Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 87, Issue 12, Pages 7786-7797Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.joc.2c00420
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Funding
- SERB, DST [CRG/2019/000113]
- CSIR, Govt. of India [02(0403)/21/EMR-II]
- CSIR
- IISER Bhopal
- INSPIRE
- [STR/2020/000066]
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A concise asymmetric total synthesis method was reported for naturally occurring Amaryllidaceae alkaloids sharing dihydrobenzofuran scaffolds. Enantioenriched cyclohexene with a quaternary stereogenic center was obtained through orthoester Johnson-Claisen rearrangement of allyl alcohol.
A concise asymmetric total synthesis of naturally occurring Amaryllidaceae alkaloids sharing dihydrobenzofuran scaffolds, (-)-galanthamine (1a), (-)-lycoramine (1b), (-)-narwedine (2a), and (-)-lycoraminone (2b), is reported. Orthoester Johnson-Claisen rearrangement of allyl alcohol (+)-9 (98% ee) in diisopropylethylamine furnished enantioenriched cyclohexene (+)-8 (97.4% ee) with a quaternary stereogenic center.
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