作者:Vinayak G. ore、Mahendra D. hordia、Nurani S. arasimhan
DOI:10.1016/s0040-4020(01)82029-9
日期:1990.1
describes the syntheses of the spiro-alkaloid shihunine (1) by three different approaches. In the first, phthalic anhydride was condensed with N-methyl-2-pyrrolidone and the resulting phthalide 8 was hydrolysed to shihunine. In the second, phthalic anhydride was converted to the alkylidine phthalide 10 using Wittig reaction and then to 5 and finally to shihunine. In the third, methyl-2-formylbenzoate (16)
本文通过三种不同的方法描述了螺-生物碱shihunine(1)的合成。首先,将邻苯二甲酸酐与N-甲基-2-吡咯烷酮缩合,并将所得的邻苯二甲酸酯8水解为石碱。在第二步中,使用Wittig反应将邻苯二甲酸酐转化为亚烷基邻苯二甲酸酯10,然后转化为5,最后转化为石碱。在第三种方法中,将-2-甲酰基苯甲酸甲酯(16)与均烯酸锌缩合,得到邻苯二甲酸酯20,然后将其氧化成21,然后环化成双内酯14。14被转化成5至15,最后变成shihunine 。