A New Synthetic Method for the Preparation of<i>α</i>,<i>β</i>-Didehydroamino Acid Derivatives by Means of a Wittig-Type Reaction. Syntheses of (2<i>S</i>, 4<i>S</i>)- and (2<i>R</i>, 4<i>R</i>)-4-Hydroxyprolines
作者:Rumi Kimura、Tanemasa Nagano、Hideki Kinoshita
DOI:10.1246/bcsj.75.2517
日期:2002.11
acid derivatives with high (Z)-selectivity in good yields. Moreover, ethyl (4S)- and (4R)-2-(N-Boc-amino)-4,5-isopropylidenedioxy-2-pentenoates prepared by the present method were converted to (2S, 4S)- and (2R, 4R)-4-hydroxyprolines, respectively.
在三丁基膦和碱的存在下,N-Boc-和NZ-α-甲苯磺酰基甘氨酸乙酯与各种醛反应,以良好的产率提供相应的α,β-二脱氢氨基酸衍生物,具有高(Z)选择性。此外,通过本方法制备的(4S)-和(4R)-2-(N-Boc-氨基)-4,5-异亚丙基二氧基-2-戊烯酸乙酯转化为(2S, 4S)-和(2R, 4R) )-4-羟脯氨酸,分别。