The octahydroisoindolone moiety related to proxiphomin (1) has been synthesized by condensation of N-benzyloxycarbonyl-protected D, L-phenylalaninal (7) with methyl-(4-methyl-sorbyl)-malonate (11) to yield the branched ethylene derivative 12. Consecutive intramolecular [2+4]-cycloaddition and lactam ring closure of 12 gave the desired octahydroisoindolone derivative 15, possessing adaptable functional
通过将N-苄氧基羰基保护的D,
L-苯丙氨酸(7)与甲基-(4-甲基-山梨基)-
丙二酸酯(11)缩合,合成支链
乙烯衍
生物12,从而合成了与脯
氨酰胺(1)相关的八氢异
吲哚酮部分。连续的分子内[2 + 4]-环加成和内酰胺环的闭合为12,得到所需的八氢异
吲哚酮衍
生物15,其具有适用于大环系统连接的适应性官能团。