Direct Synthesis of<b><i>N</i></b>-Hydroxy<b><i>β</i></b>-Amino Acid Esters from Carboxylic Esters and Nitrones
作者:Kazuhiro Kobayashi、Takeshi Matoba、Susumu Irisawa、Atsushi Takanohashi、Miyuki Tanmatsu、Osamu Morikawa、Hisatoshi Konishi
DOI:10.1246/bcsj.73.2805
日期:2000.12
The direct synthesis of the title amino acid derivatives from carboxylic esters and nitrones can be achieved in fair to good yields when lithium or magnesium ester enolates were treated with nitrones in THF at -78 °C or in Et2O at -20 to 0 °C, respectively. The products from the reaction of t-butyl acetate with 3,4-dihydroisoquinoline N-oxide or 5,5-dimethylpyrroline 1-oxide were transformed into (1
当锂或镁酯烯醇化物在 THF 中在 -78 °C 或在 Et2O 中在 -20 到 0 °C 下用硝酮处理时,从羧酸酯和硝酮直接合成标题氨基酸衍生物可以达到相当到良好的产率,分别。乙酸叔丁酯与 3,4-二氢异喹啉 N-氧化物或 5,5-二甲基吡咯啉 1-氧化物反应的产物转化为 (1,2,3,4-四氢异喹啉-1-亚基) 乙酸酯或 (吡咯烷-2-亚基)乙酸酯衍生物在三苯基膦、四氯化碳和三乙胺的存在下,在回流的二氯甲烷中。