Reaktion #476562

Reaktionsgleichung

D-serine

ammonium chloride

trityl chloride

hexamethyldisilazane

→

titled product

N-trityl-D-serine

Lösungsmittel

dichloromethane

methanol

dichloromethane

methanol

Triethylamine

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigeto form a suspension
2. 2
   TemperaturThe reaction mixture was refluxed at 35° C. to 40° C. for 3 hours
3. 3
   Sonstigeto reach at room temperature
4. 4
   workup.ADDITIONwas added at ambient temperature in 10-15 minutes
5. 5
   Sonstigethe solvent was recovered under vacuum at 40° C. to 45° C
6. 6
   workup.ADDITIONToluene (400 ml) and 5% citric acid solution (750 ml) was added to the recovered solid
7. 7
   Filtrationfiltered
8. 8
   SonstigeThe solid product obtained
9. 9
   Waschenwas washed with water (750 ml) and hexanes (200 ml)
10. 10
    Filtrationfiltered
11. 11
    WaschenThe filtered solid was washed with toluene (200 ml)
12. 12
    Sonstigedried

Vorschrift

To dichloromethane (400 ml), D-serine (50 g) was added at ambient temperature under nitrogen atmosphere to form a suspension and then hexamethyldisilazane (134.15 ml) was added to the suspension in 10-15 minutes at ambient temperature. Catalytic amount of ammonium chloride (1 gm) was added. The reaction mixture was refluxed at 35° C. to 40° C. for 3 hours and then it was cooled to 0° C. To this mixture, a solution of anhydrous methanol (22.83 g) in dichloromethane (50 ml) was added at 0° C. and the mixture was allowed to reach at room temperature. Triethylamine (48.14 g) was slowly added to it at 25° C. to 30° C. and then trityl chloride (132.63 g) was added in 3 lots to the mixture at an interval of 10 minutes. The reaction mixture was then stirred for overnight under nitrogen at ambient temperature. After completion of the reaction, methanol (76.12 g) was added at ambient temperature in 10-15 minutes and the solvent was recovered under vacuum at 40° C. to 45° C. Toluene (400 ml) and 5% citric acid solution (750 ml) was added to the recovered solid and filtered. The solid product obtained was washed with water (750 ml) and hexanes (200 ml) and then filtered. The filtered solid was washed with toluene (200 ml) and dried to obtain the titled product. Yield=100 gm; Mass: (−EI): 346 (M−1); 242.9 (−Tr).

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