Synthesis of Eupolauramine via an Intramolecular Kondrat'eva Pyridine Synthesis

Jeremy I. Levin, Steven M. Weinreb

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

A strategy has been tested for synthesis of annulated pyridines which involves the intramolecular Diels-Alder cycloaddition of an oxazole with an alkene. Oxazole 21 was prepared in four steps from (o-methoxyphenyl)oxazoline 16. Upon heating, 21 produced mixtures of two tricyclic hydroxypyridines 23 and 24 in good total yield. Thermolysis of 21 in the presence of DBN changed the course of the reaction, leading to the desired tricyclic pyridine 25. Two short routes have been developed for conversion of 25 to the structurally unique azaphenanthrene alkaloid eupolauramine (6a). The first sequence involved intermediate azaphenanthrene-o-quinone 30 and hydroxy lactam 31 (Scheme IV). A more efficient route from 25 utilized the azaarene epoxide 33, which was converted via lactam alcohol 34a to eupolauramine.

Original languageEnglish (US)
Pages (from-to)4325-4332
Number of pages8
JournalJournal of Organic Chemistry
Volume49
Issue number23
DOIs
StatePublished - Mar 1984

All Science Journal Classification (ASJC) codes

  • Organic Chemistry

Fingerprint Dive into the research topics of 'Synthesis of Eupolauramine via an Intramolecular Kondrat'eva Pyridine Synthesis'. Together they form a unique fingerprint.

Cite this