The pot, atom, and step-economic synthesis of Rosettacin topo-I poison and its derivatives has been achieved using a novel domino N-amidoacylation/aldol-typecondensation, followed by decarboxylation of the ester function. The key domino procedure simply involves mixing HOBt ester as new reagent with lactam and NaH together in THF or THF/ DMF. The reaction seems to be general and led to suitable N-heterocyclic
An Approach toward Isoindolobenzazepines Using the Ammonium Ylide/Stevens [1,2]-Rearrangement Sequence
作者:Albert Padwa、L. Scott Beall、Cheryl K. Eidell、Kimberly J. Worsencroft
DOI:10.1021/jo001684w
日期:2001.4.1
rearranged product derived from an ammoniumylide intermediate could be detected in the crude reaction mixture. In contrast to this result, reaction of the related diazo dihydroisoquinoline amide 46 with Rh2(OAc)4 afforded the isoindolobenzazepine ring system in high yield. Formation of the 5,7-fused skeleton was rationalized in terms of a spirocyclicammoniumylide that underwent a preferential Stevens