Two separate and distinct syntheses of stereospecifically deuteriated samples of (2S)-proline
作者:Paul Barraclough、Petra Dieterich、Caroline A. Spray、Douglas W. Young
DOI:10.1039/b601097k
日期:——
were then converted into (2S,3S)-[3-(2)H1]- and (2S,3R)-[2,3-(2)H2]-proline, 1a and 1b respectively. The second synthesis provides (2S)-[3,3-(2)H2]-, (2S,3S)- and (2S,3R)-[3-(2)H1]-proline, 1d, 1a and 1c respectively, and has as its key step the highly stereoselective hydrolysis of the silylenol ethers 14 and 14a respectively in which deuteriation or protonation occurs from the re-face of the enol ether
报道了在β-碳原子上立体定向氘化的氨基酸L-脯氨酸样品的两种不同的合成。在这些方法中的第一方法中,通过化学-酶促合成制备的标记的重氮酮6已经在碱性条件下被光解,以通过水解和分子内捕集所得的烯酮中间体9而得到相应的标记的焦谷氨酸甲酯10。然后将它们转化为(2S,3S)-[3-(2)H1]-和(2S,3R)-[2,3-(2)H2]-脯氨酸,分别为1a和1b。第二种合成分别提供(2S)-[3,3-(2)H2]-,(2S,3S)-和(2S,3R)-[3-(2)H1]-脯氨酸,1d,1a和1c ,并且是关键步骤的甲硅烷基醚14和14a的高度立体选择性水解,其中从烯醇醚的表面发生氘化或质子化。