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ChemicalBook CAS DataBase List Cefotaxime Impurity 39
66341-09-1

Cefotaxime Impurity 39 synthesis

1synthesis methods
69689-85-6 Synthesis
(E)-Ethyl 2-(2-Aminothiazol-4-yl)-2-(methoxyimino)acetate Hydrobromide

69689-85-6
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Yield:-

Reaction Conditions:

in sodium hydroxide;water

Steps:

9.8 Preparation 9
(8) Ethyl 2-methoxyimino-2-(2-amino-1,3-thiazol-4-yl)acetate hydrobromide (anti isomer) (15.5 g.) was dissolved in a solution of sodium hydroxide (4.4 g.) in water (150 ml.) and the resulting solution was stirred for 1 hour at ambient temperature. An insoluble material was filtered off and the filtrate was adjusted to pH 5.0 to precipitate crystals. The crystals were collected by filtration and dried to give 2-methoxyimino-2-(2-amino-1,3-thiazol-4-yl)acetic acid (anti isomer) (8.0 g.). I.R. spectrum (Nujol) 3150, 1655, 1595, 1550 cm-1

References:

Fujisawa Pharmaceutical Co., Ltd. US4279818, 1981, A

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