申请人:Eli Lilly and Company
公开号:US05969136A1
公开(公告)日:1999-10-19
This invention provides a process for preparing a compound of formula III ##STR1## wherein R.sup.1 is bromo, iodo or COOR.sup.2 ; R.sup.2 is H, C.sub.1 -C.sub.4 alkyl, phenyl which may be substituted or benzyl; and A is a 5- or 6-membered aromatic residue which may contain up to three hetero atoms and which may optionally be substituted with one or two groups selected from the group consisting of halo, hydroxy, C.sub.1 -C.sub.4 alkyl, and C.sub.1 -C.sub.4 alkoxy; or a salt thereof, which comprises (a) reacting a compound of formula I ##STR2## wherein R is C.sub.1 -C.sub.4 alkyl or phenyl which may be substituted; and R.sup.1, R.sup.2, and A are as defined above; or a salt thereof, with a sulfurization agent; (b) cyclizing the reaction product from step (a) with guanidine; and (c) optionally salifying the reaction product from step (b).
本发明提供了一种制备公式III化合物的方法,其中R.sup.1是溴、碘或COOR.sup.2;R.sup.2是H、C.sub.1-C.sub.4烷基、苯基(可以被取代)或苄基;A是一个含有最多三个杂原子的5-或6-成员芳香残基,可以选用一个或两个从卤素、羟基、C.sub.1-C.sub.4烷基和C.sub.1-C.sub.4烷氧基组成的基团进行取代;或其盐。该方法包括(a)将公式I化合物与硫化剂反应;(b)用脲环化步骤(a)的反应产物;(c)可选地使步骤(b)的反应产物成盐。