Method of preparing optically active .alpha.-amino acids and
申请人:Degussa Aktiengesellschaft
公开号:US06018050A1
公开(公告)日:2000-01-25
The invention relates to a new process for the preparation of optically active amino acids and amino acid derivatives of the general formula (I), wherein *, X and R.sup.1 to R.sup.4 have the meaning given in the description. Starting from commercially obtainable (-)-menthol or (+)-menthol, the enantiomerically pure compounds of the formula (I) are obtained in high yields. The method is particularly suitable for the preparation of sterically demanding amino acids and amino acid derivatives.
Total synthesis of 3,4-dihydroxyprolines, d-threo-l-norvaline and (2S,3R,4R)-2-amino-3,4-dihydroxytetrahydrofuran-2-carboxylic acid methyl ester
作者:Raquel G. Soengas、Juan C. Estévez、Ramón J. Estévez
DOI:10.1016/j.tetasy.2003.10.005
日期:2003.12
The Henry reaction between D-glyceraldehyde and ethyl nitroacetate allowed the practical development of a diastereoselective synthesis of 3,4,5-trihydroxy-2-nitropentanoic acid esters, which were reduced to polyoxamic acids, which were used in a new diastereoselective synthesis of 3,4-dihydroxyprolines and new enantioselective syntheses Of D-threo-L-norvaline and (2S,3R,4R)-2-amino-3,4-dihydroxytetrahydrofuran-2-carboxylic acid methyl ester. (C) 2003 Elsevier Ltd. All rights reserved.
Stereoselective Synthesis of 4,5-Dihydroxy-D-erythro- and 4,5-Dihydroxy-D-threo-L-norvaline from D-Ribonolactone
作者:Jesús Ariza、Miguel Díaz、Josep Font、Rosa M. Ortuño
DOI:10.1016/s0040-4020(01)85821-x
日期:1993.2
Nitrogen functions have been introduced stereoselectively at the C-2 position in D-ribonolactone derivatives in order to prepare the title unnatural amino acids. The synthetic strategies lie in the inversion of configuration in SN2-type substitution reactions and stereospecific hydrogenation of conveniently substituted butenolides. The -isomer is the key precursor in the synthesis of the antibiotic
为了制备标题非天然氨基酸,已经在D-核糖内酯衍生物的C-2位立体选择性地引入了氮功能。合成策略在于S N 2型取代反应中构型的反转和便利取代的丁烯内酯的立体定向氢化。的异构体是在抗生素clavalanine的合成中的关键前体。
An efficient and concise entry to (-)-4,5-dihydroxy----norvaline. Formal synthesis of clavalanine.
作者:Jesus Ariza、Josep Font、Rosa M. Ortuño
DOI:10.1016/0040-4039(91)85018-z
日期:1991.4
The title amino acid (2) has been synthesized for the first time in a seven-step sequence from -ribonolactone, in 20% overall yield. Since the -carbamoyl derivative of (2) in itsγ-lactone form has been used to prepare clavalanine, a formal total synthesis of this antibiotic is derived.