Efficient Construction of Stereodefined α-Alkylidene Aza-cycloketones via β-Amino-alkenyllithium: Straightforward and Protection-Free Synthesis of Allopumiliotoxin 267A
摘要:
Intramolecular nucleophilic acyl substitution of highly functionalized beta-amino-alkenyllithium species provided facile access to alpha-alkylidene aza-cycloketones with defined olefin geometry and rich structural diversity. A concise total synthesis of allopumiliotoxin 267A has been accomplished in 5 steps from 4 featuring this key transformation.