Synthesis
DOI: 10.1055/a-2506-0261
paper

Novel Syntheses of rac- and Enantiomerically Enriched Dimethyl α-Methylphosphoserinate

Estefany Bello-Vargas
a   Centro de Investigaciones Químicas­IICBA, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, 62209 Cuernavaca, Morelos, México
,
a   Centro de Investigaciones Químicas­IICBA, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, 62209 Cuernavaca, Morelos, México
,
Ivan Romero-Estudillo
a   Centro de Investigaciones Químicas­IICBA, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, 62209 Cuernavaca, Morelos, México
b   CONAHCYT-Centro de Investigaciones Químicas-IICBA, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, 62209 Cuernavaca, Morelos, México
,
Victoria Labastida-Galván
a   Centro de Investigaciones Químicas­IICBA, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, 62209 Cuernavaca, Morelos, México
› Author Affiliations
The authors thank the Consejo Nacional de Humanidades, Ciencias y Tecnologías (CONAHCYT) for financial support (Projects 286614, 140607). E. B.-V. would like to thank CONAHCYT for a graduate scholarship (884123).


Abstract

The novel synthesis of racemic and enantiomerically enriched dimethyl (S)- and (R)-α-methylphosphoserinate is described. The racemic synthesis involves a three-component reaction of hydroxyacetone, benzylamine, dimethyl phosphite and catalytic amounts of phenylphosphonic acid, or alternatively, the reaction of ethyl pyruvate with NH4OAc and dimethyl phosphite in the presence of SiO2 under solvent-free conditions, followed by reduction of the ethyl ester with NaBH4 in THF/MeOH. On the other hand, the stereoselective synthesis includes the phosphonylation of chiral cyclic imines obtained by reaction of ethyl pyruvate with (S)- or (R)-phenylglycinol, followed by reduction of the cyclic ester with NaBH4 and cleavage of the phenylglycinol fragment under hydrogenolysis. The absolute configuration is established by 2D NOESY experiments. All synthesized compounds are fully characterized.

Supporting Information



Publication History

Received: 04 December 2024

Accepted after revision: 18 December 2024

Accepted Manuscript online:
18 December 2024

Article published online:
11 February 2025

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