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Synthesis 2011(6): 929-933
DOI: 10.1055/s-0030-1258444
DOI: 10.1055/s-0030-1258444
PAPER
© Georg Thieme Verlag
Stuttgart ˙ New York
Total Synthesis of the Natural Carbazoles Glycozolicine, Mukoline, and Mukolidine, Starting from 4,5-Dimethyleneoxazolidin-2-ones
Further Information
Received
19 November 2010
Publication Date:
18 February 2011 (online)
Publication History
Publication Date:
18 February 2011 (online)
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Abstract
A novel and efficient synthesis of naturally occurring 1-methoxycarbazoles glycozolicine, mukolidine, and mukoline is developed by applying a regioselective Diels-Alder reaction of a 4,5-dimethyleneoxazolidin-2-one with acrolein. The cycloadduct is transformed to the corresponding functionalized diarylamine. The key palladium-catalyzed cyclization/deformylation cascade reaction of the latter leads to glycozolicine in high overall yield. Oxidation of the C6 methyl group provides the 6-formylcarbazole mukolidine, which is reduced to the respective natural alcohol mukoline.
Key words
1-methoxycarbazoles - 4,5-dimethyleneoxazolidin-2-one - glycozolicine - mukolidine - mukoline - palladium(II) cyclization - decarbonylation
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