N-CARBOBENZOXY-L-SERINE BETA-LACTONE Chemical Properties

Melting point:

129-130°C

Boiling point:

425.5±44.0 °C(Predicted)

Density 

1.31±0.1 g/cm3(Predicted)

refractive index 

-25.5 ° (C=1, CH3CN)

storage temp. 

Inert atmosphere,2-8°C

solubility 

Acetonitrile (Sparingly, Sonicated), Chloroform (Slightly), Methanol (Slightly)

pka

10.32±0.20(Predicted)

form 

powder to crystal

color 

White to Almost white

optical activity

-24.401° (C=1.00 g/100ml, ACN)

InChIKey

CWFZPRQDHIUBDO-VIFPVBQESA-N

Safety Information

HS Code 

2932.20.4500

N-CARBOBENZOXY-L-SERINE BETA-LACTONE Usage And Synthesis

Chemical Properties

White Foam

Uses

N-Carbobenzyloxy-L-serine β-Lactone (cas# 26054-60-4) is a compound useful in organic synthesis.

Application

N-Carbobenzyloxy-L-serine β-Lactone is a reagent for the synthesis of β-substituted alanines.

Synthesis

General procedure for the synthesis of benzyl (S)-(2-oxooxetan-3-yl)carbamate from N-benzyloxycarbonyl-L-serine: Step 4-1. Synthesis of Z-serine-β-lactone (AA4-2). This intermediate was prepared in a similar way to the previously described synthesis of the Boc derivative AA3-1. Triphenylphosphine (4.5 g, 17.1 mmol, 1.1 eq.) was added to a dry 250 mL three-necked flask (equipped with a mechanical stirrer) under nitrogen protection, followed by the addition of 100 mL of a solvent mixture of anhydrous THF and CH3CN (1:9, v/v). The mixture was stirred until completely dissolved, then cooled to -55 °C (bath temperature) and dimethyl azodicarboxylate (DMAD, 1.9 mL, 17.1 mmol, 1.1 eq.) was added dropwise over 10 min. After addition, stirring was continued for 20 min, and then Z-Ser-OH (AA4-1, 3.7 g, 15.5 mmol, 1.0 eq.) dissolved in 50 mL of anhydrous THF mixed with CH3CN solvent (1:9, v/v) was added dropwise over 30 min. The reaction mixture was stirred at -55 °C for 1.5 h. After removing the cooling bath, the reaction system was allowed to slowly warm up to room temperature. After the reaction mixture reached room temperature, the solvent was removed by concentration under reduced pressure. The resulting yellow oil was purified by fast chromatography [elution gradient: hexane/EtOAc (80:20) to (60:40)] to give 2.5 g of AA4-2 as a white solid in 72% yield. Purification of the crude product is recommended to be carried out on the same day to avoid decomposition. DCM can be added if necessary to help dissolve the residue.TLC conditions: hexane/EtOAc (60:40), Rf = 0.55 (UV, CMA).

storage

N-Carbobenzyloxy-L-serine β-Lactone is stable for many months at 4 °C in dry form. Neutral or slightly acidic solutions of N-Carbobenzyloxy-L-serine β-Lactone is stable for at least 1 day.

References

[1] Bioorganic and Medicinal Chemistry Letters, 1996, vol. 6, # 22, p. 2643 - 2646
[2] Patent: US2010/93720, 2010, A1. Location in patent: Page/Page column 38
[3] Journal of the American Chemical Society, 1985, vol. 107, # 24, p. 7105 - 7109
[4] Organic and Biomolecular Chemistry, 2008, vol. 6, # 18, p. 3240 - 3243
[5] Organic Syntheses, 1992, vol. 70, p. 1 - 1

N-CARBOBENZOXY-L-SERINE BETA-LACTONE(26054-60-4)Related Product Information

• N-CARBOBENZOXY-DL-ASPARTIC ACID
• N-Carbobenzyloxyglycine
• N-Carbobenzyloxy-D-asparagine
• N-CARBOBENZOXY-DL-SERINE
• N-CARBOBENZOXY-DL-VALINE
• N-Cbz-L-serine methyl ester
• N-ALPHA-CARBOBENZOXY-L-SERINE T-BUTYL ESTER
• L-1-Phenylethylamine
• N-Cbz-L-Serine
• 2-Oxetanone
• 3-OXETANAMINE
• N-CARBOBENZOXY-L-SERINE BETA-LACTONE