Selective Michael−Aldol Reaction by Use of Sterically Hindered Aluminum Aryloxides as Lewis Acids: An Easy Approach to Cyclobutane Amino Acids
作者:Alberto Avenoza、Jesús H. Busto、Noelia Canal、Jesús M. Peregrina、Marta Pérez-Fernández
DOI:10.1021/ol0514707
日期:2005.8.1
cycloaddition of 2-amidoacrylates with monosubstituted donor olefins, including its asymmetric version, is described. The stereoselectivity of this reaction can be modulated by the use of stericallyhindered aluminum aryloxides or methylaluminoxane as Lewis acids. The reaction was applied to the synthesis of both stereoisomers of 2-benzyloxycyclobutane-alpha-amino acid, which are protected serine analogues c(4)Ser(OBn)