The phthalideisoquinoline system has been synthesized from substituted 2-phenyl-1,3-indandiones as starting materials. The key step in the synthesis is the rearrangement of the spirobenzylisoquinoline ring system to the phthalideisoquinoline system. The diastereomeric cordrastines, I and II, have been synthesized by this method and their relative configurations have been established by comparison of their p.m.r. spectra with those of phthalideisoquinoline alkaloids of known configuration.
苯甲酮异喹啉系统已经从取代的2-苯基-1,3-茚酮合成为起始原料。合成中的关键步骤是将螺苯基异喹啉环系统重新排列为苯甲酮异喹啉系统。通过这种方法合成了异构的cordrastines,I和II,并通过比较它们的p.m.r.光谱与已知构型的苯甲酮异喹啉生物碱的光谱来确定它们的相对构型。