,该产物需要进行ii)进一步处理,即在高温下用水矿酸处理,然后再用a)苄基化试剂在碱的存在下处理或b)苯甲醛在还原剂和酸的存在下处理。