反応 #978103

反応方程式

4-iodobenzylbromide

glucosamine hydrochloride

diisopropylethylamine

→

4-iodobenzyl glucosamine

収率 9.4%

溶媒

DMF

DMF

反応条件

後処理

1. 1
   その他the precipitated solid was removed from the supernatant
2. 2
   その他by decanting
3. 3
   その他Volatiles were removed from the supernatant
4. 4
   その他the resulting residue was separated on a si-gel column

実験手順

Thus, a slurry of glucosamine hydrochloride (0.7 g) and diisopropylethylamine (0.6 mL) in DMF (2.0 mL) was stirred at 80° C. for 30 minutes. A solution of 4-iodobenzylbromide (0.4 g) in DMF (2 mL) was added to the reaction mixture, and the resulting mixture stirred for 18 hours. After the reaction mixture was cooled to room temperature, the precipitated solid was removed from the supernatant by decanting. Volatiles were removed from the supernatant, and the resulting residue was separated on a si-gel column using 10% aqueous MeCN as the eluent to yield 50 mg of pure 4-iodobenzyl glucosamine (compound TP012 in the scheme above). The purity of 4-iodobenzyl bromide, which can vary greatly from batch to batch if obtained from commercial suppliers, will affect the yields of this reaction accordingly. The compound 4-Iodobenzyl galactosamine can be prepared using a similar reaction scheme, starting from galactosamine hydrochloride and iodobenzyl bromide.

出典