申请人:Novartis AG
公开号:US06043365A1
公开(公告)日:2000-03-28
The compounds of formula I ##STR1## wherein Ar represents biaryl, carbocyclic or heterocyclic aryl, are prepared, as substantially pure enantiomers, by (a) condensing a compound of the formula ##STR2## as a substantially pure enantiomer, wherein Ar has meaning as defined above and R.sub.6 is on O-protecting group with a lower alkyl ester of formic acid; (b) then condensing the compound so obtained with a compound of the formula ##STR3## wherein R.sub.8 is hydrogen or COOR.sub.3 and R.sub.3 is lower alkyl; (c) then cyclizing the compound so obtained to a compound of the formula ##STR4## as a substantially pure enantiomer; (d) and then condensing the compound so obtained (1) with a carbocyclic aroyl isothiocyanate and treatment of the product so obtained with an alkyl halide followed by anhydrous ammonia; or (2) with cyanamide in acid, optionally followed by treatment with a base.
式I的化合物##STR1##其中Ar代表双芳基,碳环或杂环芳基,通过以下步骤制备为基本纯的对映体:(a)缩合式##STR2##作为基本纯的对映体,其中Ar的含义如上定义,R.sub.6是带有低级酸甲酯基的O-保护基;(b)然后缩合所得化合物与式##STR3##其中R.sub.8是氢或COOR.sub.3,R.sub.3是低级烷基;(c)然后将所得化合物环化为式##STR4##作为基本纯的对映体;(d)然后缩合所得化合物(1)与碳环芳酰异硫氰酸酯,并用烷基卤化物处理所得产物,然后用无水氨处理;或者(2)与酸性氰胺缩合,可选择性地再用碱处理。