Improved syntheses of shihunine, the spiro phthalide pyrrolidine alkaloid
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)