This invention relates to the compounds of the formula [I] which are useful for the treatment of cataracts, and the synthetic intermediates of the formula [II],
wherein
R¹ is hydroxy which can be protected by a hydroxy protective group;
R² is lower alkyl;
R³ is hydrogen, lower alkyl, hydroxy, which can be protected by a hydroxy protective group, or lower alkoxy, and the said lower alkyl can be substituted by hydroxy, which can be protected by a hydroxy protective group, amino or lower alkylamino;
R⁴ is carboxy which can be converted into ester or amide; tetrazolyl; phosphono which can be converted into ester or amide; or sulfonyl which can be converted into ester or amide;
A is alkylene;
B is C=O, C=S or CH₂, and
is single bond or double bond.
本发明涉及可用于治疗白内障的式[I]化合物和式[II]合成中间体、
其中
R¹ 是羟基,可被羟基保护基团保护;
R² 是低级烷基
R³ 是氢、低级烷基、可被羟基保护基团保护的羟基或低级烷氧基,且上述低级烷基可被可被羟基保护基团保护的羟基、
氨基或低级烷基
氨基取代;
R⁴ 是羧基,可转化为酯或酰胺;
四唑基;膦酰基,可转化为酯或酰胺;或磺酰基,可转化为酯或酰胺;
A 是亚烷基;
B 是 C=O、C=S 或 CH₂,以及
是单键或双键。