Studies on the syntheses of heterocyclic compounds. Part 876. The chiral total synthesis of brevianamide E and deoxybrevianamide E
作者:Tetsuji Kametani、Naoaki Kanaya、Masataka Ihara
DOI:10.1039/p19810000959
日期:——
The chiral total synthesis of brevianamide E (1) and deoxybrevianamide E (2) starting from L-proline is described. Condensation of 2-(1,1-dimethylallyl)-3-dimethylaminomethylindole (3) and (–)-methyl 1,4-dioxoperhydropyrrolo[1,2-a]pyrazine-3-carboxylate (7) derived from L-proline followed by demethoxycarbonylation gave (–)-deoxybrevianamide E (2) and its epimer (10). Photo-oxygenations of (2) and (10)
描述了从L-脯氨酸开始的手性总的brevianamide E(1)和deoxybrevianamide E(2)的合成。衍生自L-脯氨酸的2-(1,1-二甲基烯丙基)-3-二甲基氨基甲基吲哚(3)和(–)-甲基1,4-二氧杂氢吡咯并[1,2 - a ]吡嗪-3-羧酸酯(7)的缩合反应通过脱甲氧基羰基化得到(-)-脱氧短戊酰胺E(2)及其差向异构体(10)。(2)和(10)的光氧合形成了(–)-brevianamide E(14)及其三个立体异构体(15),(16)和(17)。通过该合成将布雷维酰胺E(14)的绝对立体化学确定为4a S,5a R,10a S,11a S。