Improved enamine-type addition of dehydroaporphine using microwave irradiation

Wei J. Huang, Chih Chiang Huang, Ling W. Hsin, Yeun M. Tsai, Chin Ting Lin, Jung Hsin Lin, Shoei Sheng Lee

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2 Citations (Scopus)


Previous report demonstrated that 7-substituted aporphine, possessing interesting biological aspects, could be synthesized via an enamine-type addition of dehydroaporphine reacted with an electrophile, but it has the drawbacks of a long reaction time, low yield, and limitation to reactive electrophiles. Here we found that the reaction time and yield could greatly be improved under microwave irradiation in the presence of 4 equiv of sodium iodide for the synthesis of 7-benzyl dehydroglaucine. The application of this finding for treating dehydroglaucine with a variety of alkyl bromides also gave corresponding 7-substituted dehydroglaucines (2a-j) with yields of 14-89%. Other enamines such as 1,10-dimethoxydehydroaporphine (3a), 2,9-diacetyldehydroboldine (3b), and 7,8-dihydroberberine (5) were found to react with benzyl bromide under similar conditions as described above to give corresponding products (4a-b, 6) in satisfactory yields, indicating the versatility of this improved reaction condition.

Original languageEnglish
Pages (from-to)3062-3064
Number of pages3
JournalTetrahedron Letters
Issue number23
Publication statusPublished - Jun 9 2010

ASJC Scopus subject areas

  • Biochemistry
  • Organic Chemistry
  • Drug Discovery


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