Biosynthesis of porphyrins and related macrocycles. Part 52. Synthesis of (11-S )-[11-2H1]porphobilinogen and the (11R)-enantiomer for stereochemical studies on hydroxymethylbilane synthase (porphobilinogen deaminase)
作者:Werner L. Neidhart、Paul C. Anderson、Graham J. Hart、Alan R. Battersby
DOI:10.1039/a904262h
日期:——
A synthetic route is devised for the synthesis of (11S)-[11-2H1]porphobilinogen 1a and of the (11R)-enantiomer 1b. Their absolute configurations and enantiomeric purity are established by degradation to a derivative of [2-2H1]glycine of known stereochemistry. Methods are then developed, based on the synthesis of chiral imidate esters, for determination of the configuration of [2H1]-labelled aminomethylpyrroles
合成路线被设计用于合成(11小号) - [11- 2 ħ 1 ]胆色素原1a和(11 - [R )-对映体1B。通过降解为已知立体化学的[2- 2 H 1 ]甘氨酸的衍生物,可以确定它们的绝对构型和对映体纯度。然后,基于手性亚氨酸酯的合成,开发了通过将[ 2 H 1 ]标记的氨基甲基吡咯转化为[ 2 H 1 ]标记的am,然后使用1进行分析的方法,来确定[ 2 H 1 ]标记的氨基甲基吡咯的构型。1 H-NMR。PBG 1a和1b的标记样品用作羟甲基胆烷合酶的底物,产物被捕获为[ 2 H 1 ]标记的氨基甲基胆碱7c和7d。它们的构型通过NMR测定法确定,以证明当PBG 1被酶促转化为氨基甲基胆烷7时,在氨基甲基碳上总体上保留了构型。