Synthesis 2024; 56(05): 871-877
DOI: 10.1055/a-2211-2343
paper

Stereodivergent Synthesis of rac-cis- and rac-trans-4-Hydroxyphosphopipecolic Acids

Juan Carlos Morales-Solís
a   Centro de Investigaciones Químicas-IICBA, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Cuernavaca, Morelos 62209, Mexico
,
a   Centro de Investigaciones Químicas-IICBA, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Cuernavaca, Morelos 62209, Mexico
,
Rubén Oswaldo Argüello-Velasco
b   Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Cuernavaca, Morelos 62209, Mexico
,
José Luis Viveros-Ceballos
a   Centro de Investigaciones Químicas-IICBA, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Cuernavaca, Morelos 62209, Mexico
,
Victoria Labastida-Galván
a   Centro de Investigaciones Químicas-IICBA, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Cuernavaca, Morelos 62209, Mexico
› Author Affiliations
The authors thank the Consejo Nacional de Humanidades, Ciencias y Tecnologías (CONAHCYT) for financial support through projects 286614, 140607, and 807. J.C.M.-S. also wishes to thank CONAHCYT for Graduate Scholarship 1004402.


Abstract

We report herein the first stereodivergent synthesis of rac-cis- and rac-trans-4-hydroxyphosphopipecolic acids. The main feature of this methodology is the controlled cis or trans reduction of 4-oxophosphopipecolates by exclusively varying the size of the hydride reagents. Thus, a small hydride reagent (NaBH4) adds selectively from the axial side of the carbonyl group to give the equatorial hydroxyl group (cis-product), whereas a bulky hydride reagent such as LiBH(sec-Bu)3 (L-Selectride®) preferentially attacks from the equatorial side, giving the hydroxyl group in the axial position (trans-product). In the last step, hydrolysis of the diethyl phosphonate and ethyl phenylphosphinate groups with bromotrimethylsilane, followed by methanolysis, led to the target compounds.

Supporting Information



Publication History

Received: 11 October 2023

Accepted: 15 November 2023

Accepted Manuscript online:
15 November 2023

Article published online:
02 January 2024

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