Enantioselective Syntheses of (R)- and (S)-Hexahydropyridazine-3-carboxylic Acid Derivatives
作者:Ulrich Schmidt、Christine Braun、Heinz Sutoris
DOI:10.1055/s-1996-4192
日期:1996.2
Appropriately protected optically active tetrahydropyridazine-3-carboxylic acid and hexahydropyridazine-3-carboxylic acid were prepared via ring closure of α-hydrazino- and δ-hydrazinopentanoates. Either optically active glutamic acid or an enantioselective catalytic hydrogenation was used to generate the chiral center. The numerous optically active intermediates are valuable starting materials for the synthesis of other unusual amino acids.
通过δ-肼和δ-肼戊酸酯的闭环反应,制备了适当保护的光学活性四氢哒嗪-3-羧酸和六氢哒嗪-3-羧酸。光学活性谷氨酸或对映体选择性催化加氢均可用于生成手性中心。这些具有光学活性的中间体是合成其他不常见氨基酸的宝贵起始原料。