Asymmetric Alkylations of a Sultam-Derived Glycine Equivalent: Practical preparation of enantiomerically pure ?-amino acids
作者:Wolfgang Oppolzer、Robert Moretti、Changyou Zhou
DOI:10.1002/hlca.19940770823
日期:1994.12.14
products 3. Acidic hydrolysis of the pure products 3 gives (aminoacyl)sultams 4 which by mild saponification furnish pureα-aminoacids 5 in good overall yields from 2, along with recovered auxiliary 1 (Scheme 1). Pure ω-protected α,ω-diamino acids and α-amino-ω-(hydroxyamino)acids 12–16 are readily accessible from (ω-haloacyl)sultams 3via reaction with N-nucleophiles followed by acidic and basic hydrolyses
作者:Yoshikazu Isowa、Toshiyuki Takashima、Muneki Ohmori、Hideaki Kurita、Masanari Sato、Kaoru Mori
DOI:10.1246/bcsj.45.1461
日期:1972.5
Nδ-Tosyl-Nδ-benzyloxy-Dl-ornithine was synthesized starting from γ-(N-tosyl-N-benzyloxy)-aminopropyl bromide and diethyl acetamidomalonate and resolved enzymatically to give the l- and d-isomers. Removal of one or both of protecting groups gave Nδ-benzyloxyornithine or Nδ-hydroxyornithine. The reduction product of Nδ-hydroxy-l-ornithine was identical with authentic l-ornithine.