Direct Enzymatic Route for the Preparation of Novel Enantiomerically Enriched Hydroxylated β-Amino Ester Stereoisomers
Abstract
:1. Introduction
2. Results and Discussion
2.1. Synthesis of hydroxy-substituted racemic β-amino esters (1R*,2S*,5S*)-(±)-4, (1S*,2S*,5S*)-(±)-5, (1S*,2S*,5S*)-(±)-6 and (1S*,2S*,5R*)-(±)-10
2.2. Enzymatic hydrolysis of hydroxy-substituted β-amino esters (1S*,2R*,5R*)-(±)-4, (1S*,2S*,5S*)-(±)-5, (1S*,2S*,5S*)-(±)-6 and (1S*,2S*,5R*)-(±)-10
Entry | Enzyme | Quantity of enzyme (mg mL-1) | Temperature (ºC.) | Solvent | Time (h) | Conv.b (%) | eeSc (%) | eePd (%) | Eb |
---|---|---|---|---|---|---|---|---|---|
1 | CAL-B | 30 | 60 | iPr2O | 48 | 37 | 48 | 82 | 16 |
2 | CAL-B | 30 | 60 | n-hexane | 48 | 24 | 18 | 58 | 4 |
3 | CAL-B | 30 | 60 | toluene | 48 | 35 | 48 | 91 | 34 |
4 | CAL-B | 30 | 60 | 1,4-dioxane | 48 | 25 | 16 | 48 | 3 |
5 | CAL-B | 30 | 60 | t-BuOMe | 48 | 45 | 75 | 91 | 48 |
6 | CAL-B | 30 | 50 | t-BuOMe | 48 | 35 | 47 | 86 | 21 |
7 | CAL-B | 30 | 40 | t-BuOMe | 48 | 36 | 46 | 81 | 15 |
8 | CAL-B | 30 | 70 | t-BuOMe | 40 | 35 | 44 | 82 | 16 |
9 | CAL-B | 50 | 60 | t-BuOMe | 40 | 40 | 53 | 81 | 16 |
10 | CAL-B | 75 | 60 | t-BuOMe | 40 | 42 | 60 | 83 | 20 |
11 | Lipase PSe | 30 | 45 | iPr2O | 48 | 22 | 10 | 35 | 2 |
12 | CAL-Ae | 30 | 45 | iPr2O | 48 | 44 | 7 | 9 | 1 |
13 | Lipase AYe | 30 | 45 | iPr2O | 48 | 11 | 2 | 16 | 1 |
14 | Lipase AKe | 30 | 45 | iPr2O | 48 | 25 | 1 | 3 | 1 |
15 | PPL | 30 | 45 | iPr2O | 48 | 20 | 5 | 20 | 2 |
Racemate | Time (days) | Conv.b (%) | Unreacted enantiomer | |||
---|---|---|---|---|---|---|
Yield (%) | Isomer | eec (%) | [α]D25 (EtOH) | |||
(1 S*,2R*,5R*)-(±)-4 | 10 | 43 | 32 | (1R,2S,5S)-4 | 68 | +34 (c 0.19) |
(1 S*,2S*,5S*)-(±)-5 | 10 | 41 | 34 | (1S,2S,5S)-5 | 78 | +16 (c 0.165) |
(1 S*,2S*,5S*)-(±)-6 | 10 | 36 | 29 | (1S,2S,5S)-6 | 54 | -4 (c 0.24) |
(1 S*,2S*,5R*)-(±)-10 | 7 | 43 | 41 | (1S,2S,5R)-10 | 90 | +100 (c 0.155) |
3. Experimental
3.1. Materials and methods
3.2. Typical small-scale enzymatic experiment
3.3. Synthesis of iodolactones tert-butyl (1R*,2S*,4S*,5S*)-4-iodo-7-oxo-6-oxabicyclo[3.2.1]octan-2-ylcarbamate [(1R*,2S*,4S*,5S*)-(±)-2] and tert-butyl (1S*,2S*,4R*,5R*)-4-iodo-7-oxo-6-oxabicyclo-[3.2.1]octan-2-ylcarbamate [(1S*,2S*,4R*,5R*)-(±)-8] [32]
3.4. Dehydroiodination reactions to obtain tert-butyl (1R*,2S*,5S*)-7-oxo-6-oxabicyclo[3.2.1]oct-3-en-2-ylcarbamate [(1R*,2S*,5S*)-(±)-3] and tert-butyl (1S*,2S*,5R*)-7-oxo-6-oxabicyclo[3.2.1]oct-3-en-2-ylcarbamate [(1S*,2S*,5R*)-(±)-9]
3.5. Lactone ring opening reaction to obtain ethyl (1R*,2S*,5S*)-2-(tert-butoxycarbonylamino)-5-hydroxycyclohex-3-enecarboxylate [(1R*,2S*,5S*)-(±)-4], ethyl (1S*,2S*,5S*)-2-(tert-butoxycarbonyl-amino)-5-hydroxycyclohex-3-enecarboxylate [(1S*,2S*,5S*)-(±)-5] and ethyl (1S*,2S*,5R*)-2-(tert-butoxycarbonylamino)-5-hydroxycyclohex-3-enecarboxylate [(1S*,2S*,5R*)-(±)-10]
3.6. Preparation of ethyl (1S*,2S*,5S*)-2-(tert-butoxycarbonylamino)-5-hydroxycyclohexanecarboxylate [(1S*,2S*,5S*)-(±)-6]
3.7. Preparative-scale resolution of (1R*,2S*,5S*)-(±)-4
3.8. Preparative-scale resolution of (1S*,2S*,5S*)-(±)-5
3.9. Preparative-scale resolution of (1S*,2S*,5S*)-(±)-6
3.10. Preparative-scale resolution of (1S*,2S*,5R*)-(±)-10
4. Conclusions
Acknowledgements
- Sample Availability: Samples of the compounds are available from the authors in mg quantities.
References and Notes
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Forró, E.; Schönstein, L.; Kiss, L.; Vega-Peñaloza, A.; Juaristi, E.; Fülöp, F. Direct Enzymatic Route for the Preparation of Novel Enantiomerically Enriched Hydroxylated β-Amino Ester Stereoisomers. Molecules 2010, 15, 3998-4010. https://doi.org/10.3390/molecules15063998
Forró E, Schönstein L, Kiss L, Vega-Peñaloza A, Juaristi E, Fülöp F. Direct Enzymatic Route for the Preparation of Novel Enantiomerically Enriched Hydroxylated β-Amino Ester Stereoisomers. Molecules. 2010; 15(6):3998-4010. https://doi.org/10.3390/molecules15063998
Chicago/Turabian StyleForró, Enikő, László Schönstein, Loránd Kiss, Alberto Vega-Peñaloza, Eusebio Juaristi, and Ferenc Fülöp. 2010. "Direct Enzymatic Route for the Preparation of Novel Enantiomerically Enriched Hydroxylated β-Amino Ester Stereoisomers" Molecules 15, no. 6: 3998-4010. https://doi.org/10.3390/molecules15063998