Реакция #348437

Уравнение реакции

2,2,2,-Trichloroethyl 3-bromo-3-methyl-7-(2-phenylacetamido)cepham-4-carboxylate

aniline

→

2,2,2-trichloroethyl 2-anilinomethyl-2-methyl-6-(2-phenylacetamido)penam-3-carboxylate

Выход 48.0%

Растворители

methylene chloride

Условия реакции

Обработка

1. 1
   Температураcooling
2. 2
   workup.STIRRINGthe mixture was stirred for 4 hours at the same temperature
3. 3
   Фильтрацияthe reaction mixture was filtered
4. 4
   ПромывкаThe filtrate was washed with a dilute aqueour solution of phosphoric acid
5. 5
   Сушкаwith water, dried over magnesium sulfate
6. 6
   Концентрированиеconcentrated
7. 7
   Промывкаeluted with chloroform
8. 8
   ДругоеThe eluate was separated into fractions of each about 20 ml
9. 9
   Другоеthe second to eighth fractions were collected
10. 10
    workup.DISTILLATIONthe solvent was distilled off

Методика

2,2,2,-Trichloroethyl 3-bromo-3-methyl-7-(2-phenylacetamido)cepham-4-carboxylate (1.10 g) was dissolved in methylene chloride (15 ml) and to this solution was added aniline (0.28 g). And to the solution was added silver fluoroborate (0.45 g) under stirring under ice-cooling and the mixture was stirred for 4 hours at the same temperature. After the reaction was completed, the reaction mixture was filtered. The filtrate was washed with a dilute aqueour solution of phosphoric acid and then with water, dried over magnesium sulfate and concentrated. The residue was subjected to column chromatography on silica gel (25 g) and eluted with chloroform. The eluate was separated into fractions of each about 20 ml and the second to eighth fractions were collected and then the solvent was distilled off to give 2,2,2-trichloroethyl 2-anilinomethyl-2-methyl-6-(2-phenylacetamido)penam-3-carboxylate (0.54 g), mp 148° to 149° C.

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