反应 #5257
ord-80f62c1c46ba4eb9a6ba6a91577ca2ab
反应方程式
反应物
试剂
反应条件
后处理
- 1其他were reacted
- 2其他to obtain 27.1 g of raw product
- 3其他precipitation
- 4过滤filtered
- 5洗涤the product was rinsed with acetic acid, acetone
- 6其他ether to obtain 4.6 of product
- 7过滤vacuum filtered
- 8洗涤The product was rinsed with water, acetone
实验过程
Using the procedure of Step A of Example 8, 27.2 g of 7-amino-cephalosporanic acid, 128 ml of the etherate of boron trifluoride, 126 ml of benzyl alcohol and 90 ml of triethylamine were reacted to obtain 27.1 g of raw product. 25 g of the said product and 250 ml of acetic acid were added to 25 ml of the etherate of boron trifluoride followed by the addition of 25 ml of triethylamine which caused precipitation. The mixture was vacuum filtered and the product was rinsed with acetic acid, acetone and then ether to obtain 4.6 of product. 4.8 g of the said product were dissolved at 45° C. in 20 ml of 2N hydrochloric acid and 8 ml of concentrated hydrochloric acid and the solution was treated with activated carbon. 6 ml of ammonium hydroxide were added to the mixture which was then vacuum filtered. The product was rinsed with water, acetone and then ether to obtain 2 g of 3-benzyloxy-7-amino-ceph-3-eme-4-carboxylic acid.