N‐Acyl Enamines in the Paternò–Büchi Reaction: Stereoselective Preparation of 1,2‐Amino Alcohols by CC Bond Formation

Photochemical reversal of polarity of a carbonyl compound facilitates the construction of N-substituted, α,β-difunctional amino oxetanes 2 by CC bond formation. The reaction with suitable alkene substrates 1 provides the products in good yields and with excellent regio- and diastereoseiectivity. R = H, alkyl; R1 = alkyl, OrBu.