| Literature DB >> 12381175 |
Douglass F Taber1, Timothy D Neubert, Arnold L Rheingold.
Abstract
The preparation of the diastereomerically pure beta-tetralone ketal 4 is reported. Intramolecular alkylidene C-H insertion followed by hydrolysis of 4 proceeded to give the enantiomerically pure cyclopentene 15. The key step in this synthesis was the bis-intramolecular cyclization of keto aldehyde 2 to give the tetracyclic intermediate 20. Enone 20 was converted over several steps to (-)-morphine 1.Entities:
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Year: 2002 PMID: 12381175 DOI: 10.1021/ja027882h
Source DB: PubMed Journal: J Am Chem Soc ISSN: 0002-7863 Impact factor: 15.419