تفاعل #428941

معادلة التفاعل

Cysteine HCl

benzyl chloroformate

HCl

→

N,S-diCBZ-cysteine

المردود 80.0%

المذيبات

NaOH

NaOH

ظروف التفاعل

المعالجة

1. 1
   أخرىto form a colorless syrup
2. 2
   أخرىThe aqueous solution was decanted
3. 3
   أخرىthe sticky syrup was triturated with petroleum ether (100 ml×3)

الإجراء التجريبي

Cysteine HCl (2.0 g, 12.6 mmol) was dissolved in 2N NaOH and benzyl chloroformate (4.5 mL) was slowly added over 15 min. The pH value of the solution was kept at 9-10 by addition of 2 N NaOH (~7 mL) at 0° C. After vigorous stirring for 1 h at 0° C., the aqueous solution was acidified with 2N HCl at pH ~2 to form a colorless syrup. The aqueous solution was decanted and the sticky syrup was triturated with petroleum ether (100 ml×3) to give N,S-diCBZ-cysteine (3.94 g, 80%) as a white solid. Analytically pure sample could also be obtained by flash chromatography (on silica gel, 5% CH3OH in EtOAc):mp.93°-94° C.; 1H NMR (CDCl3) δ7.33 (10H, m), 5.67 (1H, d, J=7.7 Hz), 5.21 (2H, s), 5.12 (2H, s), 4.66 (1H, ddd, J=7.7, 6.7, 4.4 Hz), 3.31 (1H, dd, J=6.7, 14.5 Hz).

المصدر