Figure 3: Preparation of key building block 7.
From: A unified strategy for the synthesis of highly oxygenated diaryl ethers featured in ellagitannins
DBDMH, 1,3-dibromo-5,5-dimethylhydantoin; DIBAL-H, diisobutylaluminium hydride; Me, methyl; M-sieve, molecular sieves; PIFA, [bis(trifluoroacetoxy)iodo]benzene.
