A Highly Stereoselective Synthesis of (−)-(<i>ent</i>)-Julifloridine from the Cyclization of an Alanine-Derived Chloroamine with an Acetylenic Sulfone
作者:Huimin Zhai、Masood Parvez、Thomas G. Back
DOI:10.1021/jo0703101
日期:2007.5.1
The cyclization of γ-chloroamine 11, derivedfrom l-alanine, and acetylenic sulfone 12 afforded the dehydropiperidine 19 via conjugate addition followed by intramolecular alkylation of the corresponding sulfone-stabilized anion. An unexpected acid-catalyzed desulfonylation of 19 occurred in one step via desilylation and tautomerization of the enamine moiety to the corresponding aldehyde, followed by