L-threonine aldolase in organic synthesis: Preparation of novel β-hydroxy-α-amino acids
作者:Vassil P. Vassilev、Taketo Uchiyama、Tetsuya Kajimoto、Chi-Huey Wong
DOI:10.1016/0040-4039(95)00720-w
日期:1995.6
The L-threonine aldolasefromCandidahumicola was used in the synthesis of multifunctional β-hydroxy-α-amino acids. Of many aldehydes with different substituents tested as substrates for reaction with glycine, benzyloxy- and alkoxy-aldehydes are found to be good substrates, providing a new synthetic route to α-amino-β,ω-dihydroxy and α,ω-diamino-β-hydroxy acids. The enzymatic reactions are not stereospecific
The L-and D-threonine aldolase catalyzed formation of gamma-halogenated and long-chain L-and D-3-alkylserine-derivatives 1-12, respectively, was shown starting from glycine and halogenated C-2-or C-4-C-12 aldehydes. LTA from Pseudomonas putida accepted all tested aldehydes with strongly varying diastereoselectivity (de up to 93%). Only aldehydes smaller than decanal were converted by DTA from Alcaligenes xylosoxidans with good selectivities (de up to 73%). Utilizing isobutanal enantio-and diastereopure D-syn-2-amino-3-hydroxy-4-methylpentanoic acid was obtained (ee> 99%, de> 95%), which was converted to the corresponding 2-amino-1,3-diol. (c) 2007 Elsevier Ltd. All rights reserved.
2-oxoazetidin-1-yloxy acetic acids and analogs
申请人:E. R. Squibb & Sons, Inc.
公开号:US04939253A1
公开(公告)日:1990-07-03
Antibiotic activity is exhibited by .beta.-lactams having an ##STR1## substituent (and analogs thereof) in the 1-position and an acylamino substituent in the 3-position.