Asymmetric synthesis of cycloaliphatic α-amino acids with a norbornane skeleton
作者:Carlos Cativiela、Pilar López、JoséA. Mayoral
DOI:10.1016/0957-4166(90)90038-c
日期:1990.1
The asymmetric synthesis of endo and exo 2-aminonorbornane-2-carboxylic acids is carried out via the Diels-Alderreaction between cyclopentadiene and (−)-menthyl N-acetyl-α,β-dehydroalaninate. It is shown that this dienophile is more reactive than the corresponding methyl ester, which opens the way for the use of chiral N-acetyl-α,β-dehydroalaninates as dienophiles in asymmetricDiels-Alder reactions
The Diels-Alderreaction of N-acyl-α,β-dehydroalanine esters with cyclopentadiene afforded a mixture of the stereoisomers of acylaminonorbornene-2-carboxylic acid esters in good yields.
N-Fmoc-dehydroalanine: a versatile molecular scaffold for the rapid solid-phase synthesis of cycloaliphatic amino acids
作者:Brendan A Burkett、Christina L.L Chai
DOI:10.1016/s0040-4039(00)01113-8
日期:2000.8
The synthesis of polymer-supported N-Fmoc-dehydroalanine starting from S-protected cysteine via an oxidation/elimination strategy is described. Cycloaddition with a range of dienes afforded a range of conformationally constrained amino acids in moderate yields. The potential applications of this methodology to combinatorial libraries is discussed.