Synthesis of (2R)- and (2S)- [1-13C]-2-amino-2-methylmalonic acid: Chiral substrates for serine hydroxymethyltransferase
作者:Neil R. Thomas、David Gani
DOI:10.1016/s0040-4020(01)90505-8
日期:1991.1
(2R) - and (2S)-[1-13C]-2-amino-2-methylmalonate, probes for the stereochemical course of the serine hydroxymethyltransferase reaction, have been synthesised from bis-lactim ethers derived from valine and alanine. Direct acylation of the anion with diethyl carbonate gave the N-ethoxycarbonyl derivative rather than the required ethyl ester. The 13C-labelled carboxyl group was therefore Introduced via
(2R) -和(2S) - [1- 13 C] -2-氨基-2-甲基丙,对于丝氨酸羟甲基反应的立体化学过程探针,已经从合成双-lactim醚类从缬氨酸和丙氨酸的。用碳酸二乙酯直接将阴离子酰化,得到N-乙氧羰基衍生物,而不是所需的乙酯。在13因此C标记的羧基基团被引入通过治疗的阴离子的与[1- 13 C] -乙酰氯,接着卤仿氧化。将得到的羧酸盐,然后用甲基碘酯化,和双在酸性条件下裂解-内酰胺醚环系统,得到氨基酸酯。皂化,然后通过阳离子交换色谱分离,得到标题化合物。