Studies on the biosynthesis of β-lactam antibiotics. Part I. Stereospecific syntheses of (2RS,3S)-[4,4,4-<sup>2</sup>H<sub>3</sub>]-, (2RS,3S)-[4-<sup>3</sup>H]-, (2RS,3R)-[4-<sup>3</sup>H]-, and (2RS,3S)-[4-<sup>13</sup>C]-valine. Incorporation of (2RS,3S)-[4-<sup>13</sup>C]-valine into penicillin V
作者:D. John Aberhart、Lawrence J. Lin
DOI:10.1039/p19740002320
日期:——
studies on the enzymatically resolved valine and its acetate established the stereochemical homogeneity of the labelling. (2RS,3S)-[4-13C]- and (2RS,3S)-[4-3H]-Valine were synthesized by the same route, by using [13C]methyl-lithium and [3H]methyl-lithium respectively. Similarly, (2RS,3R)-[4-3H]valine was synthesized from (2S,3R)-trans-2,3-epoxybutyric acid.
描述了标题化合物的合成。(-)-(2 R,3 S)-反式-2,3-环氧丁酸被酯化并还原为(2 R,3 S)-反式-2,3-环氧丁-1-醇,并用碘化锂-游离的[ 2 H 3 ]甲基-锂得到(2 R,3 S)-3-甲基[4,4,4- 2 H 3 ]丁烷-1,2-二醇。用偏高碘酸钠处理得到[3,3,3- 2 H 3 ]-异丁醛(未分离),将其转化为氨基腈,然后转化为(2 RS,3 S)-[4,4,4-2 H 3 ]缬氨酸。对酶解缬氨酸及其乙酸盐的Nmr研究建立了标记的立体化学均一性。(2个RS,3小号) - [4- 13 C] -和(2个RS,3小号) - [4- 3 H] -缬氨酸分别通过相同的途径合成,通过使用[ 13 C]甲基锂和[ 3 H]甲基锂。类似地,由(2 S,3 R)-反式-2,3-环氧丁酸合成(2 RS,3 R)-[4- 3 H]缬氨酸。