The present invention relates to novel optically active isoxazole derivatives represented by general formula: ##STR1## which are useful as intermediates for synthesis of prostaglandin and a process for producing the same as well as novel aldehyde compounds represented by general formula: ##STR2## which are intermediates for preparing the compounds [XI] described above and a process for preparation thereof. In the compounds shown by these formulae, R.sup.1 represents an alkyl group or a cycloalkyl group which may have an alkoxy group or a group shown by --Ra--A--B (wherein Ra is an alkyl group; A is a hetero atom or an single bond; and B is an aromatic or hetero ring which may have a substituent(s)); and R.sup.2 and R.sup.3, which may be the same or different, each represents an aralkyl group, a silyl group or an acyl group.
本发明涉及一种新型光学活性
异噁唑衍
生物,其通式表示为:##STR1## 该衍
生物可用作合成
前列腺素的中间体,以及生产该衍
生物的方法。本发明还涉及一种新型醛化合物,其通式表示为:##STR2## 该醛化合物是制备上述化合物[XI]的中间体,以及制备它们的方法。在这些式子中,R1代表一个烷基或环烷基,其中可以有一个烷氧基或由--Ra--A--B表示的基团(其中Ra是烷基;A是杂原子或单键;B是芳香环或杂环,可以有一个或多个取代基);R2和R3可以相同也可以不同,每个代表一个芳基烷基、
硅基或酰基。