反应详情

A mixture of 27.7 g of the product of Step D, 150 ml of dioxane and 65 ml of 2N sodium hydroxide was refluxed for 2 hours and the mixture was cooled for crystallization of a sodium salt. The mixture was vacuum filtered and the recovered product was rinsed with a 1-1 ether-dioxane mixture and dried to obtain 16.85 g of raw sodium 2-(2-tritylamino-4-thiazolyl)-2-(1-methylethoxyimino)-acetate. 15.9 g of the said salt were dissolved in 15.9 g of dimethylformamide, 100 ml of water and 500 ml of methanol and 30 ml of 2N hydrochloric acid were added thereto. The methanol was evaporated and the mixture was diluted with water and was vacuum filtered. The recovered precipitate was rinsed and dried to obtain 9.8 g of viscous product which was taken up in 220 ml of a 1-1 methylene chloride-methanol mixture. The mixture was evaporated to dryness and the residue was taken up in ether. After efflorescence, the mixture was vacuum filtered and the recovered product was rinsed with methylene chloride and with water and dried to obtain 4.9 mg of 2-(2-tritylamino-4-thiazolyl)-2-(1-methylethoxyimino)acetic acid in the syn configuration and melting at 170° C. For analysis, 300 mg of the product were dissolved in 2 ml of methylene chloride and 1 ml of ethanol and the solution was diluted with water and methylene chloride. The mixture was stirred and vacuum filtered and the recovered crystals were rinsed with methylene chloride and water dried to obtain 230 mg of product for analysis.

1. temperaturewas refluxed for 2 hours
2. filtrationfiltered
3. washthe recovered product was rinsed with a 1-1 ether-dioxane mixture
4. customdried