 we have prepared two new diastereoisomeric 
 2-aza-5-phosphabicyclo[2.2.1]heptanes 
 from naturally occurring trans-4-hydroxy - l - proline in six chemical operations . 
 these syntheses are concise 
 and highly efficient , with straightforward purification . when we used 
 these chiral phosphines as catalysts for reactions of -substituted 
 allenoates with imines , we obtained enantiomerically enriched pyrrolines 
 in good yields with excellent enantioselectivities . 
 these two diastereoisomeric 
 phosphines functioned as pseudoenantiomers , providing their chiral 
 pyrrolines with opposite absolute configurations . 
Supplementary Material