diastereoselectivities (>95:5) via a DABCO‐mediated [2+1] annulation. Utilization of enantiomericallypurecinchonaalkaloid derivatives enables the first asymmetric ammonium ylide mediated method to provide (3R , 4R )‐β,γ ‐disubstituted and (2R , 3R, 4R )‐α,β,γ ‐trisubstituted γ ‐butyrolactones in moderate to good yields with up to very good enantiomeric ratios (97:3). The scalability of the transformation