Asymmetric Synthesis of Aliphatic α-Amino and γ-Hydroxy α-Amino Acids and Introduction of a Template for Crystallization-Induced Asymmetric Transformation
The asymmetric synthesis of aliphatic α-amino and γ-hy]droxy α-amino acids is described. The key step is an aza-Michael addition controlled by crystallization-induced asymmetrictransformation (CIAT), affording excellent diastereomeric ratios (dr ≥96:4). Consecutive deoxygenation or stereoselective reduction (dr 99:1) furnish various α-amino and γ-hydroxy α-amino acids, respectively.