Regio- and Stereoselectivity in the Titanium-Mediated Cyclopropanation of ω-Alkenoic Diesters: Application in the Diastereoselective Synthesis of Pyrrolidinone
作者:Jean Ollivier、Jean-Marc Garnier、Mouhamad Jida
DOI:10.1055/s-2006-950268
日期:2006.10
The titanium-mediated intramolecular cyclopropanation of ω-allylic succinates leads only to cyclopropanol, arising from exclusive reactivity of one ester function. As an extension of this methodology, the diastereoselectivesynthesis of highly functionalized pyrrolidinone has been realized from cheap commercially available L-aspartic acid.
The core of daphnilactone B-type and yuzurimine-type alkaloids was synthesized in only 16 steps from a known β-allyl-γ-butyrolactone. The key sequence of Vilsmeier–Haack cyclization and intramolecular azomethine ylide cycloaddition allowed the construction of, in a single step, three of the five rings common to all alkaloids found in both of these classes with perfect chemocontrol.