1,4-Additions to γ-Aminoalkyl-Substituted α-Methylene γ-Butyrolactones: Synthesis of Highly Functionalized Amino Acid Derivatives
作者:Steffen Steurer、Joachim Podlech
DOI:10.1021/ol990672y
日期:1999.8.1
[GRAPHICS]Addition of C and O-nucleophiles to alpha-amino acid derived alpha-methylene gamma-butyrolactones led to the corresponding Michael adducts, Addition of cuprates or cyanide, respectively, could be achieved with excellent selectivities. Addition of malonate anion or methanolate could be performed with good yields, but with rather poor selectivities. Hydrogenation led to methyl-substituted lactones, and ozonolysis yielded the corresponding alpha,beta-dicarbonyis. The configuration of the products could be established by X ray crystallographic analyses and NOE experiments.