Acetyl chloride → 2-(2-Pyridyloxy)acetyl chloride

To a mixture of 2-(2-pyridyloxy)acetic acid hydrochloride (1.5 g) and acetyl chloride (8 ml) was added at -30° C. phosphorus pentachloride (3.3 g), and the mixture was stirred at room temperature for 18 hours. Precipitated crystals were collected by filtration and washed with a small amount of acetyl chloride and diethyl ether and dried to give 2-(2-pyridyloxy)acetyl chloride (1.3 g). A mixture of 7-(D-2-phenylglycinamido)-3-methyl-3-cephem-4-carboxylic acid (2.5 g) and trimethylsilylacetamide (0.0288 mole) in methylene chloride (70 ml) was stirred for 1.5 hours. The solution was cooled to 3° C. and the above obtained 2-(2-Pyridyloxy)acetyl chloride was added thereto. The resultant mixture was stirred under ice-cooling for 2 hours and concentrated. To the residue was added ice-water and the resultant powder was filtrated and washed with acetone containing water and acetone in turn to give powder (1.4 g). The filtrate and washings were collected together and extracted with ethyl acetate four times. The ethyl acetate extracts were washed with water, dried and concentrated to give powder (0.4 g). Thus obtained powders (1.4 g) and (0.4 g) were combined together and recrystallized from methanol to give crystals (0.9 g) of 7-{D-2-[2-(2-pyridyloxy)acetamido]-2-phenylacetamido}-3-methyl-3-cephem-4-carboxylic acid, mp 209° to 211° C. (dec).

1. customPrecipitated crystals
2. filtrationwere collected by filtration
3. washwashed with a small amount of acetyl chloride and diethyl ether
4. customdried

ORD 기록

ord-ee18a8c11a42427d9f3538a97b42e2b7

출처 데이터셋

uspto-grants-1979_10

DOI

10.6084/m9.figshare.5104873.v1

특허 번호

US04172198