Synthesis of (±)-isoretronecanol, (±)-curassanecine, (±)-heliotridane, (±)-tashiromine and (±)-5-epitashiromine via α-(N-carbamoyl)alkylcuprate chemistry

✍ Scribed by R.Karl Dieter; Rhett Watson

• Book ID: 104252086
• Publisher: Elsevier Science
• Year: 2002
• Tongue: French
• Weight: 113 KB
• Volume: 43
• Category: Article
• ISSN: 0040-4039
• DOI: 10.1016/s0040-4039(02)01835-x

✦ Synopsis

Vinylation of N-Boc-2-pyrrolidinylcuprate reagents with functionalized vinyl iodides followed by N-Boc deprotection and cyclization affords 1-methylidine pyrrolizidine and indolizidine carbon skeletons. Functional group manipulation of the exo-cyclic olefin provides direct synthetic entries to the pyrrolizidine alkaloids (±)-isoretronecanol, (±)-curassanecine, (±)-heliotridane or the indolizidine alkaloids (±)-tashiromine and (±)-epitashiromine. This synthetic approach to pyrrolizidine and indolizidine alkaloids requires masking of the tertiary amine during functional group interconversions involving the alkene functionality.