2009
DOI: 10.1021/jo900376b
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Scalable Synthesis and Isolation of the Four Stereoisomers of Methyl 1-Amino-3-(4-bromophenyl)cyclopentanecarboxylate, Useful Intermediates for the Synthesis of S1P1 Receptor Agonists

Abstract: The individual isomers of methyl 1-amino-3-(4-bromophenyl)cyclopentanecarboxylate are useful intermediates for the synthesis of S1P1 receptor agonists. Herein we describe a scalable synthesis and isolation of each of the four stereoisomers of this compound in gram quantities with >98% ee and de. The utility of this approach is demonstrated by the synthesis of ((1R,3R)-1-amino-3-(4-octylphenyl)cyclopentyl)methanol in 7 steps, 11% overall yield, and >98% ee and de.

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Cited by 25 publications
(15 citation statements)
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References 23 publications
(11 reference statements)
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“…[30] From the standpoint of E Factors, a literature example involving such a 1,4-addition of a boronic acid is shown in Scheme 5. [31] Aside from the use of dimethylacetamide (DMA) and the input of external energy to achieve a reaction temperature of 140°C, the associated traditional organic-solvent-based E Factor is almost 23. By contrast, the identical reaction could be run in water at ambient temperature to afford the desired product in comparable yield and isomeric purity with an E Factor of 2.4.…”
Section: Comparisons: Micellar Catalysis In Water Versus Organic Smentioning
confidence: 99%
“…[30] From the standpoint of E Factors, a literature example involving such a 1,4-addition of a boronic acid is shown in Scheme 5. [31] Aside from the use of dimethylacetamide (DMA) and the input of external energy to achieve a reaction temperature of 140°C, the associated traditional organic-solvent-based E Factor is almost 23. By contrast, the identical reaction could be run in water at ambient temperature to afford the desired product in comparable yield and isomeric purity with an E Factor of 2.4.…”
Section: Comparisons: Micellar Catalysis In Water Versus Organic Smentioning
confidence: 99%
“…Der Rhodiumkatalysator war durch binap chelatisiert und verblieb in der wässrigen Phase 30. Um die E‐Faktoren zu vergleichen, wurde als Literaturbeispiel eine 1,4‐Addition einer Boronsäure herangezogen (Schema ) 31. Ohne das Dimethylacetamid (DMA) und den Energieaufwand für die Reaktionstemperatur von 140 °C eingerechnet, lag der E‐Faktor der herkömmlichen Reaktion mit organischen Lösungsmitteln bereits bei fast 23.…”
Section: Vergleich: Katalyse In Micellen In Wasser Gegenüber Organunclassified
“…The corresponding amino acid derivative 20 was readily generated by reaction of 19 under basic conditions. Conformationally constrained amino acids similar to 20 are known to be S1P1 receptor agonists [18a,7h] , and have been previously prepared from optically active starting materials. [18b] …”
mentioning
confidence: 99%