stereoselective Diels–Alderreactions with olefinic azlactones by asymmetric trienamine catalysis. The obtained cycloadducts are easily transformed into the corresponding cyclic α,α‐disubstituted N‐protected amino acid methyl esters under mild reaction conditions. Furthermore, it is demonstrated that in situ ligation of the crude cycloaddition products with amino acid hydrochloride salts leads to the