Ring Expansion versus Cyclization in 4-Oxoazetidine-2- carbaldehydes Catalyzed by Molecular Iodine: Experimental and Theoretical Study in Concert
作者:Benito Alcaide、Pedro Almendros、Gema Cabrero、Ricardo Callejo、M. Pilar Ruiz、Manuel Arnó、Luis R. Domingo
DOI:10.1002/adsc.201000171
日期:——
yield and high diastereoselectivity, through a C3C4 bondcleavage of the β‐lactamnucleus. Interestingly, in contrast to the iodine‐catalyzed reactions of 3‐alkoxy‐β‐lactam aldehydes which lead to the corresponding γ‐lactam derivatives (rearrangement adducts), the reactions of 3‐aryloxy‐β‐lactam aldehydes under similar conditions gave β‐lactam‐fused chromanes (cyclization adducts) as the sole products