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Synthesis 2003(11): 1705-1706
DOI: 10.1055/s-2003-40886
DOI: 10.1055/s-2003-40886
PAPER
© Georg Thieme Verlag Stuttgart ˙ New York
Enantioselective Synthesis of Protoberberine Alkaloids via (-)-Sparteine-mediated Asymmetric Condensation-Cyclisation of o-Toluamide Anions with 3,4-Dihydroisoquinolines
Further Information
Received
30 June 2003
Publication Date:
25 July 2003 (online)
Publication History
Publication Date:
25 July 2003 (online)
Abstract
The first asymmetric synthesis of protoberberine alkaloids based upon the (-)-sparteine-mediated lateral metalation of o-toluamides and subsequent addition-cyclisation with 3,4-dihydroisoquinolines is described (up to 77% ee).
Key words
anion addition - (-)-sparteine - 3,4-dihydroisoquinoline - asymmetric synthesis - protoberberine
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